522 results on '"Qin, Qin"'
Search Results
2. Fabrication of Bi2O3/In2O3 p-n heterojunction with enhanced photocatalytic activity by efficient interfacial charge transfer
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Qin Qin, Tian Xiao, and Xiaodong Zhu
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In2O3 ,Bi2O3 ,P-n heterojunction ,Internal electric field ,Photocatalytic activity ,Chemistry ,QD1-999 - Abstract
Facilitating the separation of photogenerated charges is a crucial process in photocatalytic degradation of pollutants. In this study, Bi2O3/In2O3 composites were prepared using a co-precipitation method and subsequently calcined at 400 ℃ for 1 h. The Mott-Schottky curves confirmed a p(Bi2O3)-n(In2O3) heterojunction was yielded. Due to the significant difference in Fermi levels between Bi2O3 and In2O3, an internal electric field was established at the interface, with field lines directed from In2O3 to Bi2O3. Under illumination, the excited electrons accumulated in the conduction band (CB) of In2O3, while holes gathered in the valence band (VB) of Bi2O3, promoting charge separation and enhancing quantum efficiency. The composite material exhibited the highest photocatalytic activity when the atomic percentage of Bi to In was 1:1, with the first-order reaction rate constant of BI-1 increasing to 0.0149 min−1, which is 4.3 and 4.4 multiples higher than that of pure In2O3 and pure Bi2O3. Recycling experiments demonstrated that the photocatalytic composite possesses good reusability and structural stability.
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- 2024
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3. Allicin alleviates coronary atherosclerosis of mice via endothelial nitric oxide synthase(eNOS)/nuclear factor erythroid 2-related factor(Nrf2)/heme oxygenase-1(HO-1) signaling pathway
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Jingyu Yang, Hailong Si, Bo Dong, and Qin Qin
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Allicin ,eNOS ,Endothelial progenitor cells ,Coronary atherosclerosis ,Nrf2/HO-1 ,Agriculture (General) ,S1-972 ,Chemistry ,QD1-999 - Abstract
Abstract Purpose Endothelial progenitor cells (EPCs) have been revealed to interventions in atherosclerosis (AS) progressions. Traditional Chinese medicines (TCMs) have been discovered to modulate the functions of EPCs. Herein, effects of allicin on EPCs were explored in coronary atherosclerosis (CAS). Methods Allicin (5 or 10 mg/kg/d) was used to treat the ApoE−/− mice fed with high-fat diet (HFD. TC, TG, LDL-C, and HDL-C were examined. HE staining was applied for observation of CAS lesions. In vitro, EPCs were induced by ox-LDL and then treated with allicin and an eNOS inhibitor, L-NAME. Thereafter, the cell viability, apoptosis and migration were examined using CCK-8, flow cytometry and Transwell methods. Western blot was applied for evaluating eNOS, Nrf2 and HO-1 protein expression. NO production, MDA content, and SOD activity were also measured. Results Allicin inhibited CAS progression, decreased serum levels of TC, TG, and LDL-C but increased HDL-C. Moreover, counts of circulating EPCs, and the protein levels of eNOS, Nrf2 and HO-1 were increased by allicin treatment in mice fed with HFD. Allicin suppressed MDA contents but enhanced SOD activities. In vitro, allicin reversed the impacts of ox-LDL induction in EPCs, facilitating cell mobility and NO production, and decreasing apoptosis. L-NAME treatment reversed effects of allicin. Conclusion Allicin alleviated CAS progressions in mice, modulating the cell apoptosis and migration of EPCs via eNOS/ Nrf2/HO-1 pathway.
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- 2023
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4. Study of Electrochemical Catalytic Coal Gasification: Gasification Characteristics and Char Structure Evolution
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Fan Yang, Qingbo Yu, Wenjun Duan, Zhenfei Qi, and Qin Qin
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Chemistry ,QD1-999 - Published
- 2021
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5. Does Sulfoquinovosyl Diacylglycerol Synthase OsSQD1 Affect the Composition of Lipids in Rice Phosphate-Deprived Root?
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Yafei Sun, Qin Qin, Ke Song, Lijuan Sun, Tingting Jiang, Shiyan Yang, Zhouwen Li, Guohua Xu, Shubin Sun, and Yong Xue
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OsSQD1 ,glycolipids ,phospholipids ,phosphate ,root ,Biology (General) ,QH301-705.5 ,Chemistry ,QD1-999 - Abstract
Lipids are the essential components of the cell intracellular and plasma membranes. Sulfoquinovosyldiacylglycerol (SQDG) is a glycolipid; glycolipids can replace phospholipids in maintaining phosphate (Pi) homeostasis in plants which are undergoing Pi starvation. Sulfoquinovosyl diacylglycerol synthase 1 (OsSQD1) is a critical enzyme in the first step of catalyzation in the formation of SQDG in rice. In this study, the expression pattern of different zones in roots of OsSQD1 in response to different Pi conditions is examined, and it is found that OsSQD1 is highly expressed in lateral roots under Pi-sufficient and -deficient conditions. The root phenotype observation of different OsSQD1 transgenic lines suggests that the knockout/down of OsSQD1 inhibits the formation and growth of lateral roots under different Pi conditions. Additionally, the lipid concentrations in OsSQD1 transgenic line roots indicate that OsSQD1 knockout/down decreases the concentration of phospholipids and glycolipids in Pi-starved roots. The OsSQD1 mutation also changes the composition of different lipid species with different acyl chain lengths, mainly under Pi-deprived conditions. The relative transcript expression of genes relating to glycolipid synthesis and phospholipid degradation is estimated to help study the mechanism by which OsSQD1 exerts an influence on the alteration of lipid composition and concentration in Pi-starved roots. Moreover, in Pi-starved roots, the knockout of OsSQD1 decreases the unsaturated fatty acid content of phospholipids and glycolipids. To summarize, the present study demonstrates that OsSQD1 plays a key role in the maintenance of phospholipid and glycolipid composition in Pi-deprived rice roots, which may influence root growth and development under Pi-deprived conditions.
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- 2022
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6. Electrochemical catalytic coal gasification: A novel method
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Fan Yang, Qingbo Yu, Wenjun Duan, Zhenfei Qi, and Qin Qin
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Electrochemical catalysis ,Gasification ,Reactivity ,Char structure ,Syngas production ,Chemistry ,QD1-999 - Abstract
This short communication describes a new approach, the electrochemical catalytic gasification (ECG), to get high efficiency of coal gasification at low reaction temperatures. Compared to common coal gasification (CCG), the carbon conversion, CO yield and combustible components are higher in gas production in ECG and increased with power. In the ECG process, thermal electrons play a significant role.
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- 2021
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7. Near-Infrared-Driven Selective Photocatalytic Removal of Ammonia Based on Valence Band Recognition of an α‑MnO2/N-Doped Graphene Hybrid Catalyst
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Wen-Xiao Liu, Xiao-Lei Zhu, Shou-Qing Liu, Qin-Qin Gu, and Ze-Da Meng
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Chemistry ,QD1-999 - Published
- 2018
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8. Synthesis and Characterization of Sn/Ni Single Doped and Co–Doped Anatase/Rutile Mixed–Crystal Nanomaterials and Their Photocatalytic Performance under UV–Visible Light
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Qin Qin, Juan Wang, Yangwen Xia, Daixiong Yang, Qin Zhou, Xiaodong Zhu, and Wei Feng
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photocatalytic activity ,TiO2 ,mixed crystal ,Sn/Ni co–doping ,sol–gel method ,Chemical technology ,TP1-1185 ,Chemistry ,QD1-999 - Abstract
Pure and Sn/Ni co–doped TiO2 nanomaterials with anatase/rutile mixed crystal were prepared and characterized. The results show that pure TiO2 is a mixed crystal structure composed of a large amount of anatase and a small amount of rutile. Sn doping promotes the phase transformation from anatase to rutile, while Ni doping inhibits the transformation. Both single doping and co–doping are beneficial to the inhibition of photoinduced charge recombination. Sn doping shows the best inhibitory effect on photogenerated charge recombination, and increases the utilization of visible light, displaying the highest photocatalytic activity. The decolorization degree of methylene blue (MB) by Sn–TiO2 is 79.5% after 150 min. The reaction rate constant of Sn–TiO2 is 0.01022 min−1, which is 5.6 times higher than pure TiO2 (0.00181 min–1).
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- 2021
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9. A Porous Media Model for the Numerical Simulation of Acoustic Attenuation by Perforated Liners in the Presence of Grazing Flows
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Jianguo Wang, Philip Rubini, and Qin Qin
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perforated liners ,acoustic damping ,porous media model ,acoustic passive control ,numerical simulation ,combustion instability ,Technology ,Engineering (General). Civil engineering (General) ,TA1-2040 ,Biology (General) ,QH301-705.5 ,Physics ,QC1-999 ,Chemistry ,QD1-999 - Abstract
In this paper, a novel model is proposed for the numerical simulation of noise-attenuating perforated liners. Effusion cooling liners offer the potential of being able to attenuate combustion instabilities in gas turbine engines. However, the acoustic attenuation of a perforated liner is a combination of a number of interacting factors, resulting in the traditional approach of designing perforated combustor liners relying heavily on combustor rig tests. On the other hand, direct computation of thousands of small-scale holes is too expensive to be employed as an engineering design tool. In recognition of this, a novel physical velocity porous media (PVPM) model was recently proposed by the authors as a computationally less demanding approach to represent the acoustic attenuation of perforated liners. The model was previously validated for the normal incidence of a sound wave by comparison with experimental data from impedance tubes. In this paper, the model is further developed for configurations where the noise signal propagates in parallel with the perforated liners, both in the presence and absence of a mean flow. The model is significantly improved and successfully validated within coexisting grazing and bias flow scenarios, with reference to a series of well-recognized experimental data.
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- 2021
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10. Protein Adsorption at Nanorough Titanium Oxide Surfaces: The Importance of Surface Statistical Parameters beyond Surface Roughness
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Yu Yang, Steffen Knust, Sabrina Schwiderek, Qin Qin, Qing Yun, Guido Grundmeier, and Adrian Keller
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surface topography ,surface roughness ,atomic force microscopy ,ellipsometry ,adsorption ,Chemistry ,QD1-999 - Abstract
The nanoscale surface topography of biomaterials can have strong effects on protein adsorption. While there are numerous surface statistical parameters for the characterization of nanorough surfaces, none of them alone provides a complete description of surface morphology. Herein, a selection of nanorough titanium oxide surfaces has been fabricated with root-mean-square roughness (Sq) values below 2.7 nm but very different surface morphologies. The adsorption of the proteins myoglobin (MGB), bovine serum albumin (BSA), and thyroglobulin (TGL) at these surfaces was investigated in situ by ellipsometry to assess the importance of six of the most common surface statistical parameters. For BSA adsorption, both protein film thickness and time constant of adsorption were found to scale linearly with Sq s. For TGL, however, the same adsorption characteristics depend linearly on the surface skewness (Ssk), which we attribute to the rather extreme size of this protein. Finally, a mixed behavior is observed for MGB adsorption, showing different linear correlations with Sq and Ssk. These results demonstrate the importance of a thorough morphological characterization of the surfaces employed in protein adsorption and possibly also cell adhesion studies.
