270 results on '"Zhu-hong Li"'
Search Results
2. The Heptaprenyl Diphosphate Synthase (Coq1) Is the Target of a Lipophilic Bisphosphonate That Protects Mice against Toxoplasma gondii Infection
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Melissa A. Sleda, Zhu-Hong Li, Ranjan Behera, Baihetiya Baierna, Catherine Li, Jomkwan Jumpathong, Satish R. Malwal, Makoto Kawamukai, Eric Oldfield, and Silvia N. J. Moreno
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Toxoplasma gondii ,isoprenoids ,ubiquinone ,mitochondria ,bisphosphonate ,Microbiology ,QR1-502 - Abstract
ABSTRACT Prenyldiphosphate synthases catalyze the reaction of allylic diphosphates with one or more isopentenyl diphosphate molecules to form compounds such as farnesyl diphosphate, used in, e.g., sterol biosynthesis and protein prenylation, as well as longer “polyprenyl” diphosphates, used in ubiquinone and menaquinone biosynthesis. Quinones play an essential role in electron transport and are associated with the inner mitochondrial membrane due to the presence of the polyprenyl group. In this work, we investigated the synthesis of the polyprenyl diphosphate that alkylates the ubiquinone ring precursor in Toxoplasma gondii, an opportunistic pathogen that causes serious disease in immunocompromised patients and the unborn fetus. The enzyme that catalyzes this early step of the ubiquinone synthesis is Coq1 (TgCoq1), and we show that it produces the C35 species heptaprenyl diphosphate. TgCoq1 localizes to the mitochondrion and is essential for in vitro T. gondii growth. We demonstrate that the growth defect of a T. gondii TgCoq1 mutant is rescued by complementation with a homologous TgCoq1 gene or with a (C45) solanesyl diphosphate synthase from Trypanosoma cruzi (TcSPPS). We find that a lipophilic bisphosphonate (BPH-1218) inhibits T. gondii growth at low-nanomolar concentrations, while overexpression of the TgCoq1 enzyme dramatically reduced growth inhibition by the bisphosphonate. Both the severe growth defect of the mutant and the inhibition by BPH-1218 were rescued by supplementation with a long-chain (C30) ubiquinone (UQ6). Importantly, BPH-1218 also protected mice against a lethal T. gondii infection. TgCoq1 thus represents a potential drug target that could be exploited for improved chemotherapy of toxoplasmosis. IMPORTANCE Millions of people are infected with Toxoplasma gondii, and the available treatment for toxoplasmosis is not ideal. Most of the drugs currently used are only effective for the acute infection, and treatment can trigger serious side effects requiring changes in the therapeutic approach. There is, therefore, a compelling need for safe and effective treatments for toxoplasmosis. In this work, we characterize an enzyme of the mitochondrion of T. gondii that can be inhibited by an isoprenoid pathway inhibitor. We present evidence that demonstrates that inhibition of the enzyme is linked to parasite death. In addition, the inhibitor can protect mice against a lethal dose of T. gondii. Our results thus reveal a promising chemotherapeutic target for the development of new medicines for toxoplasmosis.
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- 2022
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3. Temporal and thermal profiling of the Toxoplasma proteome implicates parasite Protein Phosphatase 1 in the regulation of Ca2+-responsive pathways
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Alice L Herneisen, Zhu-Hong Li, Alex W Chan, Silvia NJ Moreno, and Sebastian Lourido
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Toxoplasma gondii ,calcium ,thermal proteome profiling ,Medicine ,Science ,Biology (General) ,QH301-705.5 - Abstract
Apicomplexan parasites cause persistent mortality and morbidity worldwide through diseases including malaria, toxoplasmosis, and cryptosporidiosis. Ca2+ signaling pathways have been repurposed in these eukaryotic pathogens to regulate parasite-specific cellular processes governing the replicative and lytic phases of the infectious cycle, as well as the transition between them. Despite the presence of conserved Ca2+-responsive proteins, little is known about how specific signaling elements interact to impact pathogenesis. We mapped the Ca2+-responsive proteome of the model apicomplexan Taxoplasma gondii via time-resolved phosphoproteomics and thermal proteome profiling. The waves of phosphoregulation following PKG activation and stimulated Ca2+ release corroborate known physiological changes but identify specific proteins operating in these pathways. Thermal profiling of parasite extracts identified many expected Ca2+-responsive proteins, such as parasite Ca2+-dependent protein kinases. Our approach also identified numerous Ca2+-responsive proteins that are not predicted to bind Ca2+, yet are critical components of the parasite signaling network. We characterized protein phosphatase 1 (PP1) as a Ca2+-responsive enzyme that relocalized to the parasite apex upon Ca2+ store release. Conditional depletion of PP1 revealed that the phosphatase regulates Ca2+ uptake to promote parasite motility. PP1 may thus be partly responsible for Ca2+-regulated serine/threonine phosphatase activity in apicomplexan parasites.
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- 2022
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4. Potent Tetrahydroquinolone Eliminates Apicomplexan Parasites
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Martin J. McPhillie, Ying Zhou, Mark R. Hickman, James A. Gordon, Christopher R. Weber, Qigui Li, Patty J. Lee, Kangsa Amporndanai, Rachel M. Johnson, Heather Darby, Stuart Woods, Zhu-hong Li, Richard S. Priestley, Kurt D. Ristroph, Scott B. Biering, Kamal El Bissati, Seungmin Hwang, Farida Esaa Hakim, Sarah M. Dovgin, Joseph D. Lykins, Lucy Roberts, Kerrie Hargrave, Hua Cong, Anthony P. Sinai, Stephen P. Muench, Jitender P. Dubey, Robert K. Prud'homme, Hernan A. Lorenzi, Giancarlo A. Biagini, Silvia N. Moreno, Craig W. Roberts, Svetlana V. Antonyuk, Colin W. G. Fishwick, and Rima McLeod
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Toxoplasma gondii ,Plasmodium falciparum ,cytochrome bc1 ,tetrahydroquinolone ,nanoformulation ,structure-guided design ,Microbiology ,QR1-502 - Abstract
Apicomplexan infections cause substantial morbidity and mortality, worldwide. New, improved therapies are needed. Herein, we create a next generation anti-apicomplexan lead compound, JAG21, a tetrahydroquinolone, with increased sp3-character to improve parasite selectivity. Relative to other cytochrome b inhibitors, JAG21 has improved solubility and ADMET properties, without need for pro-drug. JAG21 significantly reduces Toxoplasma gondii tachyzoites and encysted bradyzoites in vitro, and in primary and established chronic murine infections. Moreover, JAG21 treatment leads to 100% survival. Further, JAG21 is efficacious against drug-resistant Plasmodium falciparum in vitro. Causal prophylaxis and radical cure are achieved after P. berghei sporozoite infection with oral administration of a single dose (2.5 mg/kg) or 3 days treatment at reduced dose (0.625 mg/kg/day), eliminating parasitemia, and leading to 100% survival. Enzymatic, binding, and co-crystallography/pharmacophore studies demonstrate selectivity for apicomplexan relative to mammalian enzymes. JAG21 has significant promise as a pre-clinical candidate for prevention, treatment, and cure of toxoplasmosis and malaria.
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- 2020
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5. In Vivo Efficacy of SQ109 against Leishmania donovani, Trypanosoma spp. and Toxoplasma gondii and In Vitro Activity of SQ109 Metabolites
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Kyung-Hwa Baek, Trong-Nhat Phan, Satish R. Malwal, Hyeryon Lee, Zhu-Hong Li, Silvia N. J. Moreno, Eric Oldfield, and Joo Hwan No
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SQ109 ,in vivo ,Trypanosoma cruzi ,Trypanosoma brucei ,Leishmania donovani ,metabolites ,Biology (General) ,QH301-705.5 - Abstract
SQ109 is an anti-tubercular drug candidate that has completed Phase IIb/III clinical trials for tuberculosis and has also been shown to exhibit potent in vitro efficacy against protozoan parasites including Leishmania and Trypanosoma cruzi spp. However, its in vivo efficacy against protozoa has not been reported. Here, we evaluated the activity of SQ109 in mouse models of Leishmania, Trypanosoma spp. as well as Toxoplasma infection. In the T. cruzi mouse model, 80% of SQ109-treated mice survived at 40 days post-infection. Even though SQ109 did not cure all mice, these results are of interest since they provide a basis for future testing of combination therapies with the azole posaconazole, which acts synergistically with SQ109 in vitro. We also found that SQ109 inhibited the growth of Toxoplasma gondii in vitro with an IC50 of 1.82 µM and there was an 80% survival in mice treated with SQ109, whereas all untreated animals died 10 days post-infection. Results with Trypanosoma brucei and Leishmania donovani infected mice were not promising with only moderate efficacy. Since SQ109 is known to be extensively metabolized in animals, we investigated the activity in vitro of SQ109 metabolites. Among 16 metabolites, six mono-oxygenated forms were found active across the tested protozoan parasites, and there was a ~6× average decrease in activity of the metabolites as compared to SQ109 which is smaller than the ~25× found with mycobacteria.
