oalib

Publish in OALib Journal

ISSN: 2333-9721

APC: Only $99

Submit

Any time

2019 ( 5 )

2018 ( 14 )

2017 ( 23 )

2016 ( 21 )

Custom range...

Search Results: 1 - 10 of 4386 matches for " Bang Yeon Hwang "
All listed articles are free for downloading (OA Articles)
Page 1 /4386
Display every page Item
Neuroprotective Effects of Herbal Ethanol Extracts from Gynostemma pentaphyllum in the 6-Hydroxydopamine-Lesioned Rat Model of Parkinson's Disease
Hyun Sook Choi,Mi Sook Park,Seung Hwan Kim,Bang Yeon Hwang,Chong Kil Lee,Myung Koo Lee
Molecules , 2010, DOI: 10.3390/molecules15042814
Abstract: 6-Hydroxydopamine administration for 28 days (8 μg/2 μL) reduced the number of tyrosine hydroxylase (TH)-immunopositive neurons to 40.2% in the substantia nigra compared to the intact contralateral side. Dopamine, 3,4-dihydroxyphenylacetic acid, homovanillic acid and norepinephrine levels were reduced to 19.1%, 52.3%, 47.1% and 67.4% in the striatum of 6-hydroxydopamine-lesioned rats compared to the control group, respectively. However, an oral administration of herbal ethanol extracts from Gynostemma pentaphyllum (GP-EX) (10 mg/kg and 30 mg/kg) starting on day 3 post-lesion for 28 days markedly ameliorated the reduction of TH-immunopositive neurons induced by 6-hydroxydopamine-lesioned rat brain from 40.2% to 67.4% and 75.8% in the substantia nigra. GP-EX administration (10 and 30 mg/kg) also recovered the levels of dopamine, 3,4-dihydroxyphenylacetic acid, homovanillic acid and norepinephrine in post-lesion striatum to 64.1% and 65.0%, 77.9% and 89.7%, 82.6% and 90.2%, and 88.1% and 89.2% of the control group. GP-EX at the given doses did not produce any sign of toxicity such as weight loss, diarrhea and vomiting in rats during the 28 day treatment period and four gypenoside derivatives, gynosaponin TN-1, gynosaponin TN-2, gypenoside XLV and gypenoside LXXIV were identified from GP-EX. These results suggest that GP-EX might be helpful in the prevention of Parkinson’s disease.
Inhibitory Effect of Inflexinol on Nitric Oxide Generation and iNOS Expression via Inhibition of NF- Activation
Jae Woong Lee,Moon Soon Lee,Tae Hun Kim,Hwa Jeong Lee,Seong Su Hong,Young Hee Noh,Bang Yeon Hwang,Jai Seup Ro,Jin Tae Hong
Mediators of Inflammation , 2007, DOI: 10.1155/2007/93148
Abstract: Inflexinol, an ent-kaurane diterpenoid, was isolated from the leaves of Isodon excisus. Many diterpenoids isolated from the genus Isodon (Labiatae) have antitumor and antiinflammatory activities. We investigated the antiinflammatory effect of inflexinol in RAW 264.7 cells and astrocytes. As a result, we found that inflexinol (1, 5, 10 μM) suppressed the expression of inducible nitric oxide synthase (iNOS) and cyclooxygenase-2 (COX-2) as well as the production of nitric oxide (NO) in LPS-stimulated RAW 264.7 cells and astrocytes. Consistent with the inhibitory effect on iNOS and COX-2 expression, inflexinol also inhibited transcriptional and DNA binding activity of NF-κB via inhibition of IκB degradation as well as p50 and p65 translocation into nucleus. These results suggest that inflexinol inhibits iNOS and COX-2 expression through inhibition of NF-κB activation, thereby inhibits generation of inflammatory mediators in RAW 264.7 cells and astrocytes, and may be useful for treatment of inflammatory diseases.
Restoration of Electric Footshock-Induced Immunosuppression in Mice by Gynostemma pentaphyllum Components
Sun-A Im,Hyun Sook Choi,Soon Ok Choi,Ki-Hyang Kim,Seungjeong Lee,Bang Yeon Hwang,Myung Koo Lee,Chong Kil Lee
Molecules , 2012, DOI: 10.3390/molecules17077695
