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Search Results: 1 - 10 of 56162 matches for " Jae-Hong Kim "
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MCL-1ES Induces MCL-1L-Dependent BAX- and BAK-Independent Mitochondrial Apoptosis
Jae-Hong Kim, Jeehyeon Bae
PLOS ONE , 2013, DOI: 10.1371/journal.pone.0079626
Abstract: MCL-1 (myeloid cell leukemia-1), a member of the BCL-2 family, has three splicing variants, antiapoptotic MCL-1L, proapoptotic MCL-1S, and MCL-1ES. We previously reported cloning MCL-1ES and characterizing it as an apoptotic molecule. Here, we investigated the molecular mechanism by which MCL-1ES promotes cell death. MCL-1ES was distinct from other proapoptotic BCL-2 members that induce apoptosis by promoting BAX or BAK oligomerization, leading to mitochondrial outer membrane permeabilization (MOMP), in that MCL-1ES promoted mitochondrial apoptosis independently of both BAX and BAK. Instead, MCL-1L was crucial for the apoptotic activity of MCL-1ES by facilitating its proper localization to the mitochondria. MCL-1ES did not interact with any BCL-2 family proteins except for MCL-1L, and antiapoptotic BCL-2 members failed to inhibit apoptosis induced by MCL-1ES. The BCL-2 homology 3 (BH3) domain of MCL-1ES was critical for both MCL-1ES association with MCL-1L and apoptotic activity. MCL-1ES formed mitochondrial oligomers, and this process was followed by MOMP and cytochrome c release in a MCL-1L-dependent manner. These findings indicate that MCL-1ES, as a distinct proapoptotic BCL-2 family protein, may be useful for intervening in diseases that involve uncontrolled MCL-1L.
Biotransformation of endosulfan by the tiger worm, Eisenia fetida  [PDF]
Byeoung-Soo Park, Jae-Hong Yoo, Jeong-Han Kim, Sung-Eun Lee, Jang-Eok Kim
Journal of Agricultural Chemistry and Environment (JACEN) , 2012, DOI: 10.4236/jacen.2012.11004
Abstract: This study assesses the role of the earthworm, Eisenia fetida, in the breakdown of endosulfan in a soil environment. Two strains of E. fetida were used in this study to assess the effect of salinity on toxicity and metabolism of endosulfan in these earthworms. One strain of E. fetida (R) was reared in high salinity soil (over 2.0 dS/m of electric conductivity) from Shiwha lake, Korea. A control strain (W) was reared in pig manure compost. Acute toxicity of endosulfan was lower in the R strain when endosulfan was injected. In vitro metabolic studies of endosulfan based on microsomal preparations showed that both strains produced two major metabolites, endosulfan sulfate and endosulfan diol. The production rate of endodulfan sulfate was not significantly different between the strains, while endosulfan diol production was significantly different. In vivo metabolism studies showed only one primary metabolite, endosulfan sulfate, was produced by both strains. HPLC-MS/MS analysis showed annetocin was the indicative protein newly expressed in the R strain in relation to salinity exposure. These findings suggest salinity may induce hydrolyzing enzymes to produce endosulfan diol from endosulfan.
Human Body Tracking and Pose Estimation Using Modified Camshift Algorithm  [PDF]
Seung-Jun Hwang, Jae-Hong Min, In-Gyu Kim, Seung-Jae Park, Gwang-Pyo Ahn, Joong-Hwan Baek
Journal of Software Engineering and Applications (JSEA) , 2013, DOI: 10.4236/jsea.2013.65B008
Abstract: In this paper, we propose multiple CAMShift Algorithm based on Kalman filter and weighted search windows that extracts skin color area and tracks several human body parts for real-time human tracking system. The CAMShift Algorithm we propose searches the skin color region by detecting the skin color area from background model. Kalman filter stabilizes the floated search area of CAMShift Algorithm. Each occlusion areas are avoided by using weighted window of non-search areas and main-search area. And shadows are eliminated from background model and intensity of shadow. The proposed modified Camshaft algorithm can estimate human pose in real-time and achieves 96.82% accuracy even in the case of occlusions.
Fischer-Tropsch Synthesis of the Promoted Co/ZSM-5 Hybrid Catalysts for the Production of Gasoline Range Hydrocarbons  [PDF]
Suk-Hwan Kang, Jae-Hong Ryu, Jin-Ho Kim, Hyo-Sik Kim, Chan-Gi Lee, Yun-Jo Lee, Ki-Won Jun
Modern Research in Catalysis (MRC) , 2014, DOI: 10.4236/mrc.2014.33013
Abstract:

Fischer-Tropsch synthesis (FTS) reaction for the direct production of gasoline range hydrocarbons (C5-C9) from syngas was investigated on Ru, Pt, and La promoted Co/ZSM-5 (Si/Al = 25) catalysts. The hybrid catalysts were characterized by BET surface area, XRD, H2-TPR, NH3-TPD and XPS analyses. These physico-chemical properties were correlated with activity and selectivity of the catalysts. The promoted Co/ZSM-5 hybrid catalysts were found to be superior to the unpromoted Co/ZSM-5 catalyst in terms of better C5-C9 selectivity. Pt-Co/ZSM-5 exhibited the highest catalytic activity because of the small cobalt particle size.

