- 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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- 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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Citations
Citations to this article as recorded by  - 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
- 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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Abstract
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- BACKGROUND
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.
- The influence of pulmonary tuberculosis in the patients under anti-tuberculosis treatment on the diabetic painful peripheral polyneuropathy.
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Seung Young Kim, Dong Joon Kim, Duk Hee Han, Sang Jeon Choi, Ryung Joon Yoo
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Korean Diabetes J. 1992;16(3):215-220. Published online January 1, 2001
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- No abstract available.
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