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- 2022
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6. ARHGAP4 variants are associated with X-linked early-onset temporal lobe epilepsy
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Hu, Yuan-Yuan, Song, Wang, Liu, Zhi-Gang, Ye, Xing-Guang, Zhang, Hong-Wei, Li, Xin, Luo, Jun-Xia, Wang, Peng-Yu, Wang, Jie, Lin, Xiao-Fei, Zhu, Hong-Li, Liao, Wei-Ping, Li, Bin, and Chen, Xu-Qin
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- 2024
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7. CRISPR/Cas9-Induced Disruption of Paraflagellar Rod Protein 1 and 2 Genes in Trypanosoma cruzi Reveals Their Role in Flagellar Attachment
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Noelia Lander, Zhu-Hong Li, Sayantanee Niyogi, and Roberto Docampo
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Microbiology ,QR1-502 - Abstract
ABSTRACT Trypanosoma cruzi is the etiologic agent of Chagas disease, and current methods for its genetic manipulation have been highly inefficient. We report here the use of the CRISPR (clustered regularly interspaced short palindromic repeats)/Cas9 (CRISPR-associated gene 9) system for disrupting genes in the parasite by three different strategies. The utility of the method was established by silencing genes encoding the GP72 protein, which is required for flagellar attachment, and paraflagellar rod proteins 1 and 2 (PFR1, PFR2), key components of the parasite flagellum. We used either vectors containing single guide RNA (sgRNA) and Cas9, separately or together, or one vector containing sgRNA and Cas9 plus donor DNA for homologous recombination to rapidly generate mutant cell lines in which the PFR1, PFR2, and GP72 genes have been disrupted. We demonstrate that genome editing of these endogenous genes in T. cruzi is successful without detectable toxicity of Cas9. Our results indicate that PFR1, PFR2, and GP72 contribute to flagellar attachment to the cell body and motility of the parasites. Therefore, CRISPR/Cas9 allows efficient gene disruption in an almost genetically intractable parasite and suggest that this method will improve the functional analyses of its genome. IMPORTANCE Trypanosoma cruzi is the agent of Chagas disease, which affects millions of people worldwide. Vaccines to prevent this disease are not available, and drug treatments are not completely effective. The study of the biology of this parasite through genetic approaches will make possible the development of new preventive or treatment options. Previous attempts to use the CRISPR/Cas9 in T. cruzi found a detectable but low frequency of Cas9-facilitated homologous recombination and fluorescent marker swap between exogenous genes, while Cas9 was toxic to the cells. In this report, we describe new approaches that generate complete disruption of an endogenous gene without toxicity to the parasites and establish the relevance of several proteins for flagellar attachment and motility.
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- 2015
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8. Squalene synthase as a target for Chagas disease therapeutics.
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Na Shang, Qian Li, Tzu-Ping Ko, Hsiu-Chien Chan, Jikun Li, Yingying Zheng, Chun-Hsiang Huang, Feifei Ren, Chun-Chi Chen, Zhen Zhu, Melina Galizzi, Zhu-Hong Li, Carlos A Rodrigues-Poveda, Dolores Gonzalez-Pacanowska, Phercyles Veiga-Santos, Tecia Maria Ulisses de Carvalho, Wanderley de Souza, Julio A Urbina, Andrew H-J Wang, Roberto Docampo, Kai Li, Yi-Liang Liu, Eric Oldfield, and Rey-Ting Guo
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Immunologic diseases. Allergy ,RC581-607 ,Biology (General) ,QH301-705.5 - Abstract
Trypanosomatid parasites are the causative agents of many neglected tropical diseases and there is currently considerable interest in targeting endogenous sterol biosynthesis in these organisms as a route to the development of novel anti-infective drugs. Here, we report the first x-ray crystallographic structures of the enzyme squalene synthase (SQS) from a trypanosomatid parasite, Trypanosoma cruzi, the causative agent of Chagas disease. We obtained five structures of T. cruzi SQS and eight structures of human SQS with four classes of inhibitors: the substrate-analog S-thiolo-farnesyl diphosphate, the quinuclidines E5700 and ER119884, several lipophilic bisphosphonates, and the thiocyanate WC-9, with the structures of the two very potent quinuclidines suggesting strategies for selective inhibitor development. We also show that the lipophilic bisphosphonates have low nM activity against T. cruzi and inhibit endogenous sterol biosynthesis and that E5700 acts synergistically with the azole drug, posaconazole. The determination of the structures of trypanosomatid and human SQS enzymes with a diverse set of inhibitors active in cells provides insights into SQS inhibition, of interest in the context of the development of drugs against Chagas disease.
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- 2014
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9. Toxoplasma gondii relies on both host and parasite isoprenoids and can be rendered sensitive to atorvastatin.
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Zhu-Hong Li, Srinivasan Ramakrishnan, Boris Striepen, and Silvia N J Moreno
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Immunologic diseases. Allergy ,RC581-607 ,Biology (General) ,QH301-705.5 - Abstract
Intracellular pathogens have complex metabolic interactions with their host cells to ensure a steady supply of energy and anabolic building blocks for rapid growth. Here we use the obligate intracellular parasite Toxoplasma gondii to probe this interaction for isoprenoids, abundant lipidic compounds essential to many cellular processes including signaling, trafficking, energy metabolism, and protein translation. Synthesis of precursors for isoprenoids in Apicomplexa occurs in the apicoplast and is essential. To synthesize longer isoprenoids from these precursors, T. gondii expresses a bifunctional farnesyl diphosphate/geranylgeranyl diphosphate synthase (TgFPPS). In this work we construct and characterize T. gondii null mutants for this enzyme. Surprisingly, these mutants have only a mild growth phenotype and an isoprenoid composition similar to wild type parasites. However, when extracellular, the loss of the enzyme becomes phenotypically apparent. This strongly suggests that intracellular parasite salvage FPP and/or geranylgeranyl diphosphate (GGPP) from the host. We test this hypothesis using inhibitors of host cell isoprenoid synthesis. Mammals use the mevalonate pathway, which is susceptible to statins. We document strong synergy between statin treatment and pharmacological or genetic interference with the parasite isoprenoid pathway. Mice can be cured with atorvastatin (Lipitor) from a lethal infection with the TgFPPs mutant. We propose a double-hit strategy combining inhibitors of host and parasite pathways as a novel therapeutic approach against Apicomplexan parasites.
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- 2013
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10. Modified Inverse PCR Method for Cloning the Flanking Sequences from Human Cell Pools
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Zhu-Hong Li, De-Pei Liu, and Chih-Chuan Liang
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Biology (General) ,QH301-705.5 - Published
- 1999
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11. Umbrella boronyl cluster B10O: A new candidate for the transition-metal-like bonding model of boron
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Zhu, Hong-Li, Jin, Bo, Feng, Lin-Yan, Yan, Miao, Qiao, Yong-Sheng, Shen, La-Zhen, and Wang, Ying-Jin
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- 2024
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12. Through virtual saturation mutagenesis and rational design for superior substrate conversion in engineered d‐amino acid oxidase.