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- 2021
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11. Organelle-inspired supramolecular nanomedicine to precisely abolish liver tumor growth and metastasis
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Qin Qin, Yuhan Wang, Ling Wang, Jie Zhan, Shaodan Ma, Zhimou Yang, and Yanbin Cai
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Cell signaling ,Cancer therapy ,Chemistry ,Dynamic cascade process ,QH301-705.5 ,Biomedical Engineering ,Nuclear delivery ,Self-assembly ,Article ,Cell biology ,Biomaterials ,Apoptosis ,Nanofiber ,Organelle ,Extracellular ,TA401-492 ,Nanomedicine ,Organelle-mimicking ,Biology (General) ,Materials of engineering and construction. Mechanics of materials ,Intracellular ,Actin ,Biotechnology - Abstract
Organelles are responsible for the efficient storage and transport of substances in living systems. A myriad of extracellular vesicles (EVs) acts as a bridge to exchange signaling molecules in cell–cell communication, and the highly dynamic tubulins and actins contribute to efficient intracellular substance transport. The inexhaustible cues of natural cargo delivery by organelles inspire researchers to explore the construction of biomimetic architectures for “smart” delivery carriers. Herein, we report a 10-hydroxycamptothecin (HCPT)-peptide conjugate HpYss that simulates the artificial EV-to-filament transformation process for precise liver cancer therapy. Under the sequential stimulus of extracellular alkaline phosphatase (ALP) and intracellular glutathione (GSH), HpYss proceeds via tandem self-assembly with a morphological transformation from nanoparticles to nanofibers. The experimental phase diagram elucidates the influence of ALP and GSH contents on the self-assembled nanostructures. In addition, the dynamic transformation of organelle-mimetic architectures that are formed by HpYss in HepG2 cells enables the efficient delivery of the anticancer drug HCPT to the nucleus, and the size–shape change from extracellular nanoparticles (50–100 nm) to intracellular nanofibers (4–9 nm) is verified to be of key importance for nuclear delivery. Nuclear targeting of HpYss amplifies apoptosis, thus significantly enhancing the inhibitory effect of HCPT (>10-fold) to HepG2 cells. Benefitting from the spatiotemporally controlled nanostructures, HpYss exhibited deep penetration, enhanced accumulation, and long-term retention in multicellular spheroid and xenograft models, potently abolishing liver tumor growth and preventing lung metastasis. We envision that our organelle-mimicking delivery strategy provides a novel paradigm for designing nanomedicine to cancer therapy., Graphical abstract Image 1, Highlights • An organelle-inspired nanomedicine for precise liver cancer therapy is proposed. • The delivery process mimics the transport of extracellular vesicles and filaments. • The extra- and intracellular tandem self-assembly influence the nanostructures. • The dynamic size–shape change of nanomedicine actuates the nuclear delivery. • Spatiotemporally controlled nanomedicine abolishes liver tumor growth and lung metastasis.
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- 2022
12. A novel fluorescent probe for the detection of sulfur dioxide derivatives and its application in biological imaging
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Nan Ji, Wei He, Xiao-Hong Duan, Qin-Qin Tian, Xiao-Hong Zhu, Yan-Li Zhang, and Qing-Qing Yang
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Detection limit ,Nucleophilic addition ,Biocompatibility ,Chemistry ,High selectivity ,General Chemistry ,complex mixtures ,Fluorescence ,Combinatorial chemistry ,Catalysis ,respiratory tract diseases ,symbols.namesake ,Stokes shift ,Materials Chemistry ,symbols ,Naked eye ,Biological imaging - Abstract
An abnormal level of SO2 is closely related to many diseases. Therefore, developing an effective method for the detection of SO2 in biological environments has important physiological and pathological significance. In this work, a new fluorescent probe (CA-SO2) was designed and synthesized for efficiently and specifically detecting SO2 derivatives through nucleophilic addition reaction. The novel fluorescent probe (CA-SO2) showed high selectivity, fast response time (within 50 s), and low detection limit (LOD = 75 nM). Furthermore, after adding SO2 derivatives to the probe solution, the color of the solution changes from orange to colorless, which allows “naked eye” detection for SO2. Moreover, the probe has a large Stokes shift (129 nm) and excellent biocompatibility. The probe has been successfully applied to the detection of SO2 derivatives in living cells and zebrafish.
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- 2022
13. Polymers for Improved Delivery of Iodinated Contrast Agents
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Qin Qin, Yanqiu Song, Peng Zhang, Weiming Liu, Zhigang Guo, Shicheng Yang, Han Fu, Jianhua Zhang, Jing Zhang, and Zhanpeng Ye
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chemistry.chemical_classification ,Noninvasive imaging ,Biocompatibility ,Polymers ,business.industry ,Biomedical Engineering ,Contrast Media ,Polymer ,Biomaterials ,chemistry ,Iodinated contrast ,Still face ,Medical imaging ,Nanoparticles ,Medicine ,Circulation time ,Medical diagnosis ,Tomography, X-Ray Computed ,business ,Biomedical engineering - Abstract
X-ray computed tomography (CT), as one of the most widely used noninvasive imaging modalities, can provide three-dimensional anatomic details with high resolution, which plays a key role in disease diagnosis and treatment assessment. However, although they are the most prevalent and FDA-approved contrast agents, iodinated water-soluble molecules still face some challenges in clinical applications, such as fast clearance, serious adverse effects, nonspecific distribution, and low sensitivity. Because of their high biocompatibility, tunable designability, controllable biodegradation, facile synthesis, and modification capability, the polymers have demonstrated great potential for efficient delivery of iodinated contrast agents (ICAs). Herein, we comprehensively summarized the applications of multifunctional polymeric materials for ICA delivery in terms of increasing circulation time, decreasing nephrotoxicity, and improving the specificity and sensitivity of ICAs for CT imaging. We mainly focused on various iodinated polymers from the aspects of preparation, functionalization, and application in medical diagnosis. Future perspectives for achieving better imaging and clinical translation are also discussed to motivate new technologies and solutions.
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- 2021
14. Nuezhenide Exerts Anti-Inflammatory Activity through the NF-κB Pathway
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Yangling Chen, Shilin Yang, Xinxin Chen, Shan Han, Qin-Qin Wang, Youqiong Zhuo, Hongwei Gao, Renyikun Yuan, Xin-Xing Li, Chenwei Zhang, and Lichun Zhao
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LPS ,Cell Survival ,Anti-Inflammatory Agents ,Nitric Oxide ,Article ,Flow cytometry ,Proinflammatory cytokine ,chemistry.chemical_compound ,RAW264.7 cells ,Mice ,Western blot ,Glucosides ,NF-KappaB Inhibitor alpha ,medicine ,Animals ,Humans ,Cytotoxicity ,Nitrites ,Pyrans ,chemistry.chemical_classification ,NF-κB pathway ,Membrane Potential, Mitochondrial ,Reactive oxygen species ,medicine.diagnostic_test ,Interleukin-6 ,Tumor Necrosis Factor-alpha ,Transcription Factor RelA ,NF-κB ,General Medicine ,Molecular biology ,anti-inflammation ,IκBα ,Nuezhenide ,RAW 264.7 Cells ,chemistry ,Cytoplasm ,cytotoxicity ,Cytokines ,Reactive Oxygen Species ,Signal Transduction - Abstract
Background:Nuezhenide (NZD), an iridoid glycoside isolated from Ilex pubescens Hook. & Arn. var. kwangsiensis Hand.-Mazz., used as a traditional Chinese medicine for clearing Hook. & Arn. var. kwangsiensis Hand.-Mazz., used as a traditional Chinese medicine for clearing away heat and toxic materials, displays a variety of biological activities such as anti-tumor, antioxidant, and other life-protecting activities. However, a few studies involving anti-inflammatory activity and the mechanism of NZD have also been reported. In the present study, the anti-inflammatory and antioxidative effects of NZD are illustrated.Objective:This study aims to test the hypothesis that NZD suppresses LPS-induced inflammation by targeting the NF-κB pathway in RAW264.7 cells.Methods:LPS-stimulated RAW264.7 cells were employed to detect the effect of NZD on the release of cytokines by ELISA. Protein expression levels of related molecular markers were quantitated by western blot analysis. The levels of ROS, NO, and Ca2+were detected by flow cytometry. The changes in mitochondrial reactive oxygen species (ROS) and mitochondrial membrane potential (MMP) were observed and verified by fluorescence microscopy. Using immunofluorescence assay, the translocation of NF-κB/p65 from the cytoplasm into the nucleus was determined by confocal microscopy.Results:NZD exhibited anti-inflammatory activity and reduced the release of inflammatory cytokines such as nitrite, TNF-α, and IL-6. NZD suppressed the expression of the phosphorylated proteins like IKKα/β, IκBα, and p65. Besides, the flow cytometry results indicated that NZD inhibited the levels of ROS, NO, and Ca2+in LPS-stimulated RAW264.7 cells. JC-1 assay data showed that NZD reversed LPS-induced MMP loss. Furthermore, NZD suppressed LPS-induced NF-B/p65 translocation from the cytoplasm into the nucleus.Conclusions:NZD exhibits anti-inflammatory effects through the NF-κB pathway on RAW264.7 cells.
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- 2021
15. Effect of dietary canthaxanthin and xanthophyll on growth, antioxidant capacity, body colour, and BCO2 , CAT and SOD2 gene expression in Chinese soft‐shelled turtle ( Pelodiscus sinensis )
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Pei Wang, Qin Qin, Xiaoqing Wang, Zhou Xianwen, Yazhou Hu, Lingrui Ge, Zeng Dan, Gang Xiong, and Zhijia Luo
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chemistry.chemical_classification ,biology ,Pelodiscus ,SOD2 ,Body colour ,Aquatic Science ,biology.organism_classification ,law.invention ,chemistry.chemical_compound ,chemistry ,law ,Xanthophyll ,Gene expression ,Food science ,Canthaxanthin ,Turtle (robot) ,Carotenoid - Published
- 2021
16. Nonlinear Model and Dynamic Behavior of Photovoltaic Grid-Connected Inverter
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Zhi-Xian Liao, Dan Luo, Xiao-Shu Luo, Hai-Sheng Li, Qin-Qin Xiang, Guo-Xian Huang, Ting-Hui Li, and Pin-Qun Jiang
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photovoltaic grid-connected inverter ,nonlinear dynamics ,predictive control ,nonlinear model ,Technology ,Engineering (General). Civil engineering (General) ,TA1-2040 ,Biology (General) ,QH301-705.5 ,Physics ,QC1-999 ,Chemistry ,QD1-999 - Abstract
A photovoltaic grid-connected inverter is a strongly nonlinear system. A model predictive control method can improve control accuracy and dynamic performance. Methods to accurately model and optimize control parameters are key to ensuring the stable operation of a photovoltaic grid-connected inverter. Based on the nonlinear characteristics of photovoltaic arrays and switching devices, we established a nonlinear model of photovoltaic grid-connected inverters using the state space method and solved its model predictive controller. Then, using the phase diagram, folded diagram, and bifurcation diagram methods, we studied the nonlinear dynamic behavior under the influence of control parameters on both fast and slow scales. Finally, we investigated the methods of parameter selection based on the characteristics of nonlinear dynamic behavior. Our research shows that the predictive controller parameters are closely related to the bifurcation and chaos behaviors of the grid-connected photovoltaic inverter. The three-dimensional bifurcation diagram can be used to observe the periodic motion region of the control parameters. After selecting the optimization target, the bifurcation diagram can be used to guide the selection of control parameters for inverter design. The research results can be used to guide the modeling, stability analysis, and optimization design of photovoltaic grid-connected inverters.
