SIRT1 Activation by Resveratrol Alleviates Cardiac Dysfunction via Mitochondrial Regulation in Diabetic Cardiomyopathy Mice.

SIRT1 Activation by Resveratrol Alleviates Cardiac Dysfunction via Mitochondrial Regulation in Diabetic Cardiomyopathy Mice.
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白藜芦醇激活SIRT1通过糖尿病心肌病小鼠的线粒体调节来减轻心脏功能障碍。

DOI:
10.1155/2017/4602715
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发表时间:
2017
影响因子:
--
通讯作者:
Cao F
Cao F
中科院分区:
生物学2区
文献类型:
--
作者:
Ma S;Feng J;Zhang R;Chen J;Han D;Li X;Yang B;Li X;Fan M;Li C;Tian Z;Wang Y;Cao F

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糖尿病心肌病(DCM)是糖尿病患者的主要威胁。沉默信息调节因子1(SIRT 1)对线粒体动力学具有调节作用,与DCM的病理改变有关。我们的研究旨在探讨SRIT 1激活剂白藜芦醇是否可以对DCM发挥保护作用。 使用Cre-loxP系统产生心脏特异性SIRT 1敲除(SIRT 1 KO)小鼠。SIRT 1 KO小鼠表现出DCM的症状,包括心脏肥大和功能障碍、胰岛素抵抗和葡萄糖代谢异常。DCM和SIRT 1 KO心脏表现出线粒体生物发生和功能受损,而白藜芦醇激活SIRT 1逆转了DCM小鼠的这种情况。高糖导致心肌细胞凋亡增加,线粒体生物合成受损,功能受损,白藜芦醇可缓解。通过SIRT 1 KO和shRNA删除SIRT 1消除了白藜芦醇的有益作用。此外,SIRT 1的功能是通过对过氧化物酶体增殖物激活受体γ共激活因子1-α(PGC-1α)的脱乙酰作用介导的,从而诱导核呼吸因子1(NRF-1)、NRF-2、雌激素相关受体-α(ERR-α)和线粒体转录因子A(TFAM)的表达增加。 心脏SIRT 1的缺失导致类似DCM的表型。白藜芦醇激活SIRT 1通过PGC-1α介导的线