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Tang, Heng, Zhu, Hong‐Li, Zhao, Jin‐Qiao, Wang, Liu‐Yu, Xue, Ya‐Ping, and Zheng, Yu‐Guo
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- 2024
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13. Diffusion-driven Ca-Fe isotope fractionations in the upper mantle: Implications for mantle cooling and melt infiltration
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Kang, Jin-Ting, Zhou, Chen, Huang, Jing-Yi, Hao, Yan-Tao, Liu, Fang, Zhu, Hong-Li, Zhang, Zhao-Feng, and Huang, Fang
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- 2020
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14. Downregulation of lncRNA ZFAS1 and upregulation of microRNA-129 repress endocrine disturbance, increase proliferation and inhibit apoptosis of ovarian granulosa cells in polycystic ovarian syndrome by downregulating HMGB1
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Zhu, Hong-li, Chen, Yue-qun, and Zhang, Zhi-fen
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- 2020
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15. Recent progresses in plate subduction and element recycling
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Li, Cong-Ying, Sun, Sai-Jun, Guo, Xuan, and Zhu, Hong-Li
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- 2020
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16. Calcium isotope sources and fractionation during melt-rock interaction in the lithospheric mantle: Evidence from pyroxenites, wehrlites, and eclogites
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Kang, Jin-Ting, Ionov, Dmitri A., Zhu, Hong-Li, Liu, Fang, Zhang, Zhao-Feng, Liu, Zhe, and Huang, Fang
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- 2019
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17. Chinese guidelines for treatment of adult primary immune thrombocytopenia
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Liu, Xin-guang, Bai, Xiao-chuan, Chen, Fang-ping, Cheng, Yun-feng, Dai, Ke-sheng, Fang, Mei-yun, Feng, Jian-Ming, Gong, Yu-ping, Guo, Tao, Guo, Xin-hong, Han, Yue, Hong, Luo-jia, Hu, Yu, Hua, Bao-lai, Huang, Rui-bing, Li, Yan, Peng, Jun, Shu, Mi-mi, Sun, Jing, Sun, Pei-yan, Sun, Yu-qian, Wang, Chun-sen, Wang, Shu-jie, Wang, Xiao-min, Wu, Cong-ming, Wu, Wen-man, Yan, Zhen-yu, Yang, Feng-e, Yang, Lin-hua, Yang, Ren-Chi, Yang, Tong-hua, Ye, Xu, Zhang, Guang-sen, Zhang, Lei, Zheng, Chang-cheng, Zhou, Hu, Zhou, Min, Zhou, Rong-fu, Zhou, Ze-ping, Zhu, Hong-li, Zhu, Tie-nan, and Hou, Ming
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- 2018
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18. Efficient Production of 3‐amino‐2‐hydroxy Acetophenone by Multi‐enzyme Biosynthesis
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Tang, Heng, primary, Zhu, Hong-Li, additional, Zhong, Jin-Xing, additional, Wang, Meng-Nan, additional, Xue, Ya-Ping, additional, and Zheng, Yu-Guo, additional
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- 2023
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19. Calcium isotopic composition of mantle xenoliths and minerals from Eastern China
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Kang, Jin-Ting, Zhu, Hong-Li, Liu, Yu-Fei, Liu, Fang, Wu, Fei, Hao, Yan-Tao, Zhi, Xia-Chen, Zhang, Zhao-Feng, and Huang, Fang
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- 2016
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20. Effect of chromosomal polymorphisms on reproductive outcomes of in vitro fertilization-embryo transfer.
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ZHAN Xu-xin, ZHU Hong-li, ZHANG Xiang, and XIE Jin-xia
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- 2023
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21. Author response: Temporal and thermal profiling of the Toxoplasma proteome implicates parasite Protein Phosphatase 1 in the regulation of Ca2+-responsive pathways
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Alice L Herneisen, Zhu-Hong Li, Alex W Chan, Silvia NJ Moreno, and Sebastian Lourido
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- 2022
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22. Observer-based feedback stabilization of a reaction-diffusion equation with variable coefficients and boundary input delay
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Zhu, Hong-Li, primary and Xu, Gen-Qi, additional
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- 2022
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23. De novo mapping of the apicomplexan Ca2+-responsive proteome
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Alice L. Herneisen, Zhu-Hong Li, Alex W. Chan, Silvia NJ Moreno, and Sebastian Lourido
- Abstract
Apicomplexan parasites cause persistent mortality and morbidity worldwide through diseases including malaria, toxoplasmosis, and cryptosporidiosis. Ca2+ signaling pathways have been repurposed in these eukaryotic pathogens to regulate parasite-specific cellular processes governing the transition between the replicative and lytic phases of the infectious cycle. Despite the presence of conserved Ca2+-responsive proteins, little is known about how specific signaling elements interact to impact pathogenesis. We mapped the Ca2+-responsive proteome of the model apicomplexan T. gondii via time-resolved phosphoproteomics and thermal proteome profiling. The waves of phosphoregulation following PKG activation and stimulated Ca2+ release corroborate known physiological changes but identify specific proteins operating in these pathways. Thermal profiling of parasite extracts identified many expected Ca2+-responsive proteins, such as parasite Ca2+-dependent protein kinases. Our approach also identified numerous Ca2+-responsive proteins that are not predicted to bind Ca2+, yet are critical components of the parasite signaling network. We characterized protein phosphatase 1 (PP1) as a Ca2+-responsive enzyme that relocalized to the parasite apex upon Ca2+ store release. Conditional depletion of PP1 revealed that the phosphatase regulates Ca2+ uptake to promote parasite motility. PP1 may thus be partly responsible for Ca2+-regulated serine/threonine phosphatase activity in apicomplexan parasites.
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- 2022
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24. Meta-Analysis of Bushen Huoxue Method in the Treatment of Recurrent Spontaneous Abortion Due to Prethrombotic State
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Pu, Rong-Feng, primary, Li, Nan, additional, Zhu, Hong-Li, additional, Bai, Jun, additional, and Chen, Mei, additional
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- 2022
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25. A plastid two-pore channel essential for inter-organelle communication and growth of Toxoplasma gondii
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Stephen A. Vella, Lawrence Ayong, Isabelle Coppens, Silvia N. J. Moreno, Xinjiang Cai, Thayer P. King, Beejan Asady, Taufiq Rahman, Zhu Hong Li, Sandip Patel, Li, Zhu-Hong [0000-0003-4940-0729], Cai, Xinjiang [0000-0001-8933-7133], Rahman, Taufiq [0000-0003-3830-5160], Vella, Stephen A [0000-0002-0626-8708], Patel, Sandip [0000-0001-7247-2013], Moreno, Silvia N J [0000-0002-2041-6295], Apollo - University of Cambridge Repository, Vella, Stephen A. [0000-0002-0626-8708], Moreno, Silvia N. J. [0000-0002-2041-6295], and Moreno, Silvia NJ [0000-0002-2041-6295]
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631/80/86/1999 ,Mutant ,Protozoan Proteins ,General Physics and Astronomy ,96/35 ,96/34 ,Endoplasmic Reticulum ,13/1 ,38/1 ,Parasite physiology ,14/19 ,Phylogeny ,Calcium signaling ,631/326/417/2552 ,Multidisciplinary ,Organelle Biogenesis ,biology ,Chemistry ,Calcium signalling ,45/77 ,Foodborne Illness ,Membrane contact site ,humanities ,Cell biology ,13/31 ,Two-pore channel ,Infectious Diseases ,147/143 ,Toxoplasma ,Biotechnology ,631/80/642 ,Science ,1.1 Normal biological development and functioning ,13/106 ,45/23 ,Apicoplasts ,Article ,General Biochemistry, Genetics and Molecular Biology ,Apicomplexa ,Vaccine Related ,14/34 ,Underpinning research ,Biodefense ,parasitic diseases ,Organelle ,Humans ,Calcium Signaling ,Amino Acid Sequence ,Plastid ,14/35 ,Organelles ,Apicoplast ,Prevention ,General Chemistry ,DNA ,biology.organism_classification ,Emerging Infectious Diseases ,14/63 ,Mutation ,14/28 ,Calcium ,Calcium Channels - Abstract
Funder: U.S. Department of Health & Human Services | National Institutes of Health (NIH), Funder: U.S. Department of Health & Human Services | NIH | National Institute of Allergy and Infectious Diseases (NIAID), Two-pore channels (TPCs) are a ubiquitous family of cation channels that localize to acidic organelles in animals and plants to regulate numerous Ca2+-dependent events. Little is known about TPCs in unicellular organisms despite their ancient origins. Here, we characterize a TPC from Toxoplasma gondii, the causative agent of toxoplasmosis. TgTPC is a member of a novel clad of TPCs in Apicomplexa, distinct from previously identified TPCs and only present in coccidians. We show that TgTPC localizes not to acidic organelles but to the apicoplast, a non-photosynthetic plastid found in most apicomplexan parasites. Conditional silencing of TgTPC resulted in progressive loss of apicoplast integrity, severely affecting growth and the lytic cycle. Isolation of TPC null mutants revealed a selective role for TPCs in replication independent of apicoplast loss that required conserved residues within the pore-lining region. Using a genetically-encoded Ca2+ indicator targeted to the apicoplast, we show that Ca2+ signals deriving from the ER but not from the extracellular space are selectively transmitted to the lumen. Deletion of the TgTPC gene caused reduced apicoplast Ca2+ uptake and membrane contact site formation between the apicoplast and the ER. Fundamental roles for TPCs in maintaining organelle integrity, inter-organelle communication and growth emerge.
