23 results on '"Bae, Jung-Soo"'
Search Results
2. Effects of palmitoyl-KVK-L-ascorbic acid on skin wrinkles and pigmentation
- Author
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Kim, Hyeong Mi, An, Hyo Sun, Bae, Jung-Soo, Kim, Jung Yun, Choi, Chi Ho, Kim, Ju Yeon, Lim, Joo Hyuck, Choi, Joon-hun, Song, Hyunnam, Moon, Sung Ho, Park, Young Jun, Chang, Shin-Jae, and Choi, Sun Young
- Published
- 2017
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3. Palmitoyl-KVK-L-ascorbic acid conjugate improves matrix abnormality associated with skin aging via epigenetic regulation
- Author
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Kim, Min-Kyoung, Shin, Mi Hee, Lim, Joo Hyuck, Bae, Jung Soo, Lee, Yu Ri, Shin, Hye Sun, Cho, Soo Ick, Chung, Jin Ho, and Lee, Dong Hun
- Published
- 2021
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4. Compact Solid-State Marx Modulator With Fast Switching for Nanosecond Pulse.
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Bae, Jung-Soo, Kim, Tae-Hyun, Son, Seong-Ho, Gwon, Chang-Hyun, Kim, Hyoung-Suk, Yu, Chan-Hun, and Jang, Sung-Roc
- Subjects
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POWER semiconductors , *MODULAR construction , *HIGH voltages , *SILICON carbide , *PULSED power systems , *SOLID-state fermentation - Abstract
This article describes the compact solid-state Marx modulator (SSMM) with a fast rising time and a short pulsewidth based on the modular structure. By stacking of the TO-263-7 packaged silicon carbide mosfets having high voltage and fast switching capabilities, the designed circuit consists of three components, including the Marx capacitor, an on switch for applying pulse to the load, and an off switch to pull down the pulse. The off switch connected in parallel with load is chosen as a mosfet instead of a diode that is used in the conventional Marx generator. Because the off switch provides a discharging path for the stored energy on the parasitic capacitance, it is highly related to the fast falling time. In order to provide complementary driving signal and power for on/off switches, the simple control algorithm with a minimum component count and a reliable drive circuit against the noise are proposed. In addition, the synchronization of all the gate signals and a compact configuration for minimizing the stray inductance are essential to shorten the rising, falling, and pulsewidth. Based on the proposed circuit, the following specifications of the developed SSMM are achieved: the output voltage of 10 kV, the pulsewidth of less than 50 ns, and the rising and falling times of less than 15 ns. [ABSTRACT FROM AUTHOR]
- Published
- 2022
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5. Red ginseng and 20(S)-Rg3 control testosterone-induced prostate hyperplasia by deregulating androgen receptor signaling
- Author
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Bae, Jung-Soo, Park, Hyoung-Sook, Park, Jong-Wan, Li, Shan-Hua, and Chun, Yang-Sook
- Published
- 2012
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6. Series Stacked Modular DC–DC Converter Using Simple Voltage Balancing Method.
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Bae, Jung-Soo, Kim, Tae-Hyun, Son, Seong-Ho, Kim, Hyoung-Suk, Yu, Chan-Hun, and Jang, Sung-Roc
- Subjects
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DETECTOR circuits , *HIGH voltages , *VOLTAGE references , *VOLTAGE-frequency converters , *ELECTRIC current rectifiers , *POWER transformers , *AC DC transformers , *ELECTRIC potential - Abstract
This letter proposes a high output voltage dc–dc converter topology with series stacked converter modules. To implement the proposed modular dc–dc converter structure, output voltage balancing of the modules and simplification of the control circuitry were considered the major design objectives. To achieve voltage balancing between the modules, we proposed a split-secondary transformer winding structure and distributed connections to the rectifier circuit blocks. Each transformer includes two secondary windings, with each wire pair connected to a different rectifier circuit. Consequently, one rectifier receives ac power simultaneously by sharing the secondary windings fed from two different transformers. The proposed method was verified using a modular LCC resonant converter, which is widely employed in high-voltage applications. As a result, the control circuit was simplified by using a single controller to regulate the total output voltage and by applying a compact sensing circuit referenced to the output voltage of the module placed at the lowest grounding point. [ABSTRACT FROM AUTHOR]
- Published
- 2021
- Full Text
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7. Design and Testing of Bipolar Pulsed-Power Supply With High Efficiency and Power Density for Strategic Mineral Exploration.