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- 2020
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17. Adsorption and Diffusion of Hydrogen in Carbon Honeycomb
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Qin Qin, Tingwei Sun, Hanxiao Wang, Pascal Brault, Haojie An, Lu Xie, and Qing Peng
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hydrogen adsorption ,carbon honeycomb ,molecular dynamics ,grand canonical monte carlo simulations ,pressure ,temperature ,Chemistry ,QD1-999 - Abstract
Carbon honeycomb has a nanoporous structure with good mechanical properties including strength. Here we investigate the adsorption and diffusion of hydrogen in carbon honeycomb via grand canonical Monte Carlo simulations and molecular dynamics simulations including strength. Based on the adsorption simulations, molecular dynamics simulations are employed to study the effect of pressure and temperature for the adsorption and diffusion of hydrogen. To study the effect of pressure, we select the 0.1, 1, 5, 10, 15, and 20 bars. Meanwhile, we have studied the hydrogen storage capacities of the carbon honeycomb at 77 K, 153 K, 193 K, 253 K and 298 K. A high hydrogen adsorption of 4.36 wt.% is achieved at 77 K and 20 bars. The excellent mechanical properties of carbon honeycomb and its unique three-dimensional honeycomb microporous structure provide a strong guarantee for its application in practical engineering fields.
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- 2020
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18. Glutathione contributes to resistance responses to TMV through a differential modulation of salicylic acid and reactive oxygen species
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Qi-Ping Zhang, Yan-Ping Che, Feng Zhu, Zhao-Lin Ji, Peng-Xiang Zhu, and Qin-Qin Zhang
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salicylic acid ,Soil Science ,Nicotiana benthamiana ,Plant Science ,chemistry.chemical_compound ,Gene Expression Regulation, Plant ,Tobacco ,Buthionine sulfoximine ,Molecular Biology ,Disease Resistance ,Plant Diseases ,Plant Proteins ,reactive oxygen species ,chemistry.chemical_classification ,Reactive oxygen species ,biology ,systemic resistance ,Activator (genetics) ,tobacco mosaic virus ,fungi ,food and beverages ,Original Articles ,Glutathione ,Biotic stress ,biology.organism_classification ,Cell biology ,chemistry ,Original Article ,Agronomy and Crop Science ,Systemic acquired resistance ,Salicylic acid - Abstract
Systemic acquired resistance (SAR) is induced by pathogens and confers protection against a broad range of pathogens. Several SAR signals have been characterized, but the nature of the other unknown signalling by small metabolites in SAR remains unclear. Glutathione (GSH) has long been implicated in the defence reaction against biotic stress. However, the mechanism that GSH increases plant tolerance against virus infection is not entirely known. Here, a combination of a chemical, virus‐induced gene‐silencing‐based genetics approach, and transgenic technology was undertaken to investigate the role of GSH in plant viral resistance in Nicotiana benthamiana. Tobacco mosaic virus (TMV) infection results in increasing the expression of GSH biosynthesis genes NbECS and NbGS, and GSH content. Silencing of NbECS or NbGS accelerated oxidative damage, increased accumulation of reactive oxygen species (ROS), compromised plant resistance to TMV, and suppressed the salicylic acid (SA)‐mediated signalling pathway. Application of GSH or l‐2‐oxothiazolidine‐4‐carboxylic acid (a GSH activator) alleviated oxidative damage, decreased accumulation of ROS, elevated plant local and systemic resistance, enhanced the SA‐mediated signalling pathway, and increased the expression of ROS scavenging‐related genes. However, treatment with buthionine sulfoximine (a GSH inhibitor) accelerated oxidative damage, elevated ROS accumulation, compromised plant systemic resistance, suppressed the SA‐mediated signalling pathway, and reduced the expression of ROS‐regulating genes. Overexpression of NbECS reduced oxidative damage, decreased accumulation of ROS, increased resistance to TMV, activated the SA‐mediated signalling pathway, and increased the expression of the ROS scavenging‐related genes. We present molecular evidence suggesting GSH is essential for both local and systemic resistance of N. benthamiana to TMV through a differential modulation of SA and ROS., Glutathione is required for both local and systemic resistance of Nicotiana benthamiana to tobacco mosaic virus infection through a differential modulation of salicylic acid signalling and reactive oxygen species.
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- 2021
19. Strong in vitro and in vivo cytotoxic effects of two platinum(II) complexes with cryptolepine derivatives
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Qi-Pin Qin, Hong Liang, Jia-Jing Zeng, Lin Yang, Zu-Zhuang Wei, Li-Qin Qin, and Ming-Xiong Tan
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010405 organic chemistry ,Stereochemistry ,Organic Chemistry ,01 natural sciences ,In vitro ,0104 chemical sciences ,010404 medicinal & biomolecular chemistry ,chemistry.chemical_compound ,Cryptolepine ,chemistry ,In vivo ,Apoptosis ,Cancer cell ,Toxicity ,Cytotoxic T cell ,General Pharmacology, Toxicology and Pharmaceutics ,Cytotoxicity - Abstract
Two mononuclear Pt(II) compounds, [Pt(BQL1)Cl]Cl (BQL1-Pt) and [Pt(BQL2)Cl]Cl (BQL2-Pt), with [5-(benzo[4,5]furo[3,2-b]quinolin-11-yloxy)-pentyl]-bis-pyridin-2-ylmethyl-amine (BQL1) and [9-(benzo[4,5]furo[3,2-b]quinolin-11-yloxy)-nonyl]-bis-pyridin-2-ylmethyl-amine (BQL2), were prepared as new chemotypes for potential antitumor agents. In this study, the effects of cryptolepine derivatives in BQL1-Pt, 2,2′-dipicolylamine Pt(II) complex, and BQL2-Pt on cellular Pt(II) accumulation, cytotoxicity, and in vitro and in vivo antitumor activities against T-24 cancer cells and normal HL-7702 cells were evaluated. BQL1-Pt and BQL2-Pt displayed cytotoxic activities in the micromolar range (1.3 ± 0.1 and 0.2 ± 0.2 μM, respectively) on T-24 cancer cells; however, they did not exhibit any toxicity against HL-7702 cells. They triggered T-24 cell apoptosis through a mitochondrial dysfunction pathway. BQL1-Pt and BQL2-Pt prepared from the neutral BQL1 and BQL2 ligands with cryptolepine derivatives showed better antitumor activities than 2,2′-dipicolylamine. Furthermore, BQL2-Pt effectively inhibited the growth of bladder T-24 tumor in vivo. BQL2-Pt could be a potential therapeutic candidate for cancers.
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- 2021
20. Rotundic acid reduces <scp>LPS</scp> ‐induced acute lung injury in vitro and in vivo through regulating <scp>TLR4</scp> dimer
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Xu Qiongming, Shilin Yang, Hongwei Gao, Renyikun Yuan, Zhenjie Liu, Shan Han, Qin-Qin Wang, and Xin-Xing Li
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Lipopolysaccharides ,Male ,MAPK/ERK pathway ,Acute Lung Injury ,Anti-Inflammatory Agents ,Nitric Oxide Synthase Type II ,Inflammation ,Pharmacology ,Lung injury ,Mice ,03 medical and health sciences ,0302 clinical medicine ,In vivo ,medicine ,Animals ,PI3K/AKT/mTOR pathway ,Mice, Inbred BALB C ,0303 health sciences ,biology ,Chemistry ,030302 biochemistry & molecular biology ,NF-kappa B ,Triterpenes ,Toll-Like Receptor 4 ,Nitric oxide synthase ,RAW 264.7 Cells ,030220 oncology & carcinogenesis ,biology.protein ,TLR4 ,Cytokines ,Tumor necrosis factor alpha ,medicine.symptom ,Signal Transduction - Abstract
Acute lung injury (ALI) is a serious clinical disease. Rotundic acid (RA), a natural ingredient isolated from Ilex rotunda Thunb, exhibits multiple pharmacological activities. However, RA's therapeutic effect and mechanism on ALI remain to be elucidated. The present study aimed to further clarify its regulating effects on inflammation in vitro and in vivo. Our results indicated that RA significantly inhibited the overproduction of interleukin-6 (IL-6), tumor necrosis factor-α (TNF-α), cyclooxygenase-2 (COX-2), and inducible nitric oxide synthase (iNOS). RA decreased ROS production and calcium influx. In addition, RA inhibited the activation of PI3K, MAPK, and NF-κB pathways and enhanced the activity of nuclear factor E2-related factor 2 (Nrf2) signaling. The cellular thermal shift assay and docking results indicated that RA bind to TLR4 to block TLR4 dimerization. Furthermore, RA pretreatment effectively inhibited ear edema induced by xylene and LPS-induced endotoxin death and had a protective effect on LPS-induced ALI. Our findings collectively indicated that RA has anti-inflammatory effects, which may serve as a potential therapeutic option for pulmonary inflammation.
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- 2021
21. Aminolactonization of Unactivated Alkenes Catalyzed by Aryl Iodine
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Dongxu Zhang, Xiao-Jun Deng, Qin-Qin Tian, Lu-Wen Zhang, and Wei He
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Molecular Structure ,010405 organic chemistry ,Aryl ,Organic Chemistry ,chemistry.chemical_element ,Alkenes ,010402 general chemistry ,Iodine ,01 natural sciences ,Combinatorial chemistry ,Catalysis ,0104 chemical sciences ,Reaction rate ,chemistry.chemical_compound ,chemistry ,Nitrogen source ,Oxidation-Reduction - Abstract
A one-step protocol of the aryl iodine-catalyzed aminolactonization of unactivated alkenes under oxidation conditions was first reported to efficiently construct diverse amino lactones in a short time using HNTs2 as the compatible nitrogen source. In addition, we investigated the influence of the reaction rate based on the structure of the iodoarene precatalyst, which revealed the selective adjustment effect on aminolactonization and oxylactonization. Finally, preliminary experiments verified the feasibility of asymmetric aminolactonization catalyzed by a chiral iodoarene precatalyst.
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- 2021
22. Enzyme‐Instructed Self‐Assembly Enabled Monomer–Excimer Transition to Construct Higher Ordered Luminescent Supramolecular Assembly for Activity‐based Bioimaging
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Jie Zhan, Zhimou Yang, Guanghui Xu, Yumiao Chen, Yuanzhi Zhong, Yanbin Cai, Shaodan Ma, Qin Qin, and Xu Liao
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Luminescence ,Macromolecular Substances ,Nanofibers ,Supramolecular chemistry ,Enzyme-Linked Immunosorbent Assay ,Peptide ,Conjugated system ,010402 general chemistry ,Excimer ,01 natural sciences ,Catalysis ,Supramolecular assembly ,chemistry.chemical_compound ,Coumarins ,Humans ,Fluorescent Dyes ,chemistry.chemical_classification ,Molecular Structure ,010405 organic chemistry ,Optical Imaging ,General Chemistry ,Alkaline Phosphatase ,Combinatorial chemistry ,0104 chemical sciences ,Monomer ,chemistry ,Nanofiber ,Self-assembly ,HeLa Cells - Abstract
It is challenging to construct high-performing excimer-based luminescent analytic tools at low molecular concentrations. We report that enzyme-instructed self-assembly (EISA) enables the monomer-excimer transition of a coumarin dye (Cou) at low molecular concentrations, and the resulting higher ordered luminescent supramolecular assemblies (i.e., nanofibers) efficiently record the spatiotemporal details of alkaline phosphatase (ALP) activity in vitro and in vivo. Cou was conjugated to short self-assembly peptides with a hydrophilic ALP-responsive group. By ALP triggering, EISA actuated a nanoparticles-nanofibers transition at low peptide concentrations followed by monomer-excimer transition of Cou. Analysis of structure-property relationships revealed that the self-assembly motif was a prerequisite for peptides to induce the monomer-excimer transition of Cou. Luminescent supramolecular nanofibers of pYD (LSN-pYD) illuminated the intercellular bridge of cancer cells and distinguished cancer cells (tissues) from normal cells (tissues) efficiently and rapidly, promising potential use for the early diagnosis of cancer. This work extends the functions of EISA and provides a new application of supramolecular chemistry.