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- 2021
26. Lipid Transporters: From Bacteria, Protozoa, Fungi and Plants, to Mice and Men
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Eric Oldfield, Joo Hwan No, Silvia N. J. Moreno, Zhu-Hong Li, Hyeryon Lee, Trong-Nhat Phan, Kyung-Hwa Baek, and Satish Malwal
- Abstract
The tuberculosis drug candidate SQ109 targets the trehalose monomycolate transporter MmpL3 in Mycobacterium tuberculosis and also has activity against other pathogens. We found related proteins in 22 protozoa, including Trypanosoma cruzi and Entamoeba histolytica, as well as in archaea and other bacteria, including the fatty acid transporter, FarE. We show these proteins, alpha-MMPL proteins, adopt similar structures to that of MsMmpL3 having two sets (P1 and P2) of conserved active site/H+-transporter Asp, Tyr and Phe residues in “pentad” motifs (DYxxF) that can bind to the SQ109 ethylenediamine and adamantyl moieties. Based on structural comparisons with MsMmpL3, we find that there are superimposable transmembrane and H+-transporter structures in much larger proteins, beta-MMPLs, found in apicomplexan parasites, fungi, plants and animals. They also contain double “pentad” motifs in which the P1 Asp is totally conserved, but the P2 Asp may also be a Glu, and the P2 Phe seen in the alpha-MMPLs is a His that H-bonds to the P1 and P2 Asp/Glu residues. There are also 5 conserved Ser/Thr residues that extend the H-bond/H+-transporter network with 2 interacting directly with the P1 Asp, and the His. We propose that all MMPL proteins are involved in proton motive force-mediated lipid (phospholipid, glycolipid, sterol, fatty acid) transport, and that SQ109 may target some pathogens directly, by binding to the P1/P2 motifs. Overall, the results are of general interest since they indicate that there are two major classes of lipid transporters: alpha-MMPL proteins found in many bacteria and protozoa, and much larger, beta-MMPL proteins, found in fungi, apicomplexa, plants and animals and, in some cases, they are potential drug targets.
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- 2021
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27. Individualized Fludarabine-Based Regimen in Elderly Patients with Chronic Lymphocytic Leukemia/Small Lymphocytic Lymphoma
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Guo, Bo, Zhu, Hong-Li, Fan, Hui, Li, Su-Xia, Lu, Xue-Chun, Lin, Jie, Ran, Hai-Hong, Zhai, Bing, and Yang, Yang
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- 2012
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28. Clinical Study of Autologous Cytokine-Induced Killer Cells for the Treatment of Elderly Patients with Diffuse Large B-Cell Lymphoma
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Lu, Xue-chun, Yang, Bo, Yu, Rui-li, Chi, Xiao-hua, Tuo, Shuai, Tuo, Chao-wei, Zhu, Hong-li, Wang, Yao, Jiang, Chao-guang, Fu, Xiao-bing, Yang, Yang, Liu, Yang, Yao, Shan-qian, Dai, Han-ren, Cai, Li-li, Li, Bing-jun, and Han, Wei-dong
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- 2012
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29. Successful management of acute myeloid leukemia transformed from myelodysplastic syndromes in an elderly patient aged over 80 years old by ultralow dose decitabine combined with amifostine and autologous CIK cells
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Yang, Bo, Wang, Hai-tao, Cai, Li-li, Zhao, Yu, Chi, Xiao-hua, Zhu, Hong-li, Ran, Hai-hong, Yang, Yang, Yu, Rui-li, Li, Song-wei, and Lu, Xue-chun
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- 2014
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30. Efficacy of Amifostine in Treating Patients with Idiopathic Thrombocytopenia Purpura
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Fan, Hui, Zhu, Hong-Li, Li, Su-Xia, Lu, Xue-Chun, Zhai, Bing, Guo, Bo, Yao, Shan-Qian, and Liu, Yang
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- 2011
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31. Crystal structures, bioactivities and fluorescent properties of four diverse complexes with a new symmetric benzimidazolic ligand
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Guo, Chun-Yan, Wang, Yao-Yu, Xu, Kang-Zhen, Zhu, Hong-Li, Liu, Ping, Shi, Qi-Zhen, and Peng, Shie-Ming
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- 2008
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32. An Improved Method for the Separation and Quantification of Major Phospholipid Classes by LC-ELSD
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Yan, Kun-Ping, Zhu, Hong-Li, Dan, Ning, and Chen, Chao
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- 2010
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33. Temporal and thermal profiling of the Toxoplasma proteome implicates parasite Protein Phosphatase 1 in the regulation of Ca2+-responsive pathways.
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Herneisen, Alice L., Zhu-Hong Li, Chan, Alex W., Moreno, Silvia N. J., and Lourido, Sebastian
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PHOSPHOPROTEIN phosphatases , *PARASITES , *TOXOPLASMA , *PROTEIN kinases , *CRYPTOSPORIDIOSIS , *CELLULAR signal transduction , *MALARIA - Abstract
Apicomplexan parasites cause persistent mortality and morbidity worldwide through diseases including malaria, toxoplasmosis, and cryptosporidiosis. Ca2+ signaling pathways have been repurposed in these eukaryotic pathogens to regulate parasite-specific cellular processes governing the replicative and lytic phases of the infectious cycle, as well as the transition between them. Despite the presence of conserved Ca2+-responsive proteins, little is known about how specific signaling elements interact to impact pathogenesis. We mapped the Ca2+-responsive proteome of the model apicomplexan Taxoplasma gondii via time-resolved phosphoproteomics and thermal proteome profiling. The waves of phosphoregulation following PKG activation and stimulated Ca 2+ release corroborate known physiological changes but identify specific proteins operating in these pathways. Thermal profiling of parasite extracts identified many expected Ca2+-responsive proteins, such as parasite Ca2+-dependent protein kinases. Our approach also identified numerous Ca2+- responsive proteins that are not predicted to bind Ca2+, yet are critical components of the parasite signaling network. We characterized protein phosphatase 1 (PP1) as a Ca2+-responsive enzyme that relocalized to the parasite apex upon Ca2+ store release. Conditional depletion of PP1 revealed that the phosphatase regulates Ca2+ uptake to promote parasite motility. PP1 may thus be partly responsible for Ca2+-regulated serine/threonine phosphatase activity in apicomplexan parasites. [ABSTRACT FROM AUTHOR]
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- 2022
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34. Multi-target heteroleptic palladium bisphosphonate complexes
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Dinorah Gambino, Claudio Olea Azar, Santiago Rostán, Roberto Docampo, Ulrike Kemmerling, Susana B. Etcheverry, Micaella Cipriani, Zhu-Hong Li, Jorge S. Gancheff, Lucía Otero, and Ignacio E. León
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Antiparasitic ,medicine.drug_class ,Trypanosoma cruzi ,Phenanthroline ,Biología ,Intercalation (chemistry) ,010402 general chemistry ,01 natural sciences ,Biochemistry ,Inorganic Chemistry ,chemistry.chemical_compound ,Farnesyl diphosphate synthase ,Parasitic Sensitivity Tests ,Coordination Complexes ,medicine ,Bisphosphonate ,chemistry.chemical_classification ,Diphosphonates ,Molecular Structure ,biology ,010405 organic chemistry ,Ligand ,Chemistry ,Química ,DNA ,Trypanocidal Agents ,Combinatorial chemistry ,In vitro ,0104 chemical sciences ,Enzyme ,Chagas ,biology.protein ,Palladium ,Toxoplasmosis - Abstract