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Bae, Jung-Soo, Kim, Jong-Soo, Kim, Hyoung-Suk, Yu, Chan-Hun, Kim, Shin, and Jang, Sung-Roc
- Subjects
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POWER density , *PROSPECTING , *HIGH voltages , *TEST design , *LOW voltage systems , *ELECTRIC inductance , *POWER resources - Abstract
In this paper, a 25-kW bipolar pulsed-power supply for strategic mineral exploration has been described. A 500-V, 12.5-A unit module consisting of a highly efficient LCC resonant converter and a full-bridge-based bipolar pulse-switching unit is designed. The LCC resonant converter has a trapezoidal-shaped resonant current for reduced conduction loss. For achieving high power density, the leakage inductance of the transformer is used as resonant inductance without an external inductor. Moreover, the designed gate drive circuit based on the repetitive short pulse is proposed to operate the frequency range from dc to 8 kHz and reduce the size of the gate transformer. Four modules are connected in series and parallel in order to operate the power supply in either loop mode or grounded dipole mode. Depending on the load condition, the pulse power source capable of delivering the required high voltage and low current (2 kV, 12.5 A) or low voltage and high current (500 V, 50 A) is operated either in grounded dipole mode or loop mode, respectively. In order to satisfy the output voltage balancing of the four modules, the third wire is wound to compensate for the transformer of the LCC resonant converter. Finally, the design of the bipolar pulsed-power supply has been verified based on the experimental results of the field test. [ABSTRACT FROM AUTHOR]
- Published
- 2019
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8. Design of Trigger Circuit for High-Power Gas Switch Based on Flyback Circuit.
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Kim, Shin, Bae, Jung-Soo, Kim, Hyoung-Suk, Yu, Chan-Hun, Lee, Byung-Joon, Ahn, Suk-Ho, and Jang, Sung-Roc
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ENERGY storage , *THYRISTORS , *GASES , *SWITCHING circuits , *LOGIC circuits , *POWER resources , *ELECTRIC transformers , *PULSE generators - Abstract
This paper proposes a flyback-circuit-based design of a trigger circuit for a high-power gas switch. By incorporating a flyback circuit in a high-power gas switch, it is possible to generate a high step-up ratio and high-voltage pulse by using a transformer. Furthermore, simple trigger circuit having the minimum possible number of components (transformer and switch) can be realized. When an inductor is used as an energy storage element, energy is stored as a current source, and thus, the element can operate reliably when low impedance exists between the trigger node of the switch after triggering. According to the fundamental operating principle of a flyback circuit, the proposed trigger circuit is designed considering the maximum trigger voltage and energy required for a high-power gas switch. To verify the proposed design procedure and feasibility of the trigger circuit, a compact trigger circuit (7.5 kV, 1.3 mJ/pulse) is simulated using the PSpice program and implemented. Based on this compact circuit, a trigger circuit (20 kV, 100 mJ/pulse) for a triggered vacuum switch (TVS) is developed, and the tests with an actual TVS (3.3 kJ) are carried out. [ABSTRACT FROM AUTHOR]
- Published
- 2019
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9. Modular Design of a Bipolar-Pulse-Power-Supply-Based LCC Resonant Converter for Strategic Mineral Exploration.