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- 2021
23. The human tRNA taurine modification enzyme GTPBP3 is an active GTPase linked to mitochondrial diseases
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Yong Zhang, Hong Xu, Qingrun Li, Qin-Qin Wang, Xiao-Long Zhou, Gui-Xin Peng, and En-Duo Wang
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Models, Molecular ,Cytoplasm ,TRNA modification ,Mitochondrial Diseases ,AcademicSubjects/SCI00010 ,Mutant ,GTPase ,Mitochondrion ,Biology ,medicine.disease_cause ,GTP-Binding Proteins ,Catalytic Domain ,Sf9 Cells ,Genetics ,medicine ,Animals ,Humans ,chemistry.chemical_classification ,Mutation ,Nucleic Acid Enzymes ,RNA-Binding Proteins ,Mitochondria ,Isoenzymes ,Protein Transport ,HEK293 Cells ,Enzyme ,chemistry ,Biochemistry ,Transfer RNA ,GTPBP3 - Abstract
GTPBP3 and MTO1 cooperatively catalyze 5-taurinomethyluridine (τm5U) biosynthesis at the 34th wobble position of mitochondrial tRNAs. Mutations in tRNAs, GTPBP3 or MTO1, causing τm5U hypomodification, lead to various diseases. However, efficient in vitro reconstitution and mechanistic study of τm5U modification have been challenging, in part due to the lack of pure and active enzymes. A previous study reported that purified human GTPBP3 (hGTPBP3) is inactive in GTP hydrolysis. Here, we identified the mature form of hGTPBP3 and showed that hGTPBP3 is an active GTPase in vitro that is critical for tRNA modification in vivo. Unexpectedly, the isolated G domain and a mutant with the N-terminal domain truncated catalyzed GTP hydrolysis to only a limited extent, exhibiting high Km values compared with that of the mature enzyme. We further described several important pathogenic mutations of hGTPBP3, associated with alterations in hGTPBP3 localization, structure and/or function in vitro and in vivo. Moreover, we discovered a novel cytoplasm-localized isoform of hGTPBP3, indicating an unknown potential noncanonical function of hGTPBP3. Together, our findings established, for the first time, the GTP hydrolysis mechanism of hGTPBP3 and laid a solid foundation for clarifying the τm5U modification mechanism and etiology of τm5U deficiency-related diseases.
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- 2021
24. Homogeneous and Heterogeneous Ionic Liquid System: Promising 'Ideal Catalysts' for the Fixation of CO 2 into Cyclic Carbonates
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Jianfei Sun, Jian-Zhong Yin, Qin-Qin Xu, and Zhuo-Jian Li
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Materials science ,Ideal (set theory) ,Organic Chemistry ,Carbon fixation ,Catalysis ,Inorganic Chemistry ,chemistry.chemical_compound ,Fixation (surgical) ,chemistry ,Chemical engineering ,Homogeneous ,Ionic liquid ,Physical and Theoretical Chemistry ,Porous medium - Published
- 2021
25. A Model to Predict Acoustic Resonant Frequencies of Distributed Helmholtz Resonators on Gas Turbine Engines
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Jianguo Wang, Philip Rubini, Qin Qin, and Brian Houston
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distributed Helmholtz resonator ,acoustic radiation ,hole-hole interaction effect ,acoustic passive control ,gas turbine ,Technology ,Engineering (General). Civil engineering (General) ,TA1-2040 ,Biology (General) ,QH301-705.5 ,Physics ,QC1-999 ,Chemistry ,QD1-999 - Abstract
Helmholtz resonators, traditionally designed as a narrow neck backed by a cavity, are widely applied to attenuate combustion instabilities in gas turbine engines. The use of multiple small holes with an equivalent open area to that of a single neck has been found to be able to significantly improve the noise damping bandwidth. This type of resonator is often referred to as “distributed Helmholtz resonator„. When multiple holes are employed, interactions between acoustic radiations from neighboring holes changes the resonance frequency of the resonator. In this work, the resonance frequencies from a series of distributed Helmholtz resonators were obtained via a series of highly resolved computational fluid dynamics simulations. A regression analysis of the resulting response surface was undertaken and validated by comparison with experimental results for a series of eighteen absorbers with geometries typically employed in gas turbine combustors. The resulting model demonstrates that the acoustic end correction length for perforations is closely related to the effective porosity of the perforated plate and will be obviously enhanced by acoustic radiation effect from the perforation area as a whole. This model is easily applicable for engineers in the design of practical distributed Helmholtz resonators.
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- 2019
- Full Text
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26. Mechanical Properties of Vacancy Tuned Carbon Honeycomb
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Lu Xie, Haojie An, Chenwei He, Qin Qin, and Qing Peng
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carbon honeycomb ,molecular dynamics ,defect ,mechanical properties ,Chemistry ,QD1-999 - Abstract
Carbon honeycomb (CHC) has great application potential in many aspects for the outstanding mechanical properties. However, the effect of both defects and temperature on the mechanical properties are far from reasonable understanding, which might be a huge obstacle for its promising applications as engineering materials. In this work, we investigate the effect of vacancy-type defect, which is inevitably exists in material, on the mechanical properties of CHC via reactive molecular dynamics simulations. The mechanical strength is anisotropic and decreases with the increasing temperature. CHC yield in cell axis direction since the break of C⁻C bonds on the junction. Vacancies weaken CHC by reducing the strength and failure strain. The effect of single vacancy on strength of CHC becomes more obvious with reducing temperature and is sensitive to the location and bonding of the vacancies. The maximum reduction of strength in cell axis direction is with vacancy on the middle of the wall of CHC where sp2 bonds are removed. The strength is reduced by 8.1% at 500 K, 11.5% at 300 K and 12.8% at 100 K. With 0.77% defect concentration, the strength reduces 40.3% in cell axis direction but only 18.7% in zigzag direction and 24.4% in armchair direction.
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- 2019
- Full Text
- View/download PDF
27. Subanesthetic isoflurane abates ROS-activated MAPK/NF-κB signaling to repress ischemia-induced microglia inflammation and brain injury
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Jun-Tang Li, Xiao-Shan Zhu, Ya-Li Zhao, Ling Wang, Ning-Ning Liu, Zhiqiang Yao, Qin-Qin Liu, and Chun-Fang Gao
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MAPK/ERK pathway ,Aging ,p38 mitogen-activated protein kinases ,Interleukin-1beta ,Ischemia ,microglia ,Nitric Oxide Synthase Type II ,Apoptosis ,Inflammation ,ischemia ,Pharmacology ,p38 Mitogen-Activated Protein Kinases ,Brain Ischemia ,isoflurane ,medicine ,Animals ,Chemokine CCL2 ,Neurons ,Microglia ,Interleukin-6 ,Tumor Necrosis Factor-alpha ,Chemistry ,Interleukin-8 ,NF-kappa B ,ROS ,Infarction, Middle Cerebral Artery ,Cell Biology ,medicine.disease ,neuron ,Coculture Techniques ,Rats ,carbohydrates (lipids) ,Disease Models, Animal ,medicine.anatomical_structure ,nervous system ,Cyclooxygenase 2 ,Anesthetics, Inhalation ,Tumor necrosis factor alpha ,Neuron ,medicine.symptom ,Reactive Oxygen Species ,Research Paper - Abstract
Isoflurane (ISO) elicits protective effects on ischemia-induced brain injury. We investigated whether sub-anesthetic (0.7%) ISO post-conditioning attenuates the inflammation and apoptosis in oxygen-glucose deprivation (OGD)-insulted co-cultures (microglia and neurons) in vitro and the brain injury of the middle cerebral arterial occlusion (MCAO) rat. We demonstrated that ISO augmented the viability of OGD-treated microglia and neurons. ISO reduced the expression and activation of COX2 and iNOS in OGD-challenged microglia. ISO repressed the production of tumor necrosis factor-α, interleukin (IL)-1β, IL-6, IL-8, and monocyte chemoattractant protein-1 in OGD-exposed microglia. ISO also decreased nucleosomal fragmentation and caspase-3 activity but increased mitochondrial membrane potential in OGD-stimulated microglia and neurons. Mechanistically, ISO suppressed OGD-induced microglial inflammation by blocking ROS-regulated p38 MAPK/NF-κB signaling pathway and hampered OGD-triggered microglial apoptosis in a ROS- or NO-dependent fashion. In vivo results with MCAO rats were partly consistent with the in vitro observation. These findings indicate that sub-anesthetic ISO post-conditioning abates the inflammation and apoptosis in OGD-stimulated rat microglia and the apoptosis of OGD-exposed neurons and the brain injuries of MCAO rats, suggesting it as a potentially effective therapeutic approach for ischemic brain damages.
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- 2020
28. Sonication-assisted preparation of CaO nanoparticles for antibacterial agents
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Zhen-Xing Tang, Zhen Yu, Zhi-Liang Zhang, Xin-Yi Zhang, Qin-Qin Pan, and Lu-E Shi
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nano CaO ,preparation ,antibacterial activity ,Chemistry ,QD1-999 - Abstract
The effect of calcination conditions on the size and killing activity of CaO nanoparticles towards L. plantarum was studied in this paper. The results showed that CaO nanoparticles with a diameter of 20 nm could be obtained under the investigated conditions. The lethal effect of CaO nanoparticles after incubation of 6 or 24 h increased with increasing calcination time. Using CaO-SA, CaO-SB, and CaO-SC after a 24-h exposure, 2.25, 3.37, and 5.97 log L. plantarum were killed, respectively, at a concentration of 100 ppm. The current results show that the use of CaO nanoparticles as antibacterial agents has significant potential in food-relevant industries.
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- 2013
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29. Co–N-Codoped Carbon/Co@Carbon Cloth Hybrid Derived from ZIF-67 for the Oxygen Evolution Reaction and Supercapacitors
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Xiaoxu Lai, Yong Zhang, Shouxiang Jiang, Ce Cui, Hongyan Xiao, Erhui Ren, Qin Qin, and Ronghui Guo
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Supercapacitor ,Electrode material ,Materials science ,business.industry ,General Chemical Engineering ,Oxygen evolution ,Energy Engineering and Power Technology ,chemistry.chemical_element ,Renewable energy ,Fuel Technology ,chemistry ,Chemical engineering ,Clean energy ,business ,Carbon - Abstract
Metal–organic frameworks (MOFs), which have attracted widespread interest, are used for electrode materials in renewable clean energy production and storage because of the large surface area, high ...