Bisphosphonates are the most commonly prescribed drugs for the treatment of osteoporosis and other bone illnesses. Some of them have also shown antiparasitic activity. In search of improving the pharmacological profile of commercial bisphosphonates, our group had previously developed first row transition metal complexes with N-containing bisphosphonates (NBPs). In this work, we extended our studies to heteroleptic palladium–NBP complexes including DNA intercalating polypyridyl co-ligands (NN) with the aim of obtaining potential multi-target species. Complexes of the formula [Pd(NBP)₂(NN)]·2NaCl·xH₂O with NBP = alendronate (ale) or pamidronate (pam) and NN = 1,10 phenanthroline (phen) or 2,2′-bipyridine (bpy) were synthesized and fully characterized. All the obtained compounds were much more active in vitro against T. cruzi (amastigote form) than the corresponding NBP ligands. In addition, complexes were nontoxic to mammalian cells up to 50–100 µM. Compounds with phen as ligand were 15 times more active than their bpy analogous. Related to the potential mechanism of action, all complexes were potent inhibitors of two parasitic enzymes of the isoprenoid biosynthetic pathway. No correlation between the anti-T. cruzi activity and the enzymatic inhibition results was observed. On the contrary, the high antiparasitic activity of phen-containing complexes could be related to their ability to interact with DNA in an intercalative-like mode. These rationally designed compounds are good candidates for further studies and good leaders for future drug developments. Four new palladium heteroleptic complexes with N-containing commercial bisphosphonates and DNA intercalating polypyridyl co-ligands were synthesized and fully characterized. All complexes displayed high anti-T. cruzi activity which could be related to the inhibition of the parasitic farnesyl diphosphate synthase enzyme but mainly to their ability to interact DNA., Centro de Química Inorgánica
- Published
- 2020
35. The Role of Potassium and Host Calcium Signaling inToxoplasma gondiiegress
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Miryam Andrea Hortua Triana, Stephen A. Vella, Christina A. Moore, Evgeniy Potapenko, Zhu-Hong Li, and Silvia N.J. Moreno
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0303 health sciences ,biology ,Chemistry ,Intracellular parasite ,030302 biochemistry & molecular biology ,Toxoplasma gondii ,biology.organism_classification ,Cell biology ,Microneme ,03 medical and health sciences ,Cytosol ,Cytoplasm ,Extracellular ,Secretion ,Intracellular ,030304 developmental biology - Abstract
Toxoplasma gondii , an obligate intracellular parasite, is capable of invading virtually any nucleated cell. Active invasion by the parasite is a precise process and intracellular parasites reside and replicate inside a parasitophorous vacuole (PV). The membrane of the PV functions as a molecular sieve allowing for its ionic milieu to be in equilibrium with the host cytosol. The parasite would thus be exposed to the ionic fluctuations of the host cytoplasm, such as increases in host cytosolic Ca2+ during Ca2+ signaling events. Ca2+ is a universal signaling molecule and both the host cell and T. gondii will utilize Ca2+ signaling to stimulate diverse cellular functions. Using T. gondii tachyzoites and host cells expressing genetically encoded Ca2+ indicators, we demonstrate that host Ca2+ signaling impacts intracellular Ca2+ levels of the parasite. We propose that Ca2+ influx derived from host Ca2+ signaling into the parasite is utilized to maintain the intracellular Ca2+ stores replenished as the parasite replicates within the low Ca2+ environment of the host cell. Intracellular Ca2+ store(s) release is needed to reach the initiation spike in Ca2+ that meets the threshold of Ca2+ needed to initiate the tightly coordinated process of egress. Post activation of the signal and subsequent microneme secretion, would cause breakdown of the host cell and allow for extracellular Ca2+ influx, causing a second, larger spike in Ca2+ and activation of the glideosome, the main motility machinery. To directly deliver precise concentrations of ions needed for egress, we used patch-clamped infected host cells and monitored parasite egress. In doing so, we discovered an alternative role for K+ in timing parasite egress. This is the first study using whole-cell patch clamp to study the role of ions such as K+ and Ca2+ in T. gondii egress.
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- 2020
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36. Genetic tool development in marine protists: Emerging model organisms for experimental cell biology
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Deepak Nanjappa, Iñaki Ruiz-Trillo, Christopher J. Howe, Chris Bowler, Mariusz Nowacki, Anastasios D. Tsaousis, Noelia Lander, Christopher L. Dupont, Shinichiro Maruyama, Fulei Luan, Andrew E. Allen, Anna M. G. Novák Vanclová, Pamela A. Silver, Nastasia J. Freyria, Peter von Dassow, Elisabeth Hehenberger, Konomi Fujimura-Kamada, Julius Lukeš, Roberto Docampo, Deborah L. Robertson, Thomas E. Clemente, Sebastián R. Najle, Kathryn J. Coyne, Cristina Aresté, Brittany N. Sprecher, Lu Wang, Eleanna Kazana, Verónica Freire-Benéitez, Vladimír Hampl, Cecilia Balestreri, Isabel C. Nimmo, Mariana Rius, Yoshihisa Hirakawa, Arnab Pain, Jorge Ibañez, Elin Einarsson, Lev Tsypin, Heriberto Cerutti, Adrian C. Barbrook, G. Jason Smith, Alexandra Z. Worden, Jian Guo, Jean Claude Lozano, Virginia P. Edgcomb, Huan Zhang, Andrea Highfield, Isaac Núñez, Fatma Gomaa, Jan Pyrih, Natalia Ewa Janowicz, Sara J. Bender, Ross F. Waller, Tobias von der Haar, François-Yves Bouget, Matus Valach, Amanda Hopes, Luke M. Noble, Paulo A. Garcia, Nicholas A.T. Irwin, Tamara Matute, Jernej Turnšek, Ian Hu, Sandra Pucciarelli, Fernán Federici, Valérie Vergé, R. Ellen R. Nisbet, Miguel Angel Chiurillo, Mark Moosburner, Monika Abedin Sigg, Aaron P. Turkewitz, Albane Ruaud, Angela Piersanti, Sebastian G. Gornik, Peter R. Girguis, Adam C. Jones, Lawrence A. Klobutcher, Claudio H. Slamovits, Elena Casacuberta, Imen Lassadi, Elizabeth C. Cooney, Kodai Fukuda, Nicole King, Manuel Ares, Jonathan Z. Kaye, Lisa Sudek, Patrick Beardslee, Cristina Miceli, Xiaoxue Wen, Estienne C. Swart, Yuu Ishii, Ambar Kachale, Pia A. Elustondo, Esteban R. Haro-Contreras, Patrick J. Keeling, José A. Fernández Robledo, Glen L. Wheeler, Colin Brownlee, Rowena Stern, Joshua S. Rest, Susana A. Breglia, Senjie Lin, Duncan B. Coles, Jackie L. Collier, Drahomíra Faktorová, David S. Booth, April Woods, Binnypreet Kaur, Thomas Mock, Gertraud Burger, Jun Minagawa, Yutaka Hanawa, Zhu-Hong Li, Rachele Cesaroni, Laboratoire d'Océanographie Microbienne (LOMIC), Centre National de la Recherche Scientifique (CNRS)-Sorbonne Université (SU)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire océanologique de Banyuls (OOB), Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS), Faktorová, Drahomíra [0000-0001-9623-2233], Nisbet, R. Ellen R. [0000-0003-4487-196X], Allen, Andrew E. [0000-0001-5911-6081], Ares, Manuel, Jr [0000-0002-2552-9168], Bowler, Chris [0000-0003-3835-6187], Burger, Gertraud [0000-0002-8679-8812], Collier, Jackie L. [0000-0001-8774-5715], Cooney, Elizabeth C. [0000-0001-7435-7609], Docampo, Roberto [0000-0003-4229-8784], Dupont, Christopher L. [0000-0002-0896-6542], Edgcomb, Virginia [0000-0001-6805-381X], Freyria, Nastasia J. [0000-0002-4972-9383], Gornik, Sebastian G. [0000-0002-8026-1336], Howe, Christopher J. [0000-0002-6975-8640], Hu, Ian [0000-0002-2287-031X], Ishii, Yuu [0000-0003-1735-9557], Jones, Adam C. [0000-0001-7521-1863], Lin, Senjie [0000-0001-8831-6111], Maruyama, Shinichiro [0000-0002-1128-5916], Minagawa, Jun [0000-0002-3028-3203], Najle, Sebastián R. [0000-0002-0654-9147], Nowacki, Mariusz [0000-0003-4894-2905], Pain, Arnab [0000-0002-1755-2819], Silver, Pamela A. [0000-0002-7856-4071], Jason Smith, G. [0000-0003-1258-4800], Sprecher, Brittany N. [0000-0001-5032-3834], Tsaousis, Anastasios D. [0000-0002-5424-1905], Tsypin, Lev [0000-0002-0642-8468], Turkewitz, Aaron [0000-0003-3531-5806], Turnšek, Jernej [0000-0002-9056-3565], Valach, Matus [0000-0001-8689-0080], von der Haar, Tobias [0000-0002-6031-9254], Mock, Thomas [0000-0001-9604-0362], Worden, Alexandra Z. [0000-0002-9888-9324], Lukeš, Julius [0000-0002-0578-6618], Apollo - University of Cambridge Repository, Nisbet, R Ellen R [0000-0003-4487-196X], Allen, Andrew E [0000-0001-5911-6081], Ares, Manuel [0000-0002-2552-9168], Collier, Jackie L [0000-0001-8774-5715], Cooney, Elizabeth C [0000-0001-7435-7609], Dupont, Christopher L [0000-0002-0896-6542], Freyria, Nastasia J [0000-0002-4972-9383], Gornik, Sebastian G [0000-0002-8026-1336], Howe, Christopher J [0000-0002-6975-8640], Jones, Adam C [0000-0001-7521-1863], Najle, Sebastián R [0000-0002-0654-9147], Silver, Pamela A [0000-0002-7856-4071], Jason Smith, G [0000-0003-1258-4800], Sprecher, Brittany N [0000-0001-5032-3834], Tsaousis, Anastasios D [0000-0002-5424-1905], Worden, Alexandra Z [0000-0002-9888-9324], Gordon and Betty Moore Foundation, Leverhulme Trust, Ministry of Education, Youth and Sports (Czech Republic), and European Commission