- Author
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Bae, Jung-Soo, Kim, Jong-Soo, Kim, Hyoung-Suk, Yu, Chan-Hun, and Jang, Sung-Roc
- Subjects
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BIPOLAR integrated circuits , *PROSPECTING , *ELECTRIC potential , *MODULES (Algebra) , *CONVERTERS (Electronics) - Abstract
This paper describes a bipolar pulsed power supply for strategic mineral exploration. Depending on the operating conditions, the bipolar pulsed power supply is capable of delivering the required high voltage and low current or low voltage and high current when operated, respectively, in either the grounded dipole mode or the loop mode. Based on a 500-V 12.5-A unit module, series and parallel connections of four modules are configured to satisfy both the grounded dipole mode (2000 V) and the loop mode (50 A), respectively. A unit module comprising an LCC resonant converter and a full-bridge-based bipolar pulse-switching unit is designed. In order to achieve high power density, the leakage inductance of the transformer is used as a resonant inductor in place of an external inductor. Accordingly, the resonant tank parameters are designed to give the resonant current a trapezoidal shape to reduce conduction loss and provide high efficiency. In addition, a simple gate-driving algorithm that uses the repetitive short pulse to cover the frequency range from dc to 8 kHz is proposed to allow the compact design of a minimized gate transformer. In this paper, the detailed design of the resonant circuit and the transformer of a unit module is described, and the operation is verified through simulation and experimental results. Finally, the developed LCC resonant converter achieves the maximum efficiency of 95%, the maximum power factor of 0.96, and a high power density of 806.5 W/L. [ABSTRACT FROM AUTHOR]
- Published
- 2019
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10. Design of Ion Pump Power Supply Based on LCC Resonant Converter.
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Bae, Jung-Soo, Jang, Sung-Roc, Kim, Hyeong-Suk, Yu, Chan-Hun, and Ahn, Suk-Ho
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ION pumps , *POWER resources , *ELECTRIC transformers , *HIGH voltages , *ELECTRIC leakage - Abstract
In this paper, the detailed design of an ion pump power supply is presented. The ion pump power supply was designed based on an LCC resonant topology with high switching frequency to take advantage of a smaller transformer for isolation. Because the proposed ion pump power supply has a 7-kV, 50-mA specification, high-voltage insulation is required. In order to secure insulation reliability, the power supply was designed with eight separate transformers that share primary turns. The spacing between the primary turns and secondary turns allows for increases in the leakage inductance and parasitic capacitance of the transformer. A compact design can be achieved using the parasitic component generated by the proposed design as the resonant parameters of the LCC resonant converter. In addition, based on a trapezoidal approximation of the LCC resonant converter, the resonant parameters are designed to have trapezoidal shapes of the resonant current in order to reduce conduction loss. Finally, the results of the experiment indicate that the developed ion pump power supply can be used effectively in high-voltage and low-current applications. [ABSTRACT FROM AUTHOR]
- Published
- 2018
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11. Black rice (Oryza sativa L.) extract modulates ultraviolet-induced expression of matrix metalloproteinases and procollagen in a skin cell model.
- Author
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Han, Mira, Bae, Jung-Soo, Ban, Jae-Jun, Shin, Hee Soon, Lee, Dong Hun, and Chung, Jin Ho
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- 2018
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12. Development of a 1.5 kV, 1.2 kA Pulsed-Power Supply for Light Sintering.
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Cho, Chan-Gi, Song, Seung-Ho, Park, Su-Mi, Park, Hyeon-Il, Bae, Jung-Soo, Jang, Sung-Roc, and Ryoo, Hong-Je
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CONVERTERS (Electronics) ,PULSED power systems ,XENON lamps ,SINTERING ,FLASH lamps ,TRANSISTORS ,ELECTRIC inverters - Abstract
This paper presents the design and experimental results of the 36-kW pulsed-power supply for the xenon flash lamp. The continuous conduction mode series-parallel resonant converter is modified. This means that not only the few hundred kilohertz of high switching frequency is introduced to replace the resonant inductor with the leakage inductor of transformer but also the high output current is accomplished by using three-phase delta-connected transformers. In addition, the snubber capacitor of the inverter switches and the power factor correction module is both omitted in the compact structure. Although these main components have changed, the efficiency and power factor of the rated dummy load reach 96% and 0.96%, respectively. Within 36-kW average power, the proposed pulsed-power supply can generate as versatile combination of output pulse. For example, it can generate 20-ms pulse with 1-Hz repetition rate or generate 1-ms pulse with 20-Hz repetition rate. The used insulated gate bipolar transistor is protected from the turn-OFF peak voltage by the snubber circuit, and the effect of the snubber circuit is shown at the actual load condition. [ABSTRACT FROM PUBLISHER]
- Published
- 2017
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13. Perilla frutescens leaves extract ameliorates ultraviolet radiation-induced extracellular matrix damage in human dermal fibroblasts and hairless mice skin.
