- Cloning of Novel Epidermal Growth Factor (EGF) Plasmid for Gene Therapy on Diabetic Foot Ulcer.
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Hye Sook Chung, Chang Shin Yoon, Min Jeong Kwon, Mi Kyung Kim, Soon Hee Lee, Kyung Soo Ko, Byung Doo Rhee, Jeong Hyun Park
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Korean Diabetes J. 2008;32(2):131-140. Published online April 1, 2008
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DOI: https://doi.org/10.4093/kdj.2008.32.2.131
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- BACKGROUND
Epidermal Growth Factor (EGF) is one of the important growth factors involved in the epithelialization during cutaneous wound healing. Peptide EGF has been used for the treatment of diabetic foot ulcer. But the inferiority of cost-effectiveness and the inconvenience of daily application might have restricted its wide clinical usage. EGF gene therapy could dramatically improve the efficacy and inconvenience through long-term expression and bypassing the EGF degradation by hostile non-specific proteinases expressed in the wound bed. METHODS: EGF DNAs were amplified via PCR. For the more effective secretion from the transfected cell, we inserted furin cleavage site into EGF plasmids. The efficacy of novel plasmid pbeta-EGF was verified by transfection into the various animal cell lines, and the biologic potency of expressed EGF was confirmed via phosphorylation of PI3K and GSK3beta by Western blotting. RESULTS: We tested various kinds of human EGFs. One of the human EGF isoforms, EGF(828) including a membrane-anchoring domain was successfully released as the mature EGF protein in the cell culture media. Also EGF plasmid including furin cleavage site showed more than 2-fold increased EGF expression compared with the sequence without furin cleavage site. CONCLUSION: In conclusion, these findings suggest that mature EGF could be released easily out of cells by modifying EGF DNA sequence. Our novel EGF plasmid DNA could markedly increase the efficiency of non-viral gene therapy for diabetic foot ulcer.
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- Effective healing of diabetic skin wounds by using nonviral gene therapy based on minicircle vascular endothelial growth factor DNA and a cationic dendrimer
Min J. Kwon, Songhie An, Sunghyun Choi, Kihoon Nam, Hye S. Jung, Chang S. Yoon, Jung H. Ko, Hye J. Jun, Tae K. Kim, Soo J. Jung, Jeong H. Park, Yan Lee, Jong‐Sang Park The Journal of Gene Medicine.2012; 14(4): 272. CrossRef
- The Protective Effect of EGCG on INS-1 Cell in the Oxidative Stress and Mechanism.
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Mi Kyung Kim, Hye Sook Jung, Chang Shin Yoon, Min Jeong Kwon, Kyung Soo Koh, Byung Doo Rhee, Jeong Hyun Park
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Korean Diabetes J. 2008;32(2):121-130. Published online April 1, 2008
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DOI: https://doi.org/10.4093/kdj.2008.32.2.121
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2,309
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- BACKGROUND
Oxidative stress is important in both diabetic complications and the development and the progression of type 2 diabetes via the effects on the pancreatic beta-cells. EGCG (epigallocatechin galleate), a major constituent of green tea, has been known to have beneficial effects on various diseases through the mechanisms of antioxidant and cell signaling modulation. But, very small numbers of studies were published about the direct effects of EGCG on the pancreatic beta cell lines. We performed this study to see the protective effect of EGCG on pancreatic beta cell line under H2O2 and the mechanisms of this phenomenon. METHODS: We used INS-1 cells and hydrogen peroxide as an oxidative stressor. Their viabilities were verified by MTT assay and FACS. The activity of glutathione peroxidase was assessed by total glutathione quantification kit. Western blot and semi-quantitative RT-PCR for the catalase, SOD (superoxide dismutase), PI3K and Akt were performed. Functional status of INS-1 cells was tested by GSIS (glucose stimulated insulin secretion). RESULTS: The biological effects of EGCG were different according to its concentrations. 10 micrometer EGCG effectively protected hydrogen peroxide induced damage in INS-1 cells. The expression and the activity of SOD, catalase and the glutathione peroxidase were significantly increased by EGCG. EGCG significantly increased PI3K and Akt activity and its effect was inhibited partially by wortmannin. GSIS was well preserved by EGCG. CONCLUSION: EGCG in low concentration effectively protected INS-1 cells from the oxidative stress through the activation of both antioxidant systems and anti-apoptosis signaling. Further studies will be necessary for the more detailed mechanisms and the clinical implications.