Abstract: The immunomodulatory effects of the ethanol extract of Gynostemma pentaphyllum (GP-EX) were examined in electric footshock (EFS)-stressed mice. The mice were orally administered various doses of GP-EX for 7 days before exposure to EFS (duration: 3 min, interval: 10 s, intensity: 2 mA) once a day from day 8 for 14 days with continuous daily feeding of GP-EX. Oral administration of GP-EX to mice prevented EFS stress-induced immunosuppression as determined by the lymphoid organ (thymus and spleen) weight and cellularity. In addition, oral administration of GP-EX restored EFS-suppressed functional properties of mature lymphocytes in terms of concanavalin A-induced proliferation of splenocytes and lipopolysaccharide-induced cytokine production (TNF-α, IL-1β). Furthermore, we found that mice that were orally administered with GP-EX generated much more potent ovalbumin-specific cytotoxic T lymphocyte responses upon intravenous ovalbumin injection compared to the untreated controls. These results demonstrate that oral administration of the ethanol extract of Gynostemma pentaphyllum could increase host defense in immunocompromised situations such as stress-induced immunosuppression.
Anxiolytic Effects of Herbal Ethanol Extract from Gynostemma pentaphyllum in Mice after Exposure to Chronic Stress
Hyun Sook Choi,Ting Ting Zhao,Keon Sung Shin,Seung Hwan Kim,Bang Yeon Hwang,Chong Kil Lee,Myung Koo Lee
Molecules , 2013, DOI: 10.3390/molecules18044342
Abstract: In this study, the effects of herbal ethanol extracts of Gynostemma pentaphyllum (GP-EX), on chronic electric footshock (EF) stress-induced anxiety disorders were investigated in mice, which were orally treated with GP-EX (30 mg/kg and 50 mg/kg) once a day for 14 days, followed by exposure to EF stress (2 mA, with an interval and duration of 10 s for 3 min). After the final exposure to EF stress, the elevated plus-maze and marble burying tests were performed, and the levels of dopamine and serotonin in the brain, the serum levels of corticosterone, and the expression of c-Fos in the paraventricular nuclei (PVN) were determined. Treatment with GP-EX (30 mg/kg and 50 mg/kg) significantly recovered the number of entries into open arms and time spent on open arms, which was reduced by chronic EF stress. GP-EX (30 mg/kg and 50 mg/kg) also reduced the number of marbles buried, which was increased by chronic EF stress. In addition, electric EF stress significantly decreased the levels of dopamine and serotonin in the brain, which was recovered by treatment with GP-EX (30 mg/kg and 50 mg/kg). The serum levels of corticosterone, which were markedly increased by chronic EF stress, were reduced by treatment with GP-EX (30 mg/kg and 50 mg/kg). Chronic EF stress-induced increases in c-Fos expression were also markedly reduced by GP-EX (30 mg/kg and 50 mg/kg) in the PVN. These results suggest that GP-EX shows anxiolytic functions, determined by the elevated plus-maze and marble burying tests, which are mediated by modulating the activity of dopamine and serotonin neurons as well as the expression of c-Fos in the brain, and the serum levels of corticosterone. Clinical trials of herbal GP-EX and its bioactive components need further investigation.
Effects of Fructus mume Extract on MAPK and NF-κB Signaling and the Resultant Improvement in the Cognitive Deficits Induced by Chronic Cerebral Hypoperfusion
Won Kyung Jeon,Jinhua Ma,Bo-Ryoung Choi,Seol-Heui Han,Qinghao Jin,Bang Yeon Hwang,Jung-Soo Han
Evidence-Based Complementary and Alternative Medicine , 2012, DOI: 10.1155/2012/450838