- Author
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Bae, Jung-Soo, Han, Mira, Shin, Hee Soon, Kim, Min-Kyoung, Shin, Chang-Yup, Lee, Dong Hun, and Chung, Jin Ho
- Subjects
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EPIDERMIS , *PROTEIN analysis , *MEDICINAL plants , *REACTIVE oxygen species , *ALTERNATIVE medicine , *ANIMAL experimentation , *BIOLOGICAL assay , *BIOLOGICAL models , *COLLAGEN , *DOSE-effect relationship in pharmacology , *FIBROBLASTS , *HISTOLOGICAL techniques , *LEAVES , *MICE , *PHOSPHORYLATION , *POLYMERASE chain reaction , *PROTEIN kinases , *SKIN , *STAINS & staining (Microscopy) , *ULTRAVIOLET radiation , *WESTERN immunoblotting , *PLANT extracts , *STATISTICAL significance , *REVERSE transcriptase polymerase chain reaction , *MATRIX metalloproteinases , *IN vitro studies , *IN vivo studies , *METABOLISM , *PHYSIOLOGY - Abstract
Ethnopharmacological relevance Perilla frutescens (L.) Britt. (Lamiaceae) is a traditional herb that is consumed in East Asian countries as a traditional medicine. This traditional herb has been documented for centuries to treat various diseases such as depression, allergies, inflammation and asthma. However, the effect of Perilla frutescens on skin has not been characterized well. Aim of the study The present study aimed to investigate the effect of Perilla frutescens leaves extract (PLE) on ultraviolet radiation-induced extracellular matrix damage in human dermal fibroblasts and hairless mice skin. Materials and methods Human dermal fibroblasts and Skh-1 hairless mice were irradiated with UV and treated with PLE. Protein and mRNA levels of various target molecules were analyzed by western blotting and quantitative RT-PCR, respectively. Histological changes of mouse skin were analyzed by H&E staining. To elucidate underlying mechanism of PLE, activator protein-1 (AP-1) DNA binding assay and the measurement of reactive oxygen species (ROS) were performed. Results PLE significantly inhibited basal and UV-induced MMP-1 and MMP-3 expression dose-dependently, and also decreased UV-induced phosphorylation of extracellular signal-regulated kinases and c-Jun N-terminal kinases. This inhibitory effects of PLE on MMP-1 and MMP-3 were mediated by reduction of ROS generation and AP-1 DNA binding activity induced by UV. Furthermore, PLE promoted type I procollagen production irrespective of UV irradiation. In the UV-irradiated animal model, PLE significantly reduced epidermal skin thickness and MMP-13 expression induced by UV. Conclusion Our results demonstrate that PLE has the protective effect against UV-induced dermal matrix damage. Therefore, we suggest that PLE can be a potential agent for prevention of skin aging. [ABSTRACT FROM AUTHOR]
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- 2017
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14. Palmitoyl-RGD promotes the expression of dermal-epidermal junction components in HaCaT cells.