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- 2020
30. Degradation Pathway and Kinetics of 4-chlorphenol by Sn/Sb-Mn-GAC Composite Particle Electrode
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Li Mei, Shuming Xie, Anping Liao, and Qin Qin
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Materials science ,Hydroquinone ,Kinetics ,Oxalic acid ,02 engineering and technology ,General Chemistry ,010501 environmental sciences ,Electrochemistry ,01 natural sciences ,Grain size ,chemistry.chemical_compound ,020401 chemical engineering ,Chemical engineering ,chemistry ,Electrode ,Particle ,Degradation (geology) ,0204 chemical engineering ,0105 earth and related environmental sciences ,Water Science and Technology - Abstract
A composite particle electrode Sn/Sb-Mn-GAC was prepared by impregnation with granular activated carbon (GAC) as carrier. The surface morphology, phase composition and electrochemical properties of the particle electrode were characterized by scanning electron microscopy, X-ray diffraction and electrochemical workstation. The results show that the Sn/Sb-Mn-GAC particles have uniform grain size, good dispersity and high oxygen evolution potential. The Sn/Sb-Mn-GAC particle electrode was used to the electrochemical degradation of 4-chlorophenol. It was shown that 4-chlorophenol was almost completely removed after electrolyzing for 60 min. A large number of intermediates were produced during the degradation of 4-chlorophenol in the experimental system. The main intermediate products were benzoquinone, 4-chlorocatechol, hydroquinone, fumaric acid, oxalic acid, etc., eventually mineralized into water and carbon dioxide. The degradation pathway of 4-chlorophenol were preliminarily suggested through the analysis of intermediates in degradation process. The supported Sn/Sb-Mn-GAC particle electrode can be repeated used 4 times in three-dimensional electrochemical reactor and the kinetic model for the electrochemical oxidation of 4-chlorophenol was established. The experimental results show that the degradation process of 4-chlorophenol accords with the first-order kinetic model, the correlation coefficient is 0.98 or more. The kinetic rate constant k of Sn/Sb-Mn-GAC particle electrode is reduced when it is repeated used, but the treatment efficiency of 4-chlorophenol is still better. The results of research show that the three-dimensional electrochemical reactor using Sn/Sb-Mn-GAC particle electrode has promising application prospects in the treatment of phenolic wastewater.
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- 2020
31. Recovery kinetics of creatine in mild plantar flexion exercise using 3D creatine CEST imaging at 7 Tesla
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Dushyant Kumar, Russell T. Shinohara, Ravi Prakash Reddy Nanga, Qin Qin, Ravinder Reddy, Dan Zhu, Neil Wilson, Melissa Lynne Martin, Deepa Thakuri, Abigail Cember, and Hari Hariharan
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Coefficient of variation ,Kinetics ,Creatine ,Article ,Plantar flexion ,030218 nuclear medicine & medical imaging ,Phosphocreatine ,03 medical and health sciences ,chemistry.chemical_compound ,0302 clinical medicine ,Peroneus longus ,Humans ,Medicine ,Radiology, Nuclear Medicine and imaging ,Muscle, Skeletal ,Exercise ,biology ,business.industry ,Repeatability ,Magnetic Resonance Imaging ,chemistry ,biology.protein ,Creatine kinase ,Nuclear medicine ,business ,030217 neurology & neurosurgery - Abstract
Purpose Two-dimensional creatine CEST (2D-CrCEST), with a slice thickness of 10-20 mm and temporal resolution (τRes ) of about 30 seconds, has previously been shown to capture the creatine-recovery kinetics in healthy controls and in patients with abnormal creatine-kinase kinetics following the mild plantar flexion exercise. Since the distribution of disease burden may vary across the muscle length for many musculoskeletal disorders, there is a need to increase coverage in the slice-encoding direction. Here, we demonstrate the feasibility of 3D-CrCEST with τRes of about 30 seconds, and propose an improved voxel-wise B 1 + -calibration approach for CrCEST. Methods The current 7T study with enrollment of 5 volunteers involved collecting the baseline CrCEST imaging for the first 2 minutes, followed by 2 minutes of plantar flexion exercise and then 8 minutes of postexercise CrCEST imaging, to detect the temporal evolution of creatine concentration following exercise. Results Very good repeatability of 3D-CrCEST findings for activated muscle groups on an intraday and interday basis was established, with coefficient of variance of creatine recovery constants (τCr ) being 7%-15.7%, 7.5%, and 5.8% for lateral gastrocnemius, medial gastrocnemius, and peroneus longus, respectively. We also established a good intraday and interday scan repeatability for 3D-CrCEST and also showed good correspondence between τCr measurements using 2D-CrCEST and 3D-CrCEST acquisitions. Conclusion In this study, we demonstrated for the first time the feasibility and the repeatability of the 3D-CrCEST method in calf muscle with improved B 1 + correction to measure creatine-recovery kinetics within a large 3D volume of calf muscle.
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- 2020
32. No Longterm Severe Thyroid Dysfunction Seen In Patients With Preexisting Reduced Serum Tt3 Concentrations After A Single Large Dose Of Iodinated Contrast
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Si Hai-Long, Qin Qin, Liu Yuan-Yuan, and Zhao Bing-rang
- Subjects
medicine.medical_specialty ,Endocrinology, Diabetes and Metabolism ,medicine.medical_treatment ,Urology ,Contrast Media ,Thyrotropin ,chemistry.chemical_element ,Iodinated Contrast Agent ,Iodine ,Percutaneous Coronary Intervention ,Endocrinology ,Iodinated contrast ,Thyroid dysfunction ,medicine ,Humans ,In patient ,Prospective Studies ,Prospective cohort study ,Triiodothyronine ,business.industry ,Percutaneous coronary intervention ,General Medicine ,Thyroxine ,chemistry ,business - Abstract
After an intravenous bolus injection of 100 mL of iodinated contrast agent (370 mgI/mL), the amount of iodine atoms entering the blood is tens of thousands of times the daily dose of iodine recommended by the World Health Organization. However, the effect of iodinated contrast in patients with nonthyroidal illness, manifested as reduced serum total triiodothyronine (TT3) concentrations, is unclear. We studied the effect of iodinated contrast on thyroid function and auto-antibodies in patients with reduced TT3 after diagnosis and treatment of coronary heart disease.This was a prospective cohort study. One hundred and fifty-four stable angina pectoris patients with reduced TT3 and normal thyroid-stimulating hormone (TSH), free thyroxine (FT4), and reverse triiodothyronine (rT3) were enrolled from January, 2017, to June, 2018. All subjects had no history of thyroid dysfunction and had no recent infections, tumors, trauma, or other critical illnesses. Fourty-one patients underwent coronary angiography and 113 patients underwent coronary intervention.There were 6 patients (3.9%) with hypothyroidism and 30 patients (19.5%) developed subclinical hypothyroidism (SCHypo) on the first day after surgery. There were 6 patients (3.9%) with hypothyroidism, 6 patients (3.9%) with SCHypo, and 18 patients (11.7%) with subclinical hyperthyroidism (SCHyper) at the first month postsurgery. There were 23 patients (14.9%) with SCHyper and 6 patients (3.9%) with SCHypo at the sixth month after surgery. No patient with longterm severe thyroid dysfunction occurred during follow-up. The levels of free triiodothyronine, FT4, TT3, total thyroxine, and TSH showed statistically significant changes at 1 day, and 1, 3, and 6 months postoperative (P.005). The level of rT3 showed no statistically significant change at 1, 3, and 6 months postoperative (P.05). The levels of thyroglobulin antibody and thyroid peroxidase antibody decreased at 6 months postoperative (P.001).The risk of subclinical thyroid dysfunction and transient hypothyroidism occurred with a single large dose of iodinated contrast in the diagnosis and treatment of coronary heart disease, but no longterm severe thyroid dysfunction occurred. Patients with preoperative thyroid antibody elevation were more likely to have subclinical thyroid dysfunction after surgery.FT3 = free triiodothyronine; FT4 = free thyroxine; PCI = percutaneous coronary intervention; rT3 = reverse triiodothyronine; SCHyper = subclinical hyperthyroidism; SCHypo = subclinical hypothyroidism; TGAB = thyroglobulin antibody; TPOAB = thyroid peroxidase antibody; TT3 = total triiodothyronine; TT4 = total thyroxine; TSH = thyroid-stimulating hormone; WHO = World Health Organization.
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- 2020
33. The ethyl acetate extraction of Pileostegia tomentella (ZLTE) exerts anti-cancer effects on H1299 cells via ROS-induced canonical apoptosis
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Renyikun Yuan, Qiu-Mei Fan, Jing Leng, Wen-Tong Zhao, Li-Feng Zhang, Hongwei Gao, Shilin Yang, and Qin-Qin Wang
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Lung Neoplasms ,Cell ,Ethyl acetate ,Antineoplastic Agents ,Apoptosis ,Traditional Chinese medicine ,01 natural sciences ,03 medical and health sciences ,chemistry.chemical_compound ,0302 clinical medicine ,Carcinoma, Non-Small-Cell Lung ,Proto-Oncogene Proteins ,Lactate dehydrogenase ,Drug Discovery ,medicine ,Humans ,Lung cancer ,chemistry.chemical_classification ,Reactive oxygen species ,Plant Extracts ,010405 organic chemistry ,Cancer ,General Medicine ,Protein-Tyrosine Kinases ,medicine.disease ,0104 chemical sciences ,medicine.anatomical_structure ,Complementary and alternative medicine ,chemistry ,A549 Cells ,030220 oncology & carcinogenesis ,Cancer research - Abstract
Lung cancer is the leading cause of cancer death and the most common malignant tumor, the long-term survival of which has stagnated in the past several decades. Pileostegia tomentella Hand. Mazz is a traditional Chinese medicine called "Zhongliuteng" (ZLT) in the pharmacopeia, which has been proved to possess a potent anti-tumor effect on various cancers. In this study, the effects of ZLT N-butanol extraction (ZLTN) and ZLT ethyl acetate extraction (ZLTE) on the viability of non-small cell lung cancer cell (NSCLC) lines H1299 and A549 were evaluated. Here, we firstly reported that ZLTE significantly inhibited H1299 cells growth without affecting the release of lactate dehydrogenase (LDH). In addition, ZLTE induced caspase-dependent apoptosis in a concentration-dependent manner and increased the expression cleaved-PARP and decreased pro-caspase-3, pro-caspase-7, pro-caspase-8, and pro-caspase-9. Moreover, ZLTE increased the level of cellular reactive oxygen species (ROS) in H1299 cells to lead to apoptosis, which was reversed by N-acetyl-cysteine (NAC). Taken together, our results revealed that ZLTE induced caspase-dependent apoptosis via ROS generation, suggesting that ZLTE is a promising herbal medicine for the treatment of NSCLC.
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- 2020
34. Waste Cotton Fabric/Zinc Borate Composite Aerogel with Excellent Flame Retardancy
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Hongyan Xiao, Guo Yao, Jianwu Lan, Mi Zhou, Shouxiang Jiang, Qin Qin, Ce Cui, Ronghui Guo, Xiaoxu Lai, and Erhui Ren
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Materials science ,Zinc borate ,Renewable Energy, Sustainability and the Environment ,General Chemical Engineering ,Composite number ,Aerogel ,Flame resistance ,02 engineering and technology ,General Chemistry ,010402 general chemistry ,021001 nanoscience & nanotechnology ,01 natural sciences ,0104 chemical sciences ,chemistry.chemical_compound ,chemistry ,Chemical engineering ,Environmental Chemistry ,Cellulose ,0210 nano-technology ,Fire retardant - Abstract
A waste cotton fabric (WCF)/zinc borate (ZB) composite aerogel with flame resistance was successfully synthesized through zinc borate immobilized in the cellulose aerogel by in situ formation by di...