Abstract: Fructus mume (F. mume) has been used as a medicinal food in Japan and has been reported to have anti-inflammatory effects in inflammatory bowel disease and macrophage-mediated inflammation. We investigated the effects of F. mume extracts on cognitive dysfunction in rats with chronic cerebral hypoperfusion and the molecular mechanisms underlying these effects. Chronic cerebral hypoperfusion was induced in male Wister rats by bilateral common artery occlusion (BCCAo). Daily administration of F. mume extracts was started on day 20 after post-BCCAo and continued for 40 days. The status of hippocampus-dependent memory was evaluated in control rats, rats with chronic cerebral hypoperfusion, and rats with chronic cerebral hypoperfusion that were administered F. mume. The levels of microglial activation were measured in the hippocampus and the fimbria of hippocampus, and expression levels of hippocampal mitogen-activated protein kinase (MAPK) and nuclear factor-κB (NF-κB) were examined. Rats that received chronic cerebral hypoperfusion showed spatial memory impairments relative to the control rats; these impairments were reduced by daily administration of F. mume. Administration of F. mume mitigated the microglial activation and alterations of hippocampal MAPK and NF-κB signaling in the rats with chronic cerebral hypoperfusion. These results indicate that F. mume may possess therapeutic potential for the prevention of vascular dementia via inhibition of inflammatory processes. 1. Introduction Disorders of cerebral circulation lead to the development of numerous neurological diseases [1]. A moderate but persistent reduction in cerebral blood flow contributes to prolonged cognitive decline and eventually results in the development and progression of vascular dementia (VaD) [2]. VaD is the second most common type of dementia following Alzheimer’s disease (AD), and a pathological characteristic of brain in VaD is neuroinflammation, as seen in the brains of AD patients [3, 4]. Brain tissues from patients with VaD have activated microglia in areas with white matter damage [4–7]. Chronic cerebral hypoperfusion leads to the development of VaD [1]. Permanent bilateral common carotid artery occlusion (BCCAo) has been used extensively to study the role of chronic cerebral hypoperfusion in the development of cognitive decline in VaD, to reveal its underlying mechanism, and to further develop its therapeutic treatments [8–10]. Chronic BCCAo reduces cerebral blood flow and results in cognitive decline, glial activation, and white matter damage similar to those occurring in
Cystatin M loss is associated with the losses of estrogen receptor, progesterone receptor, and HER4 in invasive breast cancer
Eunkyung Ko, Seong-Eun Park, Eun Yoon Cho, Yujin Kim, Jung-Ah Hwang, Yeon-Su Lee, Seok Jin Nam, Saik Bang, Joobae Park, Duk-Hwan Kim
Breast Cancer Research , 2010, DOI: 10.1186/bcr2783
Abstract: The expression of estrogen receptor (ER), progesterone receptor (PR), HER2, HER4, and cystatin M was retrospectively analyzed using immunohistochemistry in 117 patients with ductal carcinoma in situ (DCIS) and in 175 patients with invasive breast cancer (IBC). The methylation status of CST6 gene encoding cystatin M was evaluated using methylation-specific polymerase chain reaction (PCR) in formalin-fixed paraffin-embedded tissues from 292 participants and using pyrosequencing in fresh-frozen tumor and matched normal tissues from 51 IBC patients.Cystatin M loss was found in 9 (8%) of 117 patients with DCIS and in 99 (57%) of 175 with invasive breast cancer (IBC) (P < 0.0001). Cystatin M loss was found in 58 (57%) of 101 HER2-negative IBCs and in 41 (55%) of 74 HER2-positive IBCs, and this difference was not statistically significant (P = 0.97). However, cystatin M loss was significantly associated with the loss of ER (P = 0.01), PR (P = 0.002), and HER4 (P = 0.003) in IBCs. Cystatin M loss occurred in 34 (76%) of the 45 HER4-negative IBCs and in 65 (50%) of the 130 HER4-positive IBCs. Multivariate analysis showed that cystatin M loss occurred at a 3.57 times (95% CI = 1.28 to 9.98; P = 0.01) higher prevalence in the triple-negative IBCs of ER, PR, and HER4 than in other subtypes, after adjusting for age. The quantity of CST6 methylation was associated with ER loss (P = 0.0002) in IBCs but not with the loss of PR (P = 0.64) or HER4 (P = 0.87).The present study suggests that cystatin M loss may be associated with the losses of ER, PR, and HER4 in IBC.Ductal carcinoma in situ (DCIS) of the breast is the most common type of noninvasive breast cancer in women and accounts for 20 to 30% of breast cancer detected by screening mammography [1,2]. Abnormal cells in DCIS are confined to the lactiferous ducts in the breast and do not spread into the surrounding stroma. However, further changes in cells comprising DCIS lesions result in the destruction of the basement membrane th