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Lim, Joo Hyuck, Bae, Jung Soo, Lee, Seung Ki, and Lee, Dong Hun
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WRINKLES (Skin) , *CELL anatomy , *REVERSE transcriptase polymerase chain reaction , *WESTERN immunoblotting , *GENE expression , *PROTEIN expression - Abstract
With age, the dermal-epidermal junction (DEJ) becomes thinner and production of its protein components decreases; this may be associated with increased fragility and wrinkling of skin. Topical treatment with palmitoyl-Arg-Gly-Asp (PAL-RGD) improves facial wrinkles, skin elasticity and dermal density in humans. In the present study, the effect of PAL-RGD on expression of DEJ components, such as laminin and collagen, was assessed. Human HaCaT keratinocytes were treated with PAL-RGD. The protein expression levels of laminin-332, collagen IV and collagen XVII were examined by western blotting. Reverse transcription-quantitative PCR was used to analyze laminin subunit (LAM)A3, LAMB3, LAMC2, collagen type IV α 1 chain (COL4A1) and COL17A1 mRNA expression levels. Western blot analysis showed that the expression levels of proteins comprising the DEJ, including laminin α3, β3 and γ2 and collagen IV and XVII demonstrated a significant dose-dependent increase following PAL-RGD treatment. Furthermore, PAL-RGD treatment significantly enhanced LAMA3, LAMB3, LAMC2, COL4A1 and COL17A1 mRNA expression levels. PAL-RGD may enhance the DEJ by inducing the expression of laminin-332, collagen IV and collagen XVII. [ABSTRACT FROM AUTHOR]
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- 2022
- Full Text
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15. Chaetocin inhibits IBMX-induced melanogenesis in B16F10 mouse melanoma cells through activation of ERK.
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Bae, Jung-Soo, Han, Mira, Yao, Cheng, and Chung, Jin Ho
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METHYLXANTHINES , *PIPERAZINE , *MELANOMA treatment , *EXTRACELLULAR signal-regulated kinases , *MELANOGENESIS , *ANTINEOPLASTIC agents , *ANTIBACTERIAL agents - Abstract
Chaetocin is a natural product isolated from Chaetomium species that has anti-bacterial and anti-myeloma activities. In this study, we investigated the inhibitory effect of chaetocin on melanogenesis and the underlying mechanisms in B16F10 mouse melanoma cells. In the present study, chaetocin significantly inhibited IBMX-induced melanin production and tyrosinase activity without any cytotoxicity. Furthermore, chaetocin down-regulated both the protein and mRNA levels of tyrosinase, which is a specific enzyme that catalyzes the conversion of tyrosine to melanin. We also observed that the protein level of MITF was significantly reduced by chaetocin treatment. In addition, we found that the anti-melanogenic effect of chaetocin was suppressed by treatment with the specific ERK inhibitor (PD98059). Accordingly, chaetocin inhibited melanogenesis via suppressing the protein level of MITF followed by activation of the ERK signaling pathway. These data suggest that chaetocin may be a potential anti-melanogenic agent for use in skin-whitening cosmetics and a topical agent for treatment of hyperpigmentation disorders. [ABSTRACT FROM AUTHOR]
- Published
- 2016
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16. UV irradiation through skin or eye reduces hippocampal neurogenesis and synaptic protein expression.
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Han, Mira, Bae, Jung‐Soo, Shin, Chang‐Yup, Ban, Jae‐Jun, Quan, Qing‐Ling, Lee, Dong Hun, and Chung, Jin Ho
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ULTRAVIOLET radiation , *DEVELOPMENTAL neurobiology , *PROTEIN expression - Published
- 2018
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17. A layered polymorph of rare earth hydroxides.
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Lee, Byung-II, Jeong, Heejin, Bae, Jung-soo, and Byeon, Song-Ho
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RARE earth metals ,HYDROXIDES ,PHASE transitions ,POLYMORPHISM (Crystallography) ,RARE earth ions ,MAGNETIC resonance imaging ,DISULFIDES - Abstract
A layered polymorph series of rare earth hydroxides has been developed by the conversion of RE
2 (OH)5 Cl·mH2 O to RE(OH)3 ·nH2 O (RE = rare earths) with a typical layered structure with interlayer water molecules. A temperature-induced phase transition from the layered polymorph to its hexagonal form is completed at approximately 300 °C. [ABSTRACT FROM AUTHOR]- Published
- 2013
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18. ChemInform Abstract: A Layered Polymorph of Rare Earth Hydroxides.