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- 2020
35. Mean Diffusivity in Striatum Correlates With Acute Neuronal Death but Not Lesser Neuronal Injury in a Pilot Study of Neonatal Piglets With Encephalopathy
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Polan T. Santos, Qin Qin, Raymond C. Koehler, Dapeng Liu, Peiying Liu, Dengrong Jiang, Erika P. Raven, Shawn Adams, Jennifer K. Lee, Lee J. Martin, Ewa Kulikowicz, Jiangyang Zhang, and Aylin Tekes
- Subjects
Pathology ,medicine.medical_specialty ,Swine ,Encephalopathy ,Excitotoxicity ,Pilot Projects ,medicine.disease_cause ,Article ,030218 nuclear medicine & medical imaging ,03 medical and health sciences ,chemistry.chemical_compound ,0302 clinical medicine ,Fractional anisotropy ,Animals ,Medicine ,Radiology, Nuclear Medicine and imaging ,Prospective Studies ,Neurons ,Cell Death ,business.industry ,Neonatal encephalopathy ,Putamen ,Glutamate receptor ,medicine.disease ,Diffusion Magnetic Resonance Imaging ,Diffusion Tensor Imaging ,medicine.anatomical_structure ,nervous system ,chemistry ,Neuron ,business ,Quinolinic acid - Abstract
BACKGROUND: Diffusion MRI is routinely used to evaluate brain injury in neonatal encephalopathy. Though abnormal mean diffusivity (MD) is often attributed to cytotoxic edema, the specific contribution from neuronal pathology is unclear. PURPOSE: To determine whether MD from high-resolution diffusion tensor imaging (DTI) can detect variable degrees of neuronal degeneration and pathology in piglets with brain injury induced by excitotoxicity or global hypoxia-ischemia (HI) with or without overt infarction. STUDY TYPE: Prospective. ANIMAL MODEL: Excitotoxic brain injury was induced in 6 neonatal piglets by intrastriatal stereotaxic injection of the glutamate receptor agonist quinolinic acid (QA). Three piglets underwent global HI or sham procedure. Piglets recovered for 20–96 hours before undergoing MRI (n=9). FIELD STRENGTH/SEQUENCE: 3.0T MRI with DTI, T(1)- and T(2)-weighted imaging. ASSESSMENT: MD, fractional anisotropy (FA), and qualitative T(2) injury were measured in putamen and caudate. The cell bodies of normal neurons, degenerating neurons (excitotoxic necrosis, ischemic necrosis, or necrosis-apoptosis cell death continuum), and injured neurons with equivocal degeneration were counted by histopathology. STATISTICAL TESTS: Spearman correlations were used to compare MD and FA to normal, degenerating, and injured neurons. T(2) injury and neuron counts were evaluated by descriptive analysis. RESULTS: The QA insult generated titratable levels of neuronal pathology. In QA, HI, and sham piglets, lower MD correlated with higher ratios of degenerating-to-total neurons (p0.99). Neuron counts were not related to FA (p>0.30) or to qualitative injury from T(2)-weighted MRI. DATA CONCLUSION: MD is more accurate than FA for detecting neuronal degeneration and loss during acute recovery from neonatal excitotoxic and HI brain injury. MD does not reliably detect non-fulminant, nascent, and potentially reversible neuronal injury.
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- 2020
36. NUDT21 suppresses the growth of small cell lung cancer by modulating GLS1 splicing
- Author
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Li-Sheng Wang, Hua Wang, Chu-Tse Wu, Qin-Qin Xu, Feng-Jun Xiao, and Gao Chuancheng
- Subjects
0301 basic medicine ,Lung Neoplasms ,Polyadenylation ,RNA Splicing ,Biophysics ,Regulator ,Biochemistry ,Small hairpin RNA ,03 medical and health sciences ,Transduction (genetics) ,0302 clinical medicine ,Glutaminase ,Downregulation and upregulation ,Humans ,Molecular Biology ,Cells, Cultured ,Cell Proliferation ,Chemistry ,Cleavage And Polyadenylation Specificity Factor ,Cell Biology ,Small Cell Lung Carcinoma ,respiratory tract diseases ,MicroRNAs ,030104 developmental biology ,A549 Cells ,Apoptosis ,030220 oncology & carcinogenesis ,RNA splicing ,Cancer research ,Precursor mRNA - Abstract
The mRNA precursor 3′-end modification factor NUDT21 is a major regulator of 3′UTR shortening and an important component of pre-mRNA cleavage and polyadenylation. However, its role in pathologic progress of small cell lung cancer (SCLC) remains unclear. In this study, we observed that NUDT21 expression is downregulated in SCLC tissues. Hypoxia-induced down-regulation of NUDT21 through HIF-1α. NUDT21 shRNA transduction promotes proliferation and inhibits apoptosis of A549 cells. NUDT21 inhibition also promotes tumor growth in a mouse xenograft model. Furthermore, we clarified that HIF-1α mediated NUDT21 downregulation which altered the expression patterns of two isoforms of GLS1, GAC and KGA. These results link the hypoxic tumor environments to aberrant glutamine metabolism which is important for cellular energy in SCLC cells. Therefore, NUDT21 could be considered as a potential target for the treatment of SCLC.
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- 2020
37. Morpho-physiological and transcriptome analysis provide insights into the effects of zinc application on nitrogen accumulation and metabolism in wheat (Triticum aestivum L.)
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Tingting Jiang, Ke Song, Qin Qin, Yafei Sun, Qiaoming Jiang, Yong Xue, and Sun Lijuan
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0106 biological sciences ,0301 basic medicine ,Nitrogen ,Physiology ,Phenylalanine ,Plant Science ,Plant Roots ,01 natural sciences ,03 medical and health sciences ,chemistry.chemical_compound ,Biosynthesis ,Glutamine synthetase ,Genetics ,Triticum ,chemistry.chemical_classification ,Phenylpropanoid ,Gene Expression Profiling ,food and beverages ,Metabolism ,Glutathione ,Amino acid ,Zinc ,030104 developmental biology ,chemistry ,Biochemistry ,Shoot ,010606 plant biology & botany - Abstract
Nitrogen (N) is the essential nutrient for wheat growth and development, its accumulation and metabolism controlled by many other elements. Zinc (Zn) is one of the important elements which tends to have effects on plant N homeostasis. Here in our study, 0 μM and 5 μM Zn was applied to the wheat seedlings culturing in 5 mM (+N) and 0.5 mM (-N) N treatments, respectively. The results showed that the shoot and root length growth performance, total N, NO3−, and amino acid concentrations, glutamine synthetase (GS) activity of wheat were facilitated by 5 μM Zn application under + N and –N conditions. Quantitative real-time PCR (qRT-PCR) analysis indicated that several NO3− transporters genes (TaNRT2.1, TaNPF7.1 and TaNPF7.2) and the genes encoding GS (TaGS1 and TaGS2) were induced by 5 μM Zn. In addition, transcriptional changes in wheat shoots and roots with Zn application were tested by RNA-seq techniques. A total of 147/551 induced and 36/2162 reduced differentially expression genes (DEGs) was detected in wheat shoots/roots, respectively. GO and KEGG enrichment analyses showed that 5 μM Zn mainly affected the glutathione (GSH) metabolism, phenylpropanoid biosynthesis and amino acid metabolism, involving in N homeostasis. Furthermore, the relative expression of genes related to phenylalanine, cysteine and methionine metabolism was induced by 5 μM Zn to promote the amino acid accumulation. Overall, these results highlight the facilitating of N accumulation by low level Zn, and provide an insight into the effects of Zn on N metabolism in wheat.
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- 2020
38. RETRACTED: Two new α, β-unsaturated bis-enone derivatives: Anti-gastric cancer activity and docking study
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Zhu Yu and Qin-Qin Le
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Inorganic Chemistry ,chemistry.chemical_compound ,chemistry ,Stereochemistry ,Docking (molecular) ,Organic Chemistry ,Materials Chemistry ,Enone - Abstract
This article has been retracted, and the online PDF has been watermarked “RETRACTION”. The retraction notice is available at http://doi.org/10.3233/MGC-220954.
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- 2020
39. TC26, a teleost TFPI-1 derived antibacterial peptide that induces degradation of bacterial nucleic acids and inhibits bacterial infection in vivo
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Guang-hua Wang, Qin-qin Gu, Dong-fang Hao, Hong-mei Liu, Yan-li Su, Bing Xie, Min Zhang, and Jing-jing Wang
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DNA, Bacterial ,Fish Proteins ,0301 basic medicine ,Carps ,Peptide ,Vibrio vulnificus ,Aquatic Science ,medicine.disease_cause ,Microbiology ,03 medical and health sciences ,In vivo ,medicine ,Animals ,Environmental Chemistry ,Pathogen ,chemistry.chemical_classification ,Bacteria ,biology ,Bacterial Infections ,04 agricultural and veterinary sciences ,General Medicine ,biology.organism_classification ,030104 developmental biology ,chemistry ,Staphylococcus aureus ,Flatfishes ,040102 fisheries ,Nucleic acid ,0401 agriculture, forestry, and fisheries ,Micrococcus luteus ,Antimicrobial Cationic Peptides - Abstract
At present, several reports have indicated that the C-terminal peptides of tissue factor pathway inhibitor 1 (TFPI-1) were active antibacterial peptides. However, the functions of TFPI-1 C-terminal peptides in teleost are still very limited. In this study, a C-terminal peptide, TC26 (with 26 amino acids), derived from common carp (Cyprinus carpio) TFPI-1, was synthesized and investigated for its antibacterial spectrum, action mechanism, as well as the in vivo effects on bacterial invasion. Our results showed that TC26 was active against Gram-positive bacteria Micrococcus luteus and Staphylococcus aureus, as well as Gram-negative bacterium Vibrio vulnificus. TC26 treatment facilitated the bactericidal process of erythromycin by enhancing the out-membrane permeability of V. vulnificus. During the bactericidal process, TC26 killed the target bacterial cells Vibrio vulnificus, by destroying cell membrane integrity, penetrating into the cytoplasm and inducing degradation of genomic DNA and total RNA. In vivo study showed that administration of turbot with TC26 before bacterial infection significantly reduced pathogen dissemination and replication in tissues. These results indicated that TC26 is a novel and active antibacterial peptide and may play a vital role in fighting pathogenic infection in aquaculture.
- Published
- 2020
40. Enhancement of a Double Cosolvent on Solubility of [Bmim][Ac] and [Bmim][NTf2] in Supercritical CO2
- Author
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Guo-Yue Qiao, Qin-Qin Xu, Jian-Zhong Yin, Zhuo-Jian Li, Jianfei Sun, Gen Li, and Hao-Ming Xiang
- Subjects
Trifluoromethyl ,Supercritical carbon dioxide ,General Chemical Engineering ,02 engineering and technology ,General Chemistry ,Sulfanilamide ,010402 general chemistry ,01 natural sciences ,Supercritical fluid ,0104 chemical sciences ,chemistry.chemical_compound ,020401 chemical engineering ,chemistry ,medicine ,0204 chemical engineering ,Solubility ,medicine.drug ,Nuclear chemistry - Abstract
Solubility of 1-butyl-3-methylimidazolium bis[(trifluoromethyl)sulfanilamide] ([Bmim][NTf2]) and 1-butyl-3-methylimidazolium acetate ([Bmim][Ac]) in supercritical carbon dioxide (scCO2) using ethan...