Exploring the Binding Nature of Pyrrolidine Pocket-Dependent Interactions in the Polo-Box Domain of Polo-Like Kinase 1
Ravichandran N. Murugan, Mija Ahn, Woo Cheol Lee, Hye-Yeon Kim, Jung Hyun Song, Chaejoon Cheong, Eunha Hwang, Ji-Hyung Seo, Song Yub Shin, Sun Ho Choi, Jung-Eun Park, Jeong Kyu Bang
PLOS ONE , 2013, DOI: 10.1371/journal.pone.0080043
Abstract: Background Over the years, a great deal of effort has been focused on the design and synthesis of potent, linear peptide inhibitors targeting the polo-like kinase 1 (Plk1), which is critically involved in multiple mitotic processes and has been established as an adverse prognostic marker for tumor patients. Plk1 localizes to its intracellular anchoring sites via its polo-box domain, and inhibiting the Plk1 polo-box domain has been considered as an approach to circumvent the specificity problems associated with inhibiting the conserved adenosine triphosphate-binding pocket. The polo-box domain consists of two different binding regions, such as the unique, broader pyrrolidine-binding pocket and the conserved, narrow, Tyr-rich hydrophobic channel, among the three Plk polo-box domains (Plks 1–3), respectively. Therefore, the studies that provide insights into the binding nature of the unique, broader pyrrolidine-binding pocket might lead to the development of selective Plk1-inhibitory compounds. Methodology/Principal Findings In an attempt to retain the monospecificity by targeting the unique, broader pyrrolidine-binding pocket, here, for the first time, a systematic approach was undertaken to examine the structure-activity relationship of N-terminal-truncated PLHSpTM derivatives, to apply a site-directed ligand approach using bulky aromatic and non-aromatic systems, and to characterize the binding nature of these analogues using X-ray crystallographic studies. We have identified a new mode of binding interactions, having improved binding affinity and retaining the Plk1 polo-box domain specificity, at the pyrrolidine-binding pocket. Furthermore, our data revealed that the pyrrolidine-binding pocket was very specific to recognize a short and bulky hydrophobic ligand like adamantane, whereas the Tyr-rich hydrophobic channel was specific with lengthy and small hydrophobic groups. Conclusion/Significance The progress made using our site-directed ligands validated this approach to specifically direct the ligand into the unique pyrrolidine-binding region, and it extends the applicability of the strategy for discovering selective protein-protein interaction inhibitors.
Regulation of Microglia Activity by Glaucocalyxin-A: Attenuation of Lipopolysaccharide-Stimulated Neuroinflammation through NF-κB and p38 MAPK Signaling Pathways
Byung-Wook Kim, Sushruta Koppula, Seong-Su Hong, Sae-Bom Jeon, Ji-Hye Kwon, Bang-Yeon Hwang, Eun-Jung Park, Dong-Kug Choi
PLOS ONE , 2013, DOI: 10.1371/journal.pone.0055792