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- Suppressive Effects of Epigallocatechin Gallate Pretreatment on the Expression of Inflammatory Cytokines in RAW264.7 Cells Activated by Lipopolysaccharide
Eun Ji Seo, Jun Go, Ji Eun Kim, Eun Kyoung Koh, Sung Hwa Song, Ji Eun Sung, Chan Kyu Park, Hyun Ah Lee, Dong Seob Kim, Hong Joo Son, Cung Yeoul Lee, Hee Seob Lee, Dae Youn Hwang Journal of Life Science.2015; 25(9): 961. CrossRef - The Protective Effects of Chrysanthemum cornarium L. var. spatiosum Extract on HIT-T15 Pancreatic β-Cells against Alloxan-induced Oxidative Stress
In-Hye Kim, Kang-Jin Cho, Jeong-Sook Ko, Jae-Hyun Kim, Ae-Son Om The Korean Journal of Food And Nutrition.2012; 25(1): 123. CrossRef - Protective Effects of Sasa Borealis Leaves Extract on High Glucose-Induced Oxidative Stress in Human Umbilical Vein Endothelial Cells
Ji-Young Hwang, Ji-Sook Han Journal of the Korean Society of Food Science and Nutrition.2010; 39(12): 1753. CrossRef
- Cytoprotective Effect by Antioxidant Activity of Quercetin in INS-1 Cell Line.
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Min Jeong Kwon, Hye Sook Jung, Mi Kyung Kim, Seong Hoon Kang, Gwang Wook Seo, Jae Kwang Song, Tae Yeon Yoon, Min Kyeong Jeon, Tae Hwan Ha, Chang Shin Yoon, Mi Kyung Kim, Woo Je Lee, Jeong Hyun Noh, Soo Kyung Kwon, Dong Joon Kim, Kyung Soo Koh, Byung Doo Rhee, Kyung Ho Lim, Soon Hee Lee, Jeong Hyun Park
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Korean Diabetes J. 2007;31(5):383-390. Published online September 1, 2007
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DOI: https://doi.org/10.4093/jkda.2007.31.5.383
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2,794
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- BACKGROUND
Oxidative stress is induced under diabetic conditions and causes various forms of tissue damages in the patients with diabetes. Recently, pancreatic beta cells are regarded as a putative target of oxidative stress-induced tissue damage, and this seems to explain in part the progressive deterioration of beta cell function in type 2 diabetes. The aim of this study was to examine the potential of Quercetin (QE) to protect INS-1 cells from the H2O2-induced oxidative stress and the effects of QE on the glucose-stimulated insulin secretion in INS-1 cells. METHODS: To study the cell viability, cells were incubated with H2O2 and/or QE at the various concentrations. To confirm the protective effect by QE in response to H2O2, the levels of antioxidant enzymes were assessed by RT-PCR and Western blot, and glutathione peroxidase activities were quantified by spectrophotometrical method. Glucose-stimulated insulin secretion (GSIS) was measured by ELISA. RESULTS: Cell incubations were performed with 80 microM of H2O2 for 5 hours to induce 40 - 50% of cell death. QE gradually showed protective effect (IC50 = 50 microM) in dose-dependent manner. Superoxide dismutase (SOD) mRNA level in H2O2 + QE group was increased as compared to H2O2 group, but catalase did not changed. And the QE recruited glutathione peroxidase activity against H2O2-induced oxidative injuries in INS-1 cells. CONCLUSION: In conclusion, these findings suggest that QE might have protective effect on beta cells by ameliorating oxidative stress and preserving insulin secretory function.
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- Anti-diabetic effects of Allium tuberosum rottler extracts and lactic acid bacteria fermented extracts in type 2 diabetic mice model
Bae Jin Kim, Seung Kyeung Jo, Yoo Seok Jeong, Hee Kyoung Jung Korean Journal of Food Preservation.2015; 22(1): 134. CrossRef - Protective Effects of Sasa Borealis Leaves Extract on High Glucose-Induced Oxidative Stress in Human Umbilical Vein Endothelial Cells
Ji-Young Hwang, Ji-Sook Han Journal of the Korean Society of Food Science and Nutrition.2010; 39(12): 1753. CrossRef
- Analysis of the Body Mass Index of Newly Diagnosed Type 2 Diabetic Patients and Its Temporal Trends.
