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Vitamin D3 potentiates the nephroprotective effects of metformin in a rat model of metabolic syndrome: role of AMPK/SIRT1 activation and DPP-4 inhibition

机译:维生素D3增强了二甲双胍在代谢综合征大鼠模型中的肾反应作用:AMPK / SIRT1激活和DPP-4抑制的作用

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The current study aimed to investigate the molecular mechanisms of metformin and vitamin D3-induced nephroprotection in a metabolic syndrome (MetS) rat model, evaluating the capacity of vitamin D3 to potentiate metformin action. MetS was induced by 10% fructose in drinking water and 3% salt in the diet. After 6 weeks, serum lipid profile and uric acid were measured, an oral glucose tolerance test (OGTT) was performed, and kidney function was investigated. In conjunction with the same concentrations of fructose and salt feeding, MetS rats with significant weight gain, dyslipidemia, hyperuricemia, and dysglycemia were treated orally with metformin (200 mg/kg), vitamin D3 (10 lg/kg), or both daily for 6 weeks. At the end of the study period, anthropometrical parameters were recorded, OGTT was reperformed, urine and blood samples were collected, and tissue samples were harvested at sacrifice. MetS rats showed dramatically declined renal function, enhanced intrarenal oxidative stress and inflammation, and extravagant renal histopathological damage with interstitial fibrosis. Metformin and vitamin D3 significantly reversed all the aforementioned deleterious effects in MetS rats. The study has verified the nephroprotective effects of metformin and vitamin D3 in MetS, accentuating the critical role of AMP-activated protein kinase/sirtuin-1 activation and dipeptidyl peptidase-4 inhibition. Given the synergistic effects of the combination, vitamin D3 is worth being investigated as an additional therapeutic agent for preventing MetS-induced nephropathy.
机译:本研究旨在研究二甲双胍和维生素D3在代谢综合征(MetS)大鼠模型中诱导肾保护的分子机制,评估维生素D3增强二甲双胍作用的能力。MetS是由饮用水中10%的果糖和饮食中3%的盐诱导的。6周后,测量血脂和尿酸,进行口服葡萄糖耐量试验(OGTT),并检查肾功能。结合相同浓度的果糖和盐喂养,对体重显著增加、血脂异常、高尿酸血症和血糖异常的MetS大鼠口服二甲双胍(200 mg/kg)、维生素D3(10 lg/kg),或每天同时服用,持续6周。在研究结束时,记录人体测量参数,重新形成OGTT,收集尿液和血液样本,并在牺牲时采集组织样本。MetS大鼠肾功能显著下降,肾内氧化应激和炎症增强,肾组织病理学损伤严重,伴有间质纤维化。二甲双胍和维生素D3在MetS大鼠中显著逆转了上述所有有害影响。该研究证实了二甲双胍和维生素D3对二甲双胍的肾脏保护作用,强调了AMP活化蛋白激酶/sirtuin-1激活和二肽基肽酶-4抑制的关键作用。鉴于联合用药的协同效应,维生素D3作为预防MetS诱发肾病的额外治疗剂值得研究。

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