Abstract: Microglial cells are the resident macrophages and intrinsic arm of the central nervous system innate immune defense. Microglial cells become activated in response to injury, infection, environmental toxins, and other stimuli that threaten neuronal survival. Therefore, regulating microglial activation may have therapeutic benefits that lead to alleviating the progression of inflammatory-mediated neurodegeneration. In the present study, we investigated the effect of glaucocalyxin A (GLA) isolated from Rabdosia japonica on the production of pro-inflammatory mediators in lipopolysaccharide (LPS)-stimulated primary microglia and BV-2 cells. GLA significantly inhibited LPS-induced production of nitric oxide and reversed the morphological changes in primary microglia. Further, GLA suppressed expression of inducible nitric oxide synthase and cyclooxygenase-2 dose-dependently at the mRNA and protein levels. The production of proinflammatory cytokines such as tumor necrosis factor-α, interleukin-1β (IL)-1β, and IL-6 were inhibited by suppressing their transcriptional activity. Furthermore, GLA suppressed nuclear factor-κB activation by blocking degradation of IκB-α and inhibited the induction of lipocalin-2 expression in LPS-stimulated BV-2 cells. Mechanistic study revealed that the inhibitory effects of GLA were accompanied by blocking the p38 mitogen activated protein kinase signaling pathway in activated microglia. In conclusion, given that microglial activation contributes to the pathogenesis of neurodegenerative diseases, GLA could be developed as a potential therapeutic agent for treating microglia-mediated neuroinflammatory diseases.
A Decade of Music Therapy in Korea
Eun Young Hwang,Se Yeon Park
Voices: A World Forum for Music Therapy , 2006,
Abstract: The purpose of this study was to investigate the trends of research in music therapy through the analysis of studies from 1997 to 2005, and to make some directions for the future development of music therapy research in Korea. In this study, a total of 488 theses including master's and doctoral degrees, were analyzed by researchers' degree, publication resources, client population, research methods, and research objectives. The results of this study were listed as follows. First, the target theses were categorized as follows; 5 doctoral and 483 master's theses. In other respect, 276 were theses from music therapy programs and 212 were those from other programs. Second, regarding client population, 228 theses were about client with disabilities, 190 with non-disabilities, 29 with medical patients, and 41 others. Third, research methods of each thesis were categorized as 411 quantitative studies, 64 literature studies, 2 qualitative studies, and 11 quantitative-qualitative mixed studies. Fourth, in the target number of research, the field of emotion was the highest with 35%.
Isolation and Characterization of a Defensin-Like Peptide (Coprisin) from the Dung Beetle, Copris tripartitus
Jae-Sam Hwang,Juneyoung Lee,Yeon-Ju Kim,Hea-Son Bang,Eun-Young Yun,Seong-Ryul Kim,Hwa-Jin Suh,Bo-Ram Kang,Sung-Hee Nam,Jae-Pil Jeon,Iksoo Kim,Dong Gun Lee
International Journal of Peptides , 2009, DOI: 10.1155/2009/136284
Abstract: The antibacterial activity of immune-related peptides, identified by a differential gene expression analysis, was investigated to suggest novel antibacterial peptides. A cDNA encoding a defensin-like peptide, Coprisin, was isolated from bacteria-immunized dung beetle, Copris tripartitus, by using differential dot blot hybridization. Northern blot analysis showed that Coprisin mRNA was up-regulated from 4 hours after bacteria injection and its expression level was reached a peak at 16 hours. The deduced amino acid sequence of Coprisin was composed of 80 amino acids with a predicted molecular weight of 8.6 kDa and a pI of 8.7. The amino acid sequence of mature Coprisin was found to be 79.1% and 67.4% identical to those of defensin-like peptides of Anomala cuprea and Allomyrina dichotoma, respectively. We also investigated active sequences of Coprisin by using amino acid modification. The result showed that the 9-mer peptide, LLCIALRKK-NH2, exhibited potent antibacterial activities against Escherichia coli and Staphylococcus aureus.
Page 1 /4386
Display every page Item


Home
Copyright © 2008-2017 Open Access Library. All rights reserved.