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Resource ,Molecular biology ,Range (biology) ,Tree of life (biology) ,[SDV]Life Sciences [q-bio] ,Green Fluorescent Proteins ,ved/biology.organism_classification_rank.species ,Marine Biology ,Environment ,Diversification (marketing strategy) ,Biology ,Models, Biological ,Biochemistry ,Genome ,03 medical and health sciences ,Transformation, Genetic ,0302 clinical medicine ,Species Specificity ,Genome editing ,631/1647/767/722 ,Ecosystem ,14. Life underwater ,Model organism ,Molecular Biology ,ComputingMilieux_MISCELLANEOUS ,030304 developmental biology ,0303 health sciences ,Dna delivery ,030306 microbiology ,ved/biology ,Cellular pathways ,Eukaryota ,Genetic systems ,Biodiversity ,DNA ,Cell Biology ,Genetic models ,biology.organism_classification ,Cell biology ,QR ,Transformation (genetics) ,Eukaryote ,030217 neurology & neurosurgery ,631/337 ,Biotechnology - Abstract
Diverse microbial ecosystems underpin life in the sea. Among these microbes are many unicellular eukaryotes that span the diversity of the eukaryotic tree of life. However, genetic tractability has been limited to a few species, which do not represent eukaryotic diversity or environmentally relevant taxa. Here, we report on the development of genetic tools in a range of protists primarily from marine environments. We present evidence for foreign DNA delivery and expression in 13 species never before transformed and for advancement of tools for eight other species, as well as potential reasons for why transformation of yet another 17 species tested was not achieved. Our resource in genetic manipulation will provide insights into the ancestral eukaryotic lifeforms, general eukaryote cell biology, protein diversification and the evolution of cellular pathways., This collaborative effort was supported by the Gordon and Betty Moore Foundation EMS Program of the Marine Microbiology Initiative (grant nos. GBMF4972 and 4972.01 to F.-Y.B.; GBMF4970 and 4970.01 to M.A. and A.Z.W.; GBMF3788 to A.Z.W.; GBMF 4968 and 4968.01 to H.C.; GBMF4984 to V.H.; GBMF4974 and 4974.01 to C. Brownlee; GBMF4964 to Y. Hirakawa; GBMF4961 to T. Mock; GBMF4958 to P.S.; GBMF4957 to A.T.; GBMF4960 to G.J.S.; GBMF4979 to K.C.; GBMF4982 and 4982.01 to J.L.C.; GBMF4964 to P.J.K.; GBMF4981 to P.v.D.; GBMF5006 to A.E.A.; GBMF4986 to C.M.; GBMF4962 to J.A.F.R.; GBMF4980 and 4980.01 to S.L.; GBMF 4977 and 4977.01 to R.F.W.; GBMF4962.01 to C.H.S.; GBMF4985 to J.M.; GBMF4976 and 4976.01 to C.H.; GBMF4963 and 4963.01 to V.E.; GBMF5007 to C.L.D.; GBMF4983 and 4983.01 to J.L.; GBMF4975 and 4975.01 to A.D.T.; GBMF4973 and 4973.01 to I.R.-T. and GBMF4965 to N.K.), by The Leverhulme Trust (RPG-2017-364) to T. Mock and A. Hopes, and by ERD funds (16_019/0000759) from the Czech Ministry of Education to J.L.
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- 2020
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37. Comparison and analysis of dry mixed mortar and traditional shotcrete and equipment development scheme
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Li, Xu, primary, Zhu, Hong li, additional, Jing, Wen qing, additional, and Cheng, Guo qiang, additional
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- 2021
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38. Diagnosis and Treatment of Rituximab-Induced Acute Tumor Lysis Syndrome in Patients With Diffuse Large B-Cell Lymphoma
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Yang, Bo, Lu, Xue-Chun, Yu, Rui-Li, Chi, Xiao-Hua, Zhang, Wen-Ying, Zhu, Hong-Li, Yuan, Jing, and Zhao, Po
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- 2012
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39. Treatment for orbital diffuse large B-cell lymphoma in an elderly patient by autologous cytokine-induced killer cells
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Li, Su-Xia, Zhu, Hong-Li, Guo, Bo, Lu, Xue-Chun, Yang, Bo, Liu, Yang, Han, Wei-Dong, Wang, Yao, and Yao, Shan-Qian
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- 2012
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40. Individualized Liposomal Doxorubicin-Based Treatment in Elderly Patients with Non-Hodgkinʼs Lymphoma
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Guo, Bo, Zhu, Hong-Li, Li, Su-Xia, Lu, Xue-Chun, and Fan, Hui
- Published
- 2011
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41. The Mg Isotopic Characteristics of Basalts from the South China Sea and their Geodynamics Implications
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Liao, Ren-Qiang, primary, Zhu, Hong-Li, additional, and Sun, Weidongsun, additional
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- 2020
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42. Analysis of Mini-LED light-off phenomenon based on FEM simulation
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LIU Shuo, 刘 硕, primary, WU Jen-chieh, 吴仁杰, additional, YANG Xian, 杨 贤, additional, LIU Yang, 刘 阳, additional, MA Ke, 马 可, additional, ZHU Hong-li, 朱红丽, additional, ZHOU Hao, 周 昊, additional, and SUN Hai-wei, 孙海威, additional
- Published
- 2020
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43. Genetic Indicators for Calcium Signaling Studies in Toxoplasma gondii
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Silvia N. J. Moreno, Zhu-Hong Li, Stephen A. Vella, Beejan Asady, and Abigail Calixto
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Cytoplasm ,Protozoan Proteins ,chemistry.chemical_element ,Calcium ,Biology ,Article ,Host-Parasite Interactions ,03 medical and health sciences ,Cytosol ,Animals ,Humans ,Calcium Signaling ,030304 developmental biology ,Calcium signaling ,0303 health sciences ,Ionophores ,Intracellular parasite ,030302 biochemistry & molecular biology ,Toxoplasma gondii ,Transfection ,biology.organism_classification ,Cell biology ,chemistry ,Toxoplasma ,Homeostasis - Abstract
Fluctuations of the cytosolic calcium ion (Ca2+) concentration regulate a variety of cellular functions in all eukaryotes. Cells express a sophisticated set of mechanisms to balance the cytosolic Ca2+ levels and the signals that elevate Ca2+ in the cytosol are compensated by mechanisms that reduce it. Alterations in Ca2+-dependent homeostatic mechanisms are the cause of many prominent diseases in humans, such as heart failure or neuronal death.The genetic tractability of Toxoplasma gondii and the availability of genetic tools enabled the use of Genetically Encoded Calcium Indicators (GECIs) expressed in the cytoplasm, which started a new era in the studies of Toxoplasma calcium signaling. It was finally possible to see Ca2+ oscillations prior to exit of the parasite from host cells. Years after Endo et al showed that ionophores triggered egress, the assumption that oscillations occur prior to egress from host cells has been validated by experiments using GECIs. GECIs allowed the visualization of specific Ca2+ signals in live intracellular parasites and to distinguish these signals from host cell calcium fluctuations. In this chapter we present an overview describing "tried and true" methods of our lab who pioneered the first use of GECI's in Toxoplasma, including GECI choice, methodology for transfection and selection of ideal clones, their characterization, and the use of GECI-expressing parasites for fluorometric and microscopic analysis.