- Author
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Lee, Byung‐II, Jeong, Heejin, Bae, Jung‐Soo, and Byeon, Song‐Ho
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- 2013
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19. Comparison of the Gut Microbiota of Centenarians in Longevity Villages of South Korea with Those of Other Age Groups.
- Author
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Kim BS, Choi CW, Shin H, Jin SP, Bae JS, Han M, Seo EY, Chun J, and Chung JH
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- Adult, Aged, Aged, 80 and over, Bacteria genetics, Diet, Environment, Feces microbiology, Female, Glycosphingolipids biosynthesis, Hospitals, Rehabilitation, Humans, Male, Meals, Metabolic Networks and Pathways, Middle Aged, Phosphatidylinositols biosynthesis, Phylogeny, Polysaccharides biosynthesis, Polysaccharides pharmacology, Republic of Korea, Sequence Analysis, DNA, Bacteria classification, Bacteria metabolism, Gastrointestinal Microbiome physiology, Longevity
- Abstract
Several studies have attempted to identify factors associated with longevity and maintenance of health in centenarians. In this study, we analyzed and compared the gut microbiota of centenarians in longevity villages with the elderly and adults in the same region and urbanized towns. Fecal samples were collected from centenarians, elderly, and young adults in longevity villages, and the gut microbiota sequences of elderly and young adults in urbanized towns of Korea were obtained from public databases. The relative abundance of Firmicutes was found to be considerably higher in subjects from longevity villages than those from urbanized towns, whereas Bacteroidetes was lower. Age-related rearrangement of gut microbiota was observed in centenarians, such as reduced proportions of Faecalibacterium and Prevotella , and increased proportion of Escherichia , along with higher abundances of Akkermansia , Clostridium , Collinsella , and uncultured Christensenellaceae . Gut microbiota of centenarians in rehabilitation hospital were also different to those residing at home. These differences could be due to differences in diet patterns and living environments. In addition, phosphatidylinositol signaling system, glycosphingolipid biosynthesis, and various types of N-glycan biosynthesis were predicted to be higher in the gut microbiota of centenarians (corrected p < 0.05). These three metabolic pathways of gut microbiota can be associated with the immune status and healthy gut environment of centenarians. Although further studies are necessary to validate the function of microbiota between groups, this study provides valuable information on centenarians' gut microbiota.
- Published
- 2019
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20. UV irradiation to mouse skin decreases hippocampal neurogenesis and synaptic protein expression via HPA axis activation.
- Author
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Han M, Ban JJ, Bae JS, Shin CY, Lee DH, and Chung JH
- Subjects
- Animals, Brain-Derived Neurotrophic Factor blood, Corticosterone blood, Depressive Disorder blood, Depressive Disorder physiopathology, Gene Expression Regulation radiation effects, Hypothalamo-Hypophyseal System metabolism, MAP Kinase Signaling System radiation effects, Male, Mice, Neuronal Plasticity radiation effects, Pituitary-Adrenal System metabolism, Skin metabolism, Skin radiation effects, Stress, Psychological metabolism, Stress, Psychological physiopathology, Synapses metabolism, Synapses radiation effects, Temporal Lobe physiopathology, Ultraviolet Rays, Depressive Disorder genetics, Disks Large Homolog 4 Protein genetics, Neurogenesis genetics, Receptors, N-Methyl-D-Aspartate genetics
- Abstract
The skin senses external environment, including ultraviolet light (UV). Hippocampus is a brain region that is responsible for memory and emotion. However, changes in hippocampus by UV irradiation to the skin have not been studied. In this study, after 2 weeks of UV irradiation to the mouse skin, we examined molecular changes related to cognitive functions in the hippocampus and activation of the hypothalamic-pituitary-adrenal (HPA) axis. UV exposure to the skin decreased doublecortin-positive immature neurons and synaptic proteins, including N-methyl-D-aspartate receptor 2 A and postsynaptic density protein-95, in the hippocampus. Moreover, we observed that UV irradiation to the skin down-regulated brain-derived neurotrophic factor expression and ERK signaling in the hippocampus, which are known to modulate neurogenesis and synaptic plasticity. The cutaneous and central HPA axes were activated by UV, which resulted in significant increases in serum levels of corticosterone. Subsequently, UV irradiation to the skin activated the glucocorticoid-signaling pathway in the hippocampal dentate gyrus. Interestingly, after 6 weeks of UV irradiation, mice showed depression-like behavior in the tail suspension test. Taken together, our data suggest that repeated UV exposure through the skin may negatively affect hippocampal neurogenesis and synaptic plasticity along with HPA axis activation.