 

BLT2 Up-Regulates Interleukin-8 Production and Promotes the Invasiveness of Breast Cancer Cells
Hyunju Kim,Jung-A Choi,Geun-Soo Park,Jae-Hong Kim
PLOS ONE , 2012, DOI: 10.1371/journal.pone.0049186
Abstract: The elevated production of interleukin (IL)–8 is critically associated with invasiveness and metastatic potential in breast cancer cells. However, the intracellular signaling pathway responsible for up-regulation of IL-8 production in breast cancer cells has remained unclear.
Prediction of Risk Factors for Coronary Heart Disease Using Framingham Risk Score in Korean Men
Jae-Hong Ryoo, Soo Hyun Cho, Sang-Wook Kim
PLOS ONE , 2012, DOI: 10.1371/journal.pone.0045030
Abstract: Background Currently, there is sparse data available on the relationship between coronary heart disease (CHD) and its risk factors estimated by the Framingham Risk Score (FRS) in Korea. This is particularly true when looking at risk factors of CHD associated with the FRS after adjustment for other covariates especially in healthy subjects. Methodology/Principal Findings We conducted a prospective cohort study to examine the association between the risk factors of CHD and the risk for CHD estimated by FRS in 15,239 men in 2005 and 2010. The FRS is based on six coronary risk factors: gender, age, total cholesterol, high-density lipoprotein (HDL)-cholesterol, systolic blood pressure (BP), and smoking habit. Multiple linear regression analysis was used to analyze the relationships between the FRS and risk factors for CHD. This study reported that apolipoproetein B (apoB), apoA-I, apoB/apoA-I, alcohol intake, log-transformed TG, log-transformed hsCRP, LDL-cholesterol, hypertension, diabetes, regular exercise, and BMI were significantly associated with the FRS. Above all, the partial R-square of apoB was 14.77%, which was overwhelmingly bigger than that of other variables in model V. This indicated that apoB accounted for 14.77% of the variance in FRS. Conclusion/Significance In this study, apoB was found to be the most important determinant for the future development of CHD during a 5-year follow-up in healthy Korean men.
Comparative Genomics of Korean Infectious Bronchitis Viruses (IBVs) and an Animal Model to Evaluate Pathogenicity of IBVs to the Reproductive Organs
Seung-Min Hong,Hyuk-Joon Kwon,Il-Hwan Kim,Mei-Lan Mo,Jae-Hong Kim
Viruses , 2012, DOI: 10.3390/v4112670
Abstract: The K-I and nephropathogenic K-II genotypes of infectious bronchitis virus (IBV) have been isolated since 1995 and 1990, respectively, in Korea and commercial inactivated oil-emulsion vaccines containing KM91 (K-II type) and Massachusetts 41 strains have been used in the field. To date, genomic analyses of Korean IBV strains and animal models to test the pathogenicity of Korean IBVs to the reproductive organs have been rare. In the present study, comparative genomics of SNU8067 (K-I type) and KM91 IBVs was performed, and an animal model to test the pathogenicity of SNU8067 was established and applied to vaccine efficacy test. The genome sizes of SNU8067 (27,708 nt) and KM91 (27,626 nt) were slightly different and the nucleotide and amino acid identities of the S1 (79%, 77%), 3a (65%, 52%), and 3b (81%, 72%) genes were lower than those of other genes (94%–97%, 92%–98%). A recombination analysis revealed that SNU8067 was a recombinant virus with a KM91-like backbone except S1, 3a, and 3b genes which might be from an unknown virus. An SNU8067 infection inhibited formation of hierarchal ovarian follicles (80%) and oviduct maturation (50%) in the control group, whereas 70% of vaccinated chickens were protected from lesions.