- Published
- 2019
44. Purification of recombinant SaCas9 protein v1
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Zhu-Hong Li, Fatma Gomaa, David Beaudoin, Virginia Edgcomb, and Roberto Docampo
- Abstract
1, Preparation of Terrific Broth 800 mL distilled H2O 12g Tryptone 24g Yeast extract 4 mL Glycerol Bring volume up to 900 mL with distilled H2O Autoclave and cool to room temperature Bring volume to 1000 mL with 100 mL filter sterilized solution containing 0.17M KH2PO4(2.314g – Potassium phosphate monobasic) 0.72M K2HPO4(16.43g – Potassium phosphate dibasic trihydrate) 2, Cells Rosetta-gami 2 cells expressing SaCas9 on pET32/Lic vector. Protein Expression Grow 10 mL starter culture overnight at 37°C (LB is fine) Inoculate 1 mL in 100 mL of Terrific Broth the next morning O.D. should be between 0.2 and 0.5 after 3 hours – if higher discard culture When O.D. is between 0.5 and 0.7 induce with IPTG and move o 18°C – grow overnight The next morning spin down and purify 3, Protein Purification Binding Buffer - 1 L - pH 8.0 Elution Buffer - 200 mL - pH 8.0 Lysis buffer 40 mL biding buffer 1 EDTA-free Protease Inhibitor pellet 300 mL P8849 500 mL lysozyme 10 mL DNase 10 mL RNase - Resuspend the pellet in 12 ml Lysis buffer - 1 hour on ice at 4°C - 80 seconds 30% sonication in 10 mL aliquotes (10 seconds on, 10 seconds off) - 12,000 rpm 20 minutes 4°C - Filter the supernatant with 0.45 uM filter to remove all bacterial - Purify the SaCas9 from the filtered supernatant by using a commercial His column (by following the manufacturer’s manual)
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- 2019
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45. The role of potassium and host calcium signaling in Toxoplasma gondii egress
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Miryam Andrea Hortua Triana, Stephen A. Vella, Silvia N. J. Moreno, Zhu-Hong Li, Christina A. Moore, and Evgeniy Potapenko
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0301 basic medicine ,Physiology ,Intracellular Space ,Motility ,Models, Biological ,Article ,03 medical and health sciences ,Cytosol ,0302 clinical medicine ,parasitic diseases ,Extracellular ,Animals ,Humans ,Parasites ,Calcium Signaling ,Molecular Biology ,Calcium signaling ,biology ,Chemistry ,Intracellular parasite ,Cell Membrane ,Toxoplasma gondii ,Cell Biology ,biology.organism_classification ,Cell biology ,030104 developmental biology ,Cytoplasm ,Host-Pathogen Interactions ,Potassium ,Calcium ,Toxoplasma ,030217 neurology & neurosurgery ,Intracellular ,HeLa Cells - Abstract
Toxoplasma gondii is an obligate intracellular parasite and replicates inside a parasitophorous vacuole (PV) within the host cell. The membrane of the PV (PVM) contains pores that permits for equilibration of ions and small molecules between the host cytosol and the PV lumen. Ca(2+) signaling is universal and both T. gondii and its mammalian host cell utilize Ca(2+) signals to stimulate diverse cellular functions. Egress of T. gondii from host cells is an essential step for the infection cycle of T. gondii and a cytosolic Ca(2+) increase initiates a Ca(2+) signaling cascade that culminates in the stimulation of motility and egress. In this work, we demonstrate that intracellular T. gondii tachyzoites are able to take up Ca(2+) from the host cytoplasm during host signaling events. Both intracellular and extracellular Ca(2+) sources are important in reaching a threshold of cytosolic Ca(2+) needed for successful egress. Two peaks of Ca(2+) were observed in single parasites that egressed with the second peak resulting from Ca(2+) entry. We patched infected host cells to allow the delivery of precise concentrations of Ca(2+) for stimulation of motility and egress. Using this approach of patching infected host cells allowed to determine that increasing the host cytosolic Ca(2+) to a specific concentration can trigger egress, which is further accelerated by diminishing the concentration of potassium (K(+)).
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- 2021
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46. Selectivity in metal uptake by stationary phase microbial populations
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Premuzic, Eugene T., Lin, Mow, Zhu, Hong Li, and Gremme, Annette M.
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- 1991
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47. Bioactive terpenoids from Croton laui.
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Li, Fei, Zhang, Dong-Bo, Li, Jing-Tao, He, Feng-Jie, Zhu, Hong-Li, Li, Nan, Xiao, Xin-Chun, Ren, Li, and Zheng, Wei
- Subjects
TERPENES ,LIPOPOLYSACCHARIDES ,DITERPENES ,CIRCULAR dichroism ,CELL lines - Abstract
Two new highly-oxygenated neo-clerodane diterpenoids, 3S-acetoxyl-mollotucin D dilactone ester (1) and 6S-crotoeurin C (2), and a new lupane-type triterpene, 16β-hydroxyl-3β-O-trans-coumaroyl-betulin (6), as well as three known analogues (3–5) were obtained from the leaves of Croton laui. The structures of the new compounds were determined by extensive spectroscopic methods, and their absolute configurations were determined by combination of single-crystal X-ray diffraction analysis, electronic circular dichroism (ECD) spectra, and literature data. Compounds 2 and 3 exhibited inhibitory activities of lipopolysaccharide (LPS)-induced nitric oxide (NO) production in RAW 264.7 macrophages with IC
50 values of 1.2 and 1.6 μM, respectively. Additionally, compound 6 exhibited activity against Col205 and HepG2 cell lines with IC50 values of 12.9 and 17.7 μM, respectively. [ABSTRACT FROM AUTHOR]- Published
- 2021
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48. Publisher Correction: Genetic tool development in marine protists: emerging model organisms for experimental cell biology
- Author
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Claudio H. Slamovits, Gertraud Burger, Patrick J. Keeling, Jian Guo, Fatma Gomaa, Jan Pyrih, Jun Minagawa, Christopher L. Dupont, Verónica Freire-Benéitez, Nastasia J. Freyria, Rachele Cesaroni, Elizabeth C. Cooney, Eleanna Kazana, Aaron P. Turkewitz, Peter R. Girguis, Konomi Fujimura-Kamada, Chris Bowler, Anastasios D. Tsaousis, Pamela A. Silver, Lawrence A. Klobutcher, Tamara Matute, Shinichiro Maruyama, Nicole King, Virginia P. Edgcomb, Roberto Docampo, Isaac Núñez, Deborah L. Robertson, Xiaoxue Wen, Zhu-Hong Li, Huan Zhang, Jorge Ibañez, Kathryn J. Coyne, Jonathan Z. Kaye, Christopher J. Howe, Andrew E. Allen, Ross F. Waller, Brittany N. Sprecher, R. Ellen R. Nisbet, Mark Moosburner, Alexandra Z. Worden, Thomas Mock, Angela Piersanti, Sebastian G. Gornik, Paulo A. Garcia, Amanda Hopes, Isabel C. Nimmo, Mariana Rius, Estienne C. Swart, Nicholas A.T. Irwin, Elisabeth Hehenberger, Valérie Vergé, Andrea Highfield, Sandra Pucciarelli, François-Yves Bouget, Yutaka Hanawa, Matus Valach, April Woods, Elin Einarsson, Anna M. G. Novák Vanclová, Lu Wang, Fernán Federici, Monika Abedin Sigg, Adrian C. Barbrook, Yoshihisa Hirakawa, G. Jason Smith, Adam C. Jones, Deepak Nanjappa, Vladimír Hampl, Binnypreet Kaur, Thomas E. Clemente, Jernej Turnšek, Jean Claude Lozano, Sara J. Bender, Ian Hu, Sebastián R. Najle, Imen Lassadi, Glen L. Wheeler, Cecilia Balestreri, Fulei Luan, Lev Tsypin, Heriberto Cerutti, Miguel Angel Chiurillo, Colin Brownlee, Rowena Stern, Julius Lukeš, Manuel Ares, Drahomíra Faktorová, Kodai Fukuda, David S. Booth, Peter von Dassow, Elena Casacuberta, Patrick Beardslee, Cristina Miceli, Cristina Aresté, Natalia Ewa Janowicz, Joshua S. Rest, Susana A. Breglia, Senjie Lin, Luke M. Noble, Albane Ruaud, Duncan B. Coles, Pia A. Elustondo, Jackie L. Collier, Lisa Sudek, Yuu Ishii, José A. Fernández Robledo, Noelia Lander, Tobias von der Haar, Ambar Kachale, Esteban R. Haro-Contreras, Arnab Pain, Iñaki Ruiz-Trillo, and Mariusz Nowacki