- Published
- 2017
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21. Lycopersicon esculentum Extract Enhances Cognitive Function and Hippocampal Neurogenesis in Aged Mice.
- Author
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Bae JS, Han M, Shin HS, Shon DH, Lee ST, Shin CY, Lee Y, Lee DH, and Chung JH
- Subjects
- Animals, Behavior, Animal, Biomarkers metabolism, Brain-Derived Neurotrophic Factor agonists, Brain-Derived Neurotrophic Factor genetics, Brain-Derived Neurotrophic Factor metabolism, Cognition, Doublecortin Protein, Exploratory Behavior, Female, Fruit chemistry, Hippocampus cytology, Hippocampus metabolism, Hippocampus pathology, MAP Kinase Signaling System, Mice, Hairless, Neurodegenerative Diseases metabolism, Neurodegenerative Diseases pathology, Neurons cytology, Neurons metabolism, Neurons pathology, Random Allocation, Recognition, Psychology, Up-Regulation, Aging, Dietary Supplements, Solanum lycopersicum chemistry, Neurodegenerative Diseases prevention & control, Neurogenesis, Nootropic Agents therapeutic use, Plant Extracts therapeutic use
- Abstract
A decrease in adult neurogenesis is associated with the aging process, and this decrease is closely related to memory impairment. Tomato ( Lycopersicon esculentum ) is a fruit with diverse bioactive nutrients that is consumed worldwide. In this study, we investigated the cognition-enhancing effect of tomato ethanolic extracts (TEE) in aged mice. Six weeks of oral TEE administration in 12-month-old aged mice significantly increased their exploration time of novel objects when compared to vehicle-treated mice. The TEE supplement increased doublecortin (DCX)-positive cells and postsynaptic density-95 (PSD95) expression in mice hippocampus. Moreover, we found an increased expression of brain-derived neurotrophic factor (BDNF) and subsequently-activated extracellular-signal-regulated kinase (ERK)/cAMP response element binding (CREB) signaling pathway in the TEE-supplemented mice hippocampus. In conclusion, the oral administration of TEE exhibits a cognition-enhancing effect, and the putative underlying mechanism is the induction of BDNF signaling-mediated proliferation and synapse formation in the hippocampus. These findings indicate that TEE could be a candidate for treatment of age-related memory impairment and neurodegenerative disorders., Competing Interests: The authors declare no conflict of interest.
- Published
- 2016
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22. Oral Supplementation with Cocoa Extract Reduces UVB-Induced Wrinkles in Hairless Mouse Skin.