- Published
- 2020
41. Improvement of the Oxygen Uncoupling Properties of Copper-Based Composite Oxygen Carriers for Chemical Looping Air Separation
- Author
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Martin van Sint Annaland, Qin Qin, Kun Wang, Qingbo Yu, Tianwei Wu, Chemical Process Intensification, and EIRES Chem. for Sustainable Energy Systems
- Subjects
Air separation ,General Chemical Engineering ,Composite number ,Energy Engineering and Power Technology ,chemistry.chemical_element ,02 engineering and technology ,021001 nanoscience & nanotechnology ,Oxygen ,Copper ,Fuel Technology ,020401 chemical engineering ,chemistry ,Chemical engineering ,Limiting oxygen concentration ,0204 chemical engineering ,0210 nano-technology ,Product gas ,Chemical looping combustion - Abstract
To increase the oxygen concentration in the product gas of a chemical looping air separation (CLAS) system, it is important to reduce the oxygen uncoupling temperature of the oxygen carrier (OC). In this paper, it is investigated whether and to what extent the addition of Mn2O3, Co3O4, Pb3O4, and Cr2O3, all of which have oxygen uncoupling propensity according to thermodynamics, to CuO improves the oxygen uncoupling behavior of the mixed-oxide OC at lower temperatures. Using thermogravimetric analyses, it is shown that the oxygen uncoupling temperature of a Cu-Mn composite OC is decreased by approximately 200 °C relative to a Cu OC. In addition, the oxygen transport capacity of this composite OC can reach up to 0.056 g O2/g OC. Density functional theory calculations have been carried out to analyze the changes in reactivity and stability of the mixed-oxide OC. When a Mn3O4(001) surface adsorbs a Cu4O4 cluster, the average bond length of Cu-O in the Cu4O4 cluster increases from 1.983 to 2.047 Å and the charge is transferred from Cu4O4 to Mn3O4(001). Chemical reaction between the cluster and the surface occurs, and Cu-Mn composite oxides are formed after adsorption. Moreover, the adsorption energy is -3.749 eV, which is higher than that of Cu4O4 on a CuO(111) surface (-2.92 eV), and the composite OC has better stability and sintering resistance than the Cu OC. The stability of the composite OC was also investigated at 900 °C under reducing conditions and at 700 °C under oxidizing conditions. The results show that the Cu-Mn/Zr composite OC remains stable over 15 consecutive cycles. Moreover, the Cu-Mn composite does not only reduce the oxygen uncoupling temperature of CuO but it also overcomes thermodynamic limitations of the oxidation of Mn3O4 to Mn2O3, where the redox reaction of the Cu-Mn composite OC can be expressed as follows: CuxMn3-xO4 ⇋ CuxMn2-x + O2(g). From the results, it can be concluded that Mn2O3 is the most suitable composite oxide to improve the oxygen uncoupling properties of a Cu OC for oxygen uncoupling in the CLAS system.
- Published
- 2020
42. Scopoletin ameliorates anxiety-like behaviors in complete Freund’s adjuvant-induced mouse model
- Author
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Qin-Qin Tian, Ting Sun, Yan Wang, Qi Yang, Qing-Qing Liu, Le Yang, An Liu, Li Luo, and Ming-gao Zhao
- Subjects
Male ,Models, Molecular ,0301 basic medicine ,Protein Conformation ,Freund's Adjuvant ,Pharmacology ,Anxiety ,Open field ,lcsh:RC346-429 ,Elevated Plus Maze Test ,Mice ,GABA ,0302 clinical medicine ,Receptor ,Angelica ,Neurotransmitter Agents ,Chemistry ,GABAA receptor ,NF-kappa B ,Glutamate receptor ,Amygdala ,Receptors, Neurotransmitter ,Molecular Docking Simulation ,Cytokines ,Microglia ,Glutamate ,Anxiety disorder ,Elevated plus maze ,MAP Kinase Signaling System ,medicine.drug_class ,Inhibitory postsynaptic potential ,Anxiolytic ,03 medical and health sciences ,Cellular and Molecular Neuroscience ,medicine ,Animals ,GABA-A Receptor Agonists ,Molecular Biology ,lcsh:Neurology. Diseases of the nervous system ,Inflammation ,Scopoletin ,Research ,medicine.disease ,Mice, Inbred C57BL ,Disease Models, Animal ,030104 developmental biology ,Anti-Anxiety Agents ,4-Aminobutyrate Transaminase ,Open Field Test ,030217 neurology & neurosurgery ,Drugs, Chinese Herbal ,Phytotherapy - Abstract
Anxiety disorder is highly prevalent worldwide and represents a chronic and functionally disabling condition, with high levels of psychological stress characterized by cognitive and physiological symptoms. Scopoletin (SP), a main active compound in Angelica dahurica, is traditionally used for the treatment of headache, rhinitis, pain, and other conditions. Here, we evaluated the effects of SP in a mouse model of complete Freund’s adjuvant (CFA)-induced chronic inflammation anxiety. SP (2.0, 10.0, 50.0 mg/kg) administration for 2 weeks dose-dependently ameliorated CFA-induced anxiety-like behaviors in the open field test and elevated plus maze test. Moreover, we found that SP treatment inhibited microglia activation and decreased both peripheral and central IL-1β, IL-6, and TNF-α levels in a dose-dependent manner. Additionally, the imbalance in excitatory/inhibitory receptors and neurotransmitters in the basolateral nucleus after CFA injection was also modulated by SP administration. Our findings indicate that the inhibition of the nuclear factor-kappa B and mitogen-activated protein kinase signaling pathways involving anti-inflammatory activities and regulation of the excitatory/inhibitory balance can be attributed to the anxiolytic effects of SP. Moreover, our molecular docking analyses show that SP also has good affinity for gamma-aminobutyric acid (GABA) transaminase and GABAA receptors. Therefore, these results suggest that SP could be a candidate compound for anxiolytic therapy and for use as a structural base for developing new drugs.
- Published
- 2020
43. Highly cytotoxic, cyclometalated iridium(<scp>iii</scp>)-5-fluoro-8-quinolinol complexes as cancer cell mitochondriotropic agents
- Author
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Zhen-Feng Wang, Lin Yang, Chun-Jie Liang, Hong Liang, Qi-Pin Qin, Li-Qin Qin, Ming-Xiong Tan, and Bi-Qun Zou
- Subjects
biology ,Stereochemistry ,chemistry.chemical_element ,Depolarization ,General Chemistry ,Matrix metalloproteinase ,biology.organism_classification ,Catalysis ,HeLa ,chemistry ,Apoptosis ,Cancer cell ,Materials Chemistry ,Cytotoxic T cell ,Iridium ,Inner mitochondrial membrane - Abstract
Four mononuclear cyclometalated iridium(III) complexes, namely, [Ir(FQ)(L1)2] (Ir-1), [Ir(FQ)(L2)2] (Ir-2), [Ir(FQ)(L3)2] (Ir-3) and [Ir(FQ)(L4)2]·2CH3OH (Ir-4) using 5-fluoro-8-quinolinol (H-FQ)-based ligands and [(C^N)2IrCl(μ-Cl)]2 precursor have been first synthesised. The two most effective complexes (containing 7,8-benzoquinoline (H-L3) and 1-phenylpyrazole (H-L4)), Ir-3 and Ir-4, kill HeLa cells in the nanomole range, with the IC50 values of 0.170 ± 0.05 and 0.035 ± 0.002 μM, respectively, indicating that they could potentially inhibit HeLa tumour populations at a lower concentration. Encouragingly, Ir-3 and Ir-4 induce HeLa apoptosis, as indicated by the clear changes in the apoptosis-associated proteins; both accumulate to a high extent in the mitochondrial fraction; promote mitochondrial membrane (MMP) depolarisation and loss of MMP; and trigger caspase-mediated mitochondrial dysfunction apoptosis pathways. To the best of our knowledge, this study is the first to synthesize cyclometalated iridium(III)-5-fluoro-8-quinolinol complexes that can function as mitochondrion-targeting anticancer drugs.
- Published
- 2020
44. Secreted Wnt6 mediates diabetes-associated centrosome amplification via its receptor FZD4
- Author
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Shao Chin Lee, Pu Wang, Yuan Fei Li, Jie Wang, Qin Ju He, Qin Qin Liu, and Qi Gui Wu
- Subjects
Blood Glucose ,Glycation End Products, Advanced ,0301 basic medicine ,animal structures ,FZD4 ,Physiology ,Cell ,Palmitic Acid ,Type 2 diabetes ,Diabetes Mellitus, Experimental ,03 medical and health sciences ,0302 clinical medicine ,Downregulation and upregulation ,Proto-Oncogene Proteins ,Biomarkers, Tumor ,medicine ,Animals ,Humans ,Insulin ,ROCK1 ,Receptor ,Protein kinase A ,Wnt Signaling Pathway ,Centrosome ,Mice, Inbred ICR ,rho-Associated Kinases ,Chemistry ,Cell Biology ,HCT116 Cells ,medicine.disease ,Frizzled Receptors ,Rats ,Cell biology ,Wnt Proteins ,030104 developmental biology ,medicine.anatomical_structure ,14-3-3 Proteins ,Diabetes Mellitus, Type 2 ,030220 oncology & carcinogenesis ,Exoribonucleases ,Female ,Protein Binding - Abstract
We recently published that type 2 diabetes promotes cell centrosome amplification via upregulation of Rho-associated protein kinase 1 (ROCK1) and 14-3-3 protein-σ (14-3-3σ). This study further investigates the molecular mechanisms underlying diabetes-associated centrosome amplification. We found that treatment of cells with high glucose, insulin, and palmitic acid levels increased the intracellular and extracellular protein levels of Wingless-type MMTV integration site family member 6 (Wnt6) as well as the cellular level of β-catenin. The treatment also activated β-catenin and promoted its nuclear translocation. Treatment of cells with siRNA species for Wnt6, Frizzled-4 (FZD4), or β-catenin as well as introduction of antibodies against Wnt6 or FZD4 to the cell culture medium could all attenuate the treatment-triggered centrosome amplification. Moreover, we showed that secreted Wnt6-FZD4-β-catenin was the signaling pathway that was upstream of ROCK1 and 14-3-3σ. We found that advanced glycation end products (AGEs) were also able to increase the cellular and extracellular levels of Wnt6, the cellular protein level of β-catenin, and centrosome amplification. Treatment of the cells with siRNA species for Wnt6 or FZD4 as well as introduction of antibodies against Wnt6 or FZD4 to the cell culture could all inhibit the AGEs-elicited centrosome amplification. In colon tissues from a diabetic mouse model, the protein levels of Wnt6 and 14-3-3σ were increased. In conclusion, our results showed that the pathophysiological factors in type 2 diabetes, including AGEs, were able to induce centrosome amplification. It is suggested that secreted Wnt6 binds to FZD4 to activate the canonical Wnt6 signaling pathway, which is upstream of ROCK1 and 14-3-3σ, and that this is the cell signaling pathway underlying diabetes-associated centrosome amplification.
- Published
- 2020
45. Fabrication of Ag–ZnO@ carboxymethyl cellulose/K-carrageenan/graphene oxide/konjac glucomannan hydrogel for effective wound dressing in nursing care for diabetic foot ulcers
- Author
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Ming Lei, Jie Zhong, Qin-Qin Yu, Yong-Hua Li, Hu Yu, Jia-Yan Dong, and Xiao-Xia Li
- Subjects
Materials Science (miscellaneous) ,Nanochemistry ,macromolecular substances ,02 engineering and technology ,010402 general chemistry ,complex mixtures ,01 natural sciences ,Silver nanoparticle ,Nursing care ,chemistry.chemical_compound ,medicine ,Electrical and Electronic Engineering ,Physical and Theoretical Chemistry ,Fibroblast ,Chemistry ,technology, industry, and agriculture ,Cell Biology ,021001 nanoscience & nanotechnology ,Atomic and Molecular Physics, and Optics ,0104 chemical sciences ,Carrageenan ,Carboxymethyl cellulose ,medicine.anatomical_structure ,Swelling ,medicine.symptom ,0210 nano-technology ,Wound healing ,Biotechnology ,Nuclear chemistry ,medicine.drug - Abstract
In the present investigation, a new Ag–ZnO loaded carboxymethyl cellulose/K-carrageenan/graphene oxide/konjac glucomannan (Ag–ZnO@CGK) hydrogel was effectively prepared by means of a straight forward two step technique for clinical applications as wound-recuperating materials. In the first step, silver nanoparticles were synthesized with green deoxidizer mango peel extracts. The Ag–ZnO@CGK hydrogel indicated incredible swelling assimilation and impressive mechanical properties. Also, Ag–ZnO@CGK hydrogel exhibited great bactericidal movement against test microorganisms. In vitro viability testing demonstrated that fibroblast cells could endure well within the sight of Ag@CGK hydrogel, showing that Ag–ZnO@CGK hydrogel has great viability. In vivo animal models demonstrated that the Ag–ZnO@CGK hydrogel adequately quickened wound recuperating and histological examinations demonstrated that they have advanced fibroblast development and quickened epithelialization. The test results demonstrated that Ag–ZnO@CGK hydrogel has incredible potential in advanced wound healing.
