کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
10736840 | 1046274 | 2013 | 8 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Genipin ameliorates age-related insulin resistance through inhibiting hepatic oxidative stress and mitochondrial dysfunction
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کلمات کلیدی
kittMMPMDAT2DMBCA2,7-dichlorofluorescein diacetate - 2،7-دی کرول فلوئورسین دی سکتهH2DCFDA - H2DCFD بهJNK/SAPK - JNK / SAPKROS - ROSAdenosine tri-phosphate - آدنوزین تری فسفاتATP - آدنوزین تری فسفات یا ATPAkt - آکتbicinchoninic acid - بیسینکنینیک اسیدTriacylglycerols - ترشیال گلیسیرینOxidative stress - تنش اکسیداتیوType 2 diabetes mellitus - دیابت نوع دوAging - سالخوردگیmalondialdehyde - مالون دی آلدهیدInsulin resistance - مقاومت به انسولینMitochondria - میتوکندریاMitochondrial membrane potential - پتانسیل غشای میتوکندریGenipin - ژنپینtotal cholesterol - کلسترول تامReactive oxygen species - گونههای فعال اکسیژن
موضوعات مرتبط
علوم زیستی و بیوفناوری
بیوشیمی، ژنتیک و زیست شناسی مولکولی
سالمندی
پیش نمایش صفحه اول مقاله

چکیده انگلیسی
Insulin resistance (IR) increases with age and plays a key role in the pathogenesis of type 2 diabetes mellitus. Oxidative stress and mitochondrial dysfunction are supposed to be major factors leading to age-related IR. Genipin, an extract from Gardenia jasminoides Ellis fruit, has been reported to stimulate insulin secretion in pancreatic islet cells by regulating mitochondrial function. In this study, we first investigated the effects of genipin on insulin sensitivity and the potential mitochondrial mechanisms in the liver of aging rats. The rats were randomly assigned to receive intraperitoneal injections of either 25Â mg/kg genipin or vehicle once daily for 12Â days. The aging rats showed hyperinsulinemia and hyperlipidemia, and insulin resistance as examined by the decreased glucose decay constant rate during insulin tolerance test (kITT). The hepatic tissues showed steatosis and reduced glycogen content. Hepatic malondialdehyde level and mitochondrial reactive oxygen species (ROS) were higher, and levels of mitochondrial membrane potential (MMP) and ATP were lower as compared with the normal control rats. Administration of genipin ameliorated systemic and hepatic insulin resistance, alleviated hyperinsulinemia, hyperglyceridemia and hepatic steatosis, relieved hepatic oxidative stress and mitochondrial dysfunction in aging rats. Furthermore, genipin not only improved insulin sensitivity by promoting insulin-stimulated glucose consumption and glycogen synthesis, inhibited cellular ROS overproduction and alleviated the reduction of levels of MMP and ATP, but also reversed oxidative stress-associated JNK hyperactivation and reduced Akt phosphorylation in palmitate-treated L02 hepatocytes. In conclusion, genipin ameliorates age-related insulin resistance through inhibiting hepatic oxidative stress and mitochondrial dysfunction.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Experimental Gerontology - Volume 48, Issue 12, December 2013, Pages 1387-1394
Journal: Experimental Gerontology - Volume 48, Issue 12, December 2013, Pages 1387-1394
نویسندگان
Lili Guan, Haiyan Feng, Dezheng Gong, Xu Zhao, Li Cai, Qiong Wu, Bo Yuan, Mei Yang, Jie Zhao, Yuan Zou,