- Author
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Kim JE, Song D, Kim J, Choi J, Kim JR, Yoon HS, Bae JS, Han M, Lee S, Hong JS, Song D, Kim SJ, Son MJ, Choi SW, Chung JH, Kim TA, and Lee KW
- Subjects
- Administration, Oral, Analysis of Variance, Animals, Collagen metabolism, Disease Models, Animal, Female, Gene Expression Regulation, Humans, Matrix Metalloproteinase 1 genetics, Mice, Mice, Hairless, Plant Extracts pharmacology, Random Allocation, Sensitivity and Specificity, Transcription Factor AP-1 genetics, Up-Regulation, Cacao, Collagen drug effects, Dietary Supplements, Skin Aging genetics, Ultraviolet Rays adverse effects
- Abstract
Cacao beans contain various bioactive phytochemicals that could modify the pathogeneses of certain diseases. Here, we report that oral administration of cacao powder (CP) attenuates UVB-induced skin wrinkling by the regulation of genes involved in dermal matrix production and maintenance. Transcriptome analysis revealed that 788 genes are down- or upregulated in the CP supplemented group, compared with the UVB-irradiated mouse skin controls. Among the differentially expressed genes, cathepsin G and serpin B6c play important roles in UVB-induced skin wrinkle formation. Gene regulatory network analysis also identified several candidate regulators responsible for the protective effects of CP supplementation against UVB-induced skin damage. CP also elicited antiwrinkle effects via inhibition of UVB-induced matrix metalloproteinases-1 expression in both the human skin equivalent model and human dermal fibroblasts. Inhibition of UVB-induced activator protein-1 via CP supplementation is likely to affect the expression of matrix metalloproteinases-1. CP supplementation also downregulates the expression of cathepsin G in human dermal fibroblasts. 5-(3',4'-Dihydroxyphenyl)-γ-valerolactone, a major in vivo metabolite of CP, showed effects similar to CP supplementation. These results suggest that cacao extract may offer a protective effect against photoaging by inhibiting the breakdown of dermal matrix, which leads to an overall reduction in wrinkle formation., (Copyright © 2016 The Authors. Published by Elsevier Inc. All rights reserved.)
- Published
- 2016
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23. Toll-like receptor family members in skin fibroblasts are functional and have a higher expression compared to skin keratinocytes.
- Author
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Yao C, Oh JH, Lee DH, Bae JS, Jin CL, Park CH, and Chung JH
- Subjects
- Extracellular Signal-Regulated MAP Kinases metabolism, Humans, Interleukin-6 genetics, Interleukin-6 metabolism, Interleukin-8 genetics, Interleukin-8 metabolism, Ligands, Matrix Metalloproteinase 1 genetics, Matrix Metalloproteinase 1 metabolism, Phosphorylation, Fibroblasts metabolism, Gene Expression, Keratinocytes metabolism, Skin metabolism, Toll-Like Receptors genetics, Toll-Like Receptors metabolism
- Abstract
Toll-like receptors (TLRs) are known to recognize not only pathogen-associated molecular patterns but also danger-associated molecular patterns. Recent studies have characterized the expression levels and functions of TLRs in human epidermal cells. However, the characteristics of TLR family members in human dermal fibroblasts have not been thoroughly studied. Therefore, the present study systematically investigated the expression levels of TLRs and their functional responses to each ligand in skin fibroblasts. All 10 TLRs are expressed in skin fibroblasts. Stimulation of skin fibroblasts with each TLR ligand resulted in an increase of the interleukin-6 (IL-6), IL-8 and matrix metalloproteinase-1 proteins, indicating that ≥ 9 TLRs in skin fibroblasts are functionally active. Furthermore, stimulating skin fibroblasts with TLR1/2, 3 and 4 ligands induced the phosphorylation of inhibitor of nuclear factor κBα and the active phosphorylation of extracellular-signal regulated kinase 1/2. The expression level of each TLR was much higher in fibroblasts compared to keratinocytes. In particular, the fold-increase in IL-6 and IL-8 mRNA levels upon exposure to a TLR1/2 ligand was much higher in fibroblasts compared to keratinocytes, which appears to reflect the difference in expression levels of TLR1 and 2 between fibroblasts and keratinocytes. Taken together, these results show that all 10 TLRs are constitutively expressed and functional (except TLR10) in skin fibroblasts and suggest that TLRs in skin fibroblasts may play an important role in the detection of and response to different classes of pathogens and danger signals.
- Published
- 2015
- Full Text
- View/download PDF
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