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Ji Hye Suk, Jung Choi, Yong Wuk Kim, Jae Suk Park, Ji Sup Kim, Mi Kyung Kim, Sin Yeong Choi, Jeong Hyun Park, Byung Doo Rhee
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Korean Diabetes J. 2003;27(2):132-140. Published online April 1, 2003
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Previous epidemiological studies have shown that Korean type 2 diabetic patients were mainly non-obese compared to their Western counterparts. This retrospective study was performed to find the percentage of obese type 2 diabetic patients, and its temporal changes, using the newly proposed Asian criteria for the diagnosis of obesity. In addition, our results were compared with Caucasian data. METHODS: The subjects of our study were all newly diagnosed type 2 diabetic patients; 157 for 1991, 176 for 1996 and 275 for 2001. The all the study subjects were aged over 30 years. They all had visited the Mary Knoll General Hospital for the first time, and were diagnosed with type 2 diabetes mellitus within 1 year. The maximum BMI (Body Mass Index) was calculated from the patients heaviest life-time body weight, and their current BMI from the values obtained at their first visit to our institution. The delta BMI (deltaBMI) was calculated by subtracting the current BMI from the maximum BMI the HbA1c value at the time of the first visit was also recorded. Obesity was defined as a body mass index greater than 25kg/m2. RESULTS: The mean values of maximum BMI were 25.7+/-4.5, 26.4+/-4.3 and 25.9+/-6.0 kg/m2 for the years of 1991, 1996 and 2001, respectively. The mean values of the current BMI were 24.0+/-3.0, 24.2+/-3.0 and 24.8+/-3.6 kg/m2 for the years of 1991, 1996 and 2001, respectively. None of these values showed statistically significant differences. The percentages of obese type 2 diabetic patients in 1991, 1996 and 2001 were 64.3, 69.0 and 66.9%, according to their maximum BMI, respectively. The percentages of obese type 2 diabetic patients, from their current BMI, were 31.8, 39.8 and 43.6% in 1991, 1996 and 2001, respectively, and these values showed statistically significant increases over time (p=0.016). The mean value of the delta BMI was significantly lower in 2001 compared with 1996, and it was positively correlated with the HbA1c at the time of the first visit (p< 0.01). CONCLUSION: The percentage of obese type 2 diabetic patients at the time of the maximum body weight was 60 to 70%, but the percentage at the time of diagnosis had decreased to 30 to 40%. The percentage of obese type 2 diabetic patients at the time of diagnosis significantly increased over time. The mean BMI value of the Korean type 2 diabetic patients was lower than that of Caucasians, but the percentage of obese type 2 diabetic patients and its temporal trends were similar to those of Caucasians. Our study shows that Korean type 2 diabetic patients are as obese as Caucasians when they meet their own diagnostic criteria for obesity.
- Serum Uric Acid Levels and Insulin Resistance Syndrome in the People Living at Kijang County of Busan City.
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Bo Young Yoon, Doo Geun Chai, Sung Mok Kim, Moon Suk Cho, Dong Joon Kim, Jeong Hyun Park, Byung Doo Rhee, Kyung Ho Lim, Chang Il Kang
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Korean Diabetes J. 2001;25(4):307-315. Published online August 1, 2001
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Insulin resistance syndrome is defined as the constellation of central obesity, hypertension, glucose abnormality and dyslipidemia. Other constituents of insulin resistance syndrome have recently been reported including serum uric acid. Causative correlation between serum uric acid and insulin resistance syndrome is still not clear. We performed epidemiologic study to clarify its correlation with insulin resistance syndrome in the people living at Kijang district of Busan City. METHODS: We performed volunteer study of the people living at Kijang district of Busan City from 16th to 19th day of November in 1998 (n=232). Height, body weight, abdominal and hip circumference, and blood pressure were measured. We also measured fasting blood glucose, fasting serum insulin (Linco RIA), HDL-cholesterol, triglyceride, total cholesterol and serum uric acid. Insulin resistance was calculated by HOMA (homeostasis model assessment) method. RESULTS: Total number of subjects were 232 (male 61, female 171), and their mean age was 5.1+/-13.4 (years), BMI (body mass index) 23.4+/-3.2 kg/m2, and WHR (waist to hip ratio) 0.82+/-0.07. Mean HOMA-IR value derived from fasting blood glucose and insulin was 2.5+/-2.4, mean serum uric acid was 270+/-72 mol/L. The serum uric acid level showed positive correlation with BMI (r=.324), WHR (r=.403), log transformed triglyceride value (r=.135), systolic blood pressure (r=.181), diastolic blood pressure (r=.185) and negative correlation with HDL-cholesterol (r=-.185,p<0.01). Stepwise linear regression revealed that only serum creatinine, WHR and natural logarithmic value of triglyceride showed statistically independent correlation with serum uric acid level. CONCLUSION: Serum uric acid level in the people living at Kijang district of Busan City showed statistically significant correlation with other well-known constituents of insulin resistance syndrome. Thus, we may conclude that the level of serum uric acid can be regarded as the component of insulin resistance syndrome in the people living at Kijang district. However, its relationship with insulin resistance syndrome may be indirect.
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