- Subjects
biology ,Molecular biology ,media_common.quotation_subject ,Garcia ,Green Fluorescent Proteins ,Drahomira ,Eukaryota ,Marine Biology ,Cell Biology ,Art ,Biodiversity ,DNA ,Environment ,biology.organism_classification ,Genetic models ,Biochemistry ,Publisher Correction ,Models, Biological ,Transformation, Genetic ,Species Specificity ,Humanities ,Ecosystem ,Biotechnology ,media_common - Abstract
Author(s): Faktorova, Drahomira; Nisbet, R Ellen R; Fernandez Robledo, Jose A; Casacuberta, Elena; Sudek, Lisa; Allen, Andrew E; Ares, Manuel; Areste, Cristina; Balestreri, Cecilia; Barbrook, Adrian C; Beardslee, Patrick; Bender, Sara; Booth, David S; Bouget, Francois-Yves; Bowler, Chris; Breglia, Susana A; Brownlee, Colin; Burger, Gertraud; Cerutti, Heriberto; Cesaroni, Rachele; Chiurillo, Miguel A; Clemente, Thomas; Coles, Duncan B; Collier, Jackie L; Cooney, Elizabeth C; Coyne, Kathryn; Docampo, Roberto; Dupont, Christopher L; Edgcomb, Virginia; Einarsson, Elin; Elustondo, Pia A; Federici, Fernan; Freire-Beneitez, Veronica; Freyria, Nastasia J; Fukuda, Kodai; Garcia, Paulo A; Girguis, Peter R; Gomaa, Fatma; Gornik, Sebastian G; Guo, Jian; Hampl, Vladimir; Hanawa, Yutaka; Haro-Contreras, Esteban R; Hehenberger, Elisabeth; Highfield, Andrea; Hirakawa, Yoshihisa; Hopes, Amanda; Howe, Christopher J; Hu, Ian; Ibanez, Jorge; Irwin, Nicholas AT; Ishii, Yuu; Janowicz, Natalia Ewa; Jones, Adam C; Kachale, Ambar; Fujimura-Kamada, Konomi; Kaur, Binnypreet; Kaye, Jonathan Z; Kazana, Eleanna; Keeling, Patrick J; King, Nicole; Klobutcher, Lawrence A; Lander, Noelia; Lassadi, Imen; Li, Zhuhong; Lin, Senjie; Lozano, Jean-Claude; Luan, Fulei; Maruyama, Shinichiro; Matute, Tamara; Miceli, Cristina; Minagawa, Jun; Moosburner, Mark; Najle, Sebastian R; Nanjappa, Deepak; Nimmo, Isabel C; Noble, Luke; Novak Vanclova, Anna MG; Nowacki, Mariusz; Nunez, Isaac; Pain, Arnab; Piersanti, Angela; Pucciarelli, Sandra; Pyrih, Jan; Rest, Joshua S | Abstract: An amendment to this paper has been published and can be accessed via a link at the top of the paper.
- Published
- 2020
49. Using FACS to sort fluorescent Bodo cells v1
- Author
-
Zhu-Hong Li
- Subjects
Chemistry ,sort ,Fluorescence ,Cell biology - Abstract
Using FACS to sort fluorescent Bodo cells Introduction: Fluorescence-activated cell sorting (FACS) is a powerful method to isolate cells expressing fluorescent proteins. It is a routine technique in our lab to enrich, and subclone cells that express exogenously introduced fluorescent reporter proteins. We developed this protocol to isolate Bodo saltans that express a fluorescent protein. Unlike our previous work to isolate T. gondii, or T cruzi, there are two major obstacles to the application of this technology to B. saltans. The first obstacle is that B. saltans needs bacteria as food in the culture so there are multiple organisms in the medium. We have to determine which cells are B. saltans, and which are feeder bacteria. The second problem is that the osmolarity of the solution used for standard FACS is not appropriate for B. saltans. B. saltans lives in low osmolarity solutions. We needed to determine a proper solution in which B. saltans can survive, and if it works with the FACS system. Step 1. Determine a FACS solution appropriate for B. saltans. The solution that runs in a flow cytometer is called sheath fluid. Our FACS facility has its standard sheath fluid. In order to choose a proper sheath fluid for B. saltans we needed to make sure that: 1) the cells can survive in this sheath fluid for a significant time, 2) the sheath fluid can still support FACS since there is a requirement for the presence of ions for FACS to work. We tested serial dilutions of the standard sheath fluid. We found that B. saltans dies almost instantly in standard sheath fluid, but can live for at least 20 minutes in 50% sheath fluid. We also determined that the minimal sheath fluid needed for FACS is 40% of the standard sheath fluid. So we decided to use this diluted sheath fluid. Step 2. Determine which is the population of B. saltans. Wild type cultures are passed through a 10 nm Nylon filter to remove big residues in the culture medium, and filtered cells are collected by centrifugation at 1,200 x g for 5 minutes. The cells are further washed three times by centrifugation at 1,200 x g for 5 minutes, and twice at 1,200 x g for 5 minutes. The washing step is to get rid of most bacteria in the culture medium. After the last wash, the cells are resuspended in culture medium. We sort the cells by size and shape. There are usually two major distinct populations. We sort each of the populations into a collection tube. After the sorting, the cells are checked by microscopy. We confirm that the population 1 is B. saltans, and that the cells can survive the FACS sorting when we use 40% of standard sheath fluid as our sorting solution. Fig 1: R1 is B. saltans population. We previously used MoFlo XDP Sorter From Beckman Coulter, now we are upgrading to Beckman Coulter MoFlo Astrios EQ version. In the SSC Vs FSC dot plot, R1 represents B. saltans cells. Step 3. Sorting of B. saltans transfected with a reporter gene. 1, 24 hours after electroporation, B. saltans (wild type and transfected) are filtered through a 10 nm Nylon membrane. The cells are collected by centrifugation at 1,000 x g for 5 minutes. 2, Cells are washed twice with autoclaved distilled water. 3, After the final wash, cells are resuspended in ~1-1.5 ml medium. We also prepare a collection tube with 2 ml fresh culture medium. 4, After the sorter has been set up, we first run the wild type control cells to set up the parameters for sorting. In the SSC Vc FSC dot plot, the B. saltans population is chosen. Then in the fluorescence plot, we use DsRed Vs GFP dot plot to set the gate. There are no cells in the gated area for wild type cells. 5, After the parameters are set, we run the transfected B. saltans. A small population of fluorescent cells should appear in the fluorescence plot. This is the population we want to sort into a collection tube. 6, After the sorting is done, cells are transferred to the collection tube and then to a T25 flask, adding 4 ml culture medium and a small colony of bacteria taken from a plate. 7, Cells are cultured for further analysis. Fig. 2. Representative sorting of B. saltans
- Published
- 2018
- Full Text
- View/download PDF
50. Bioactive terpenoids from Croton laui
- Author
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Li, Fei, primary, Zhang, Dong-Bo, additional, Li, Jing-Tao, additional, He, Feng-Jie, additional, Zhu, Hong-Li, additional, Li, Nan, additional, Xiao, Xin-Chun, additional, Ren, Li, additional, and Zheng, Wei, additional
- Published
- 2019
- Full Text
- View/download PDF
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