- Published
- 2019
46. Selecting suitable oxygen carriers for chemical looping oxidative dehydrogenation of propane by thermodynamic method
- Author
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Limin Hou, Kun Wang, Qin Qin, Tianwei Wu, Qingbo Yu, and Wenjun Duan
- Subjects
Chemistry ,chemistry.chemical_element ,Condensed Matter Physics ,Oxygen ,Gibbs free energy ,Propene ,symbols.namesake ,chemistry.chemical_compound ,Chemical engineering ,Propane ,symbols ,Dehydrogenation ,Chemical stability ,Reactivity (chemistry) ,Physical and Theoretical Chemistry ,Chemical looping combustion - Abstract
The growing demand of propene and its derivatives promotes the development of on-purpose propene production technology. Chemical looping oxidative dehydrogenation of propane (CL-ODHP) is an alternative with several advantages. The research in this paper focuses on selecting suitable oxygen carrier for CL-ODHP process by a comprehensive thermodynamic method. The Gibbs free energy changes of propane oxidative dehydrogenation reactions to temperature for 45 different oxygen carriers are calculated to evaluate their reactivity and availability for propane oxidative dehydrogenation. Meanwhile, the chemical stability including gas oxygen releasing and hydroxides formation of different oxygen carrier systems are considered. Furthermore, the Gibbs free energy minimization method is used to calculate the equilibrium compositions of CL-ODHP reactions system considering side reactions. And propane conversion and propene selectivity of different oxygen carriers under different conditions are obtained. Other important properties are also qualitatively estimated. Among the studied oxygen carriers, Mn-based and Mo-based oxygen carriers would be more suitable for CL-ODHP process than others. And Al2O3, SiO2, TiO2, ZrO2 and Y2O3 can be the suitable binder candidates.
- Published
- 2019
47. Oncogenic USP22 supports gastric cancer growth and metastasis by activating c-Myc/NAMPT/SIRT1-dependent FOXO1 and YAP signaling
- Author
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Qin-Qin Liu, Xiao-Shan Zhu, Ya-Li Zhao, Jun-Tang Li, Hongxia Liu, Chun-Fang Gao, Xusheng Zhao, Ning-Ning Liu, and Changsong Wang
- Subjects
Male ,Aging ,proliferation ,FOXO1 ,Apoptosis ,Mice, SCID ,Metastasis ,Proto-Oncogene Proteins c-myc ,Mice ,Western blot ,Sirtuin 1 ,Cell Movement ,Stomach Neoplasms ,Cell Line, Tumor ,medicine ,Animals ,Humans ,Neoplasm Invasiveness ,Nicotinamide Phosphoribosyltransferase ,Adaptor Proteins, Signal Transducing ,Aged ,Cell Proliferation ,Gene knockdown ,medicine.diagnostic_test ,Chemistry ,Forkhead Box Protein O1 ,gastric cancer ,Cancer ,YAP-Signaling Proteins ,Cell Biology ,Middle Aged ,medicine.disease ,invasion ,Prognosis ,Cell culture ,Gene Knockdown Techniques ,ubiquitin-specific peptidase 22 ,Cancer research ,Cytokines ,Female ,Signal transduction ,Ubiquitin Thiolesterase ,Research Paper ,Signal Transduction ,Transcription Factors - Abstract
In this study, we investigated the role of ubiquitin-specific protease 22 (USP22) in the growth and progression of gastric cancer (GC). USP22 mRNA and protein levels were significantly higher in GC tissue samples and GC cell lines than in adjacent noncancerous tissue samples and a normal gastric mucosal epithelial cell line (GES1), respectively. USP22 knockdown significantly decreased in vitro survival, proliferation, migration, and invasiveness of GC cells compared with the controls. Western blot analysis of control and USP22-silenced GC cells showed that USP22 modulates the c-Myc/NAMPT/SIRT1-dependent FOXO1 and YAP signaling pathways. Subcutanenous injection of USP22-silenced GC cells into SCID mice generated significantly smaller xenograft tumors than did control cells. Moreover, USP22-silenced GC cells showed less lung metastasis than the controls following tail vein injection in SCID mice. In addition, high USP22 expression correlated positively with tumor size, advanced stage and metastasis, and correlated negatively with tumor differentiation and prognosis in GC patients. These results show that USP22 regulates growth and progression of GC via the c-Myc/NAMPT/SIRT1-dependent FOXO1 and YAP signaling pathways.
- Published
- 2019
48. Curdione and Schisandrin C Synergistically Reverse Hepatic Fibrosis via Modulating the TGF-β Pathway and Inhibiting Oxidative Stress
- Author
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Wenzhang Dai, Qin Qin, Zhiyong Li, Li Lin, Ruisheng Li, Zhie Fang, Yanzhong Han, Wenqing Mu, Lutong Ren, Tingting Liu, Xiaoyan Zhan, Xiaohe Xiao, and Zhaofang Bai
- Subjects
Schisandra chinensis ,QH301-705.5 ,Pharmacology ,medicine.disease_cause ,Cell and Developmental Biology ,In vivo ,medicine ,oxidative stress ,hepatic fibrosis ,Biology (General) ,Original Research ,biology ,Chemistry ,Cell Biology ,biology.organism_classification ,Hepatic stellate cell activation ,TGF-β1/Smads signaling pathway ,medicine.anatomical_structure ,schisandrin C ,Hepatocyte ,Hepatic stellate cell ,Signal transduction ,Hepatic fibrosis ,Oxidative stress ,Curdione ,Developmental Biology - Abstract
Hepatic fibrosis is the final pathway of several chronic liver diseases, which is characterized by the accumulation of extracellular matrix due to chronic hepatocyte damage. Activation of hepatic stellate cells and oxidative stress (OS) play an important role in mediating liver damage and initiating hepatic fibrosis. Hence, hepatic fibrosis can be reversed by inhibiting multiple channels such as oxidative stress, liver cell damage, or activation of hepatic stellate cells. Liuwei Wuling Tablets is a traditional Chinese medicine formula with the effect of anti- hepatic fibrosis, but the composition and mechanism of reversing hepatic fibrosis are still unclear. Our study demonstrated that one of the main active components of the Chinese medicine Schisandra chinensis, schisandrin C (Sin C), significantly inhibited oxidative stress and prevented hepatocyte injury. Meanwhile one of the main active components of the Chinese medicine Curdione inhibited hepatic stellate cell activation by targeting the TGF-β1/Smads signaling pathway. The further in vivo experiments showed that Sin C, Curdione and the combination of both have the effect of reversing liver fibrosis in mice, and the combined effect of inhibiting hepatic fibrosis is superior to treatment with Sin C or Curdione alone. Our study provides a potential candidate for multi-molecular or multi-pathway combination therapies for the treatment of hepatic fibrosis and demonstrates that combined pharmacotherapy holds great promise in the prevention and treatment of hepatic fibrosis.
- Published
- 2021
49. Metabolomic Profiling of Poor Ovarian Response Identifies Potential Predictive Biomarkers
- Author
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Caixia Yuan, Qin Qin, Lingling Fan, Hong Li, Haixia Song, and Fang Zhang
- Subjects
Adult ,Anti-Mullerian Hormone ,Niacinamide ,China ,Endocrinology, Diabetes and Metabolism ,Cell ,Pharmacology ,Niacin ,Diseases of the endocrine glands. Clinical endocrinology ,ovarian reserve ,chemistry.chemical_compound ,Young Adult ,Metabolomics ,Endocrinology ,Ovulation Induction ,Medicine ,Humans ,serum metabolomics ,Ovarian reserve ,Whole blood ,Original Research ,business.industry ,biomarkers ,Antral follicle ,Prognosis ,RC648-665 ,poor ovarian response (POR) ,medicine.anatomical_structure ,chemistry ,Succinic acid ,Case-Control Studies ,Metabolome ,Female ,nicotinate and nicotinamide metabolism pathway ,business ,Infertility, Female ,Prostaglandin H2 ,Metabolic Networks and Pathways ,Hormone - Abstract
ObjectiveTo characterize the serum metabolomic profile and its role in the prediction of poor ovarian response (POR).Patient(s)Twenty-five women with normal ovarian reserve (24-33 years, antral follicle count [AFC] ≥5, anti-Müllerian hormone [AMH] ≥1.2 ng/ml) as the control group and another twenty-five women with POR (19-35 years, AFC ResultsA total of 538 different metabolites were finally identified in the two groups. Tetracosanoic acid, 2-arachidonoylglycerol, lidocaine, cortexolone, prostaglandin H2,1-naphthylamine, 5-hydroxymethyl-2-furancarboxaldehyde, 2,4-dinitrophenol, and D-erythrulose1-phosphate in POR were significantly different from control as were most important metabolites in support vector machines (p <0.05). Metabolomic profiling, together with support vector machines and pathway analysis found that the nicotinate and nicotinamide metabolism pathway, including L-aspartic acid, 6-hydroxynicotinate, maleic acid, and succinic acid semialdehyde, was identified to have significant differences in POR women compared to control women, which may be associated with ovarian reserve.ConclusionThis study indicated that LC–MS-based untargeted metabolomics analysis of serum provided biological markers for women with POR. The nicotinate and nicotinamide metabolism pathway may offer new insight into the complementary prediction and therapeutic potential of POR. The functional associations of these metabolites need further investigation.
- Published
- 2021
50. Molecular-Level Understanding of Selectively Photocatalytic Degradation of Ammonia via Copper Ferrite/N-Doped Graphene Catalyst under Visible Near-Infrared Irradiation
- Author
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Hang Zhang, Yang Zhou, Shou-Qing Liu, Qin-Qin Gu, Ze-Da Meng, and Li Luo
- Subjects
molecular recognition ,selective photocatalysis ,N-doped graphene ,copper ferrite ,Z-scheme configuration ,Ammonia ,Chemical technology ,TP1-1185 ,Chemistry ,QD1-999 - Abstract
Developing photocatalysts with molecular recognition function is very interesting and desired for specific applications in the environmental field. Copper ferrite/N-doped graphene (CuFe2O4/NG) hybrid catalyst was synthesized and characterized by surface photovoltage spectroscopy, X-ray powder diffraction, transmission electron microscopy, Raman spectroscopy, UV–Vis near-infrared diffuse reflectance spectroscopy and X-ray photoelectron spectroscopy. The CuFe2O4/NG catalyst can recognize ammonia from rhodamine B (RhB) in ammonia-RhB mixed solution and selectively degrade ammonia under visible near-infrared irradiation. The degradation ratio for ammonia reached 92.6% at 6 h while the degradation ratio for RhB was only 39.3% in a mixed solution containing 100.0 mg/L NH3-N and 50 mg/L RhB. Raman spectra and X-ray photoelectron spectra indicated ammonia adsorbed on CuFe2O4 while RhB was adsorbed on NG. The products of oxidized ammonia were detected by gas chromatography, and results showed that N2 was formed during photocatalytic oxidization. Mechanism studies showed that photo-generated electrons flow to N-doped graphene following the Z-scheme configuration to reduce O2 dissolved in solution, while photo-generated holes oxidize directly ammonia to nitrogen gas.
- Published
- 2018
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