Plasminogen activator inhibitor type 1 regulates microglial motility and phagocytic activity
Hyejin Jeon, Jong-Heon Kim, Jae-Hong Kim, Won-Ha Lee, Myung-Shik Lee, Kyoungho Suk
Journal of Neuroinflammation , 2012, DOI: 10.1186/1742-2094-9-149
Abstract: In this study, we identified PAI-1 in the culture medium of mouse mixed glial cells by liquid chromatography and tandem mass spectrometry. Secretion of PAI-1 from glial cultures was detected by ELISA and western blotting analysis. Cell migration was evaluated by in vitro scratch-wound healing assay or Boyden chamber assay and an in vivo stab wound injury model. Phagocytic activity was measured by uptake of zymosan particles.The levels of PAI-1 mRNA and protein expression were increased by lipopolysaccharide and interferon-γ stimulation in both microglia and astrocytes. PAI-1 promoted the migration of microglial cells in culture via the low-density lipoprotein receptor-related protein (LRP) 1/Janus kinase (JAK)/signal transducer and activator of transcription (STAT)1 axis. PAI-1 also increased microglial migration in vivo when injected into mouse brain. PAI-1-mediated microglial migration was independent of protease inhibition, because an R346A mutant of PAI-1 with impaired PA inhibitory activity also promoted microglial migration. Moreover, PAI-1 was able to modulate microglial phagocytic activity. PAI-1 inhibited microglial engulfment of zymosan particles in a vitronectin- and Toll-like receptor 2/6-dependent manner.Our results indicate that glia-derived PAI-1 may regulate microglial migration and phagocytosis in an autocrine or paracrine manner. This may have important implications in the regulation of brain microglial activities in health and disease.
Genetic Diversity of Spike, 3a, 3b and E Genes of Infectious Bronchitis Viruses and Emergence of New Recombinants in Korea
Mei-Lan Mo,Seung-Min Hong,Hyuk-Joon Kwon,Il-Hwan Kim,Chang-Seon Song,Jae-Hong Kim
Viruses , 2013, DOI: 10.3390/v5020550
Abstract: The nucleotide sequences of a region including S1, S2, 3a, 3b and E genes of twenty-seven infectious bronchitis virus (IBV) isolates in Korea between 1990–2011 were determined and phylogenetic and computational recombination analyses were conducted. The sizes of coding regions of some genes varied among IBV isolates due to deletion or insertion of nucleotides; the nucleotide similarities of S1, S2, 3a, 3b and E genes among the 27 isolates were 75.9%–100.0%, 85%–100.0%, 64.0%–100.0%, 60.4%–100.0% and 83.1%–100.0%, respectively. According to phylogenetic analysis of S1 gene, the 27 isolates were divided into five genotypes, Mass, Korean-I (K-I), QX-like, KM91-like and New cluster 1. The phylogenetic trees based on the S2, 3a, 3b, E genes and S1-S2-3a-3b-E (S1-E) region nucleotide sequences did not closely follow the clustering based on the S1 sequence. The New cluster 1 prevalent during 2009 and 2010 was not found in 2011 but QX-like viruses became prevalent in 2011. The recombination analysis revealed two new S gene recombinants, 11036 and 11052 which might have been derived from recombinations between the New cluster 1 and QX-like viruses and between the K-I and H120 (vaccine) viruses, respectively. In conclusion, multiple IBV genotypes have co-circulated; QX-like viruses have recurred and new recombinants have emerged in Korea. This has enriched molecular epidemiology information of IBV and is useful for the control of IB in Korea.
Time-dependent effects of hypothermia on microglial activation and migration
Jung-Wan Seo, Jong-Heon Kim, Jae-Hong Kim, Minchul Seo, Hyung Soo Han, Jaechan Park, Kyoungho Suk
Journal of Neuroinflammation , 2012, DOI: 10.1186/1742-2094-9-164
Abstract: Microglial cells in culture were subjected to mild (33?°C) or moderate (29?°C) hypothermic conditions before, during, or after lipopolysaccharide (LPS) or hypoxic stimulation, and the production of nitric oxide (NO), proinflammatory cytokines, reactive oxygen species, and neurotoxicity was evaluated. Effects of hypothermia on microglial migration were also determined in in vitro as well as in vivo settings.Early-, co-, and delayed-hypothermic treatments inhibited microglial production of inflammatory mediators to varying degrees: early treatment was the most efficient, and delayed treatment showed time-dependent effects. Delayed hypothermia also suppressed the mRNA levels of proinflammatory cytokines and iNOS, and attenuated microglial neurotoxicity in microglia-neuron co-cultures. Furthermore, delayed hypothermia reduced microglial migration in the Boyden chamber assay and wound healing assay. In a stab injury model, delayed local hypothermia reduced migration of microglia toward the injury site in the rat brain.Taken together, our results indicate that delayed hypothermia is sufficient to attenuate microglial activation and migration, and provide the basis of determining the optimal time window for therapeutic hypothermia. Delayed hypothermia may be neuroprotective by inhibiting microglia-mediated neuroinflammation, indicating the therapeutic potential of post-injury hypothermia for patients with brain damages exhibiting some of the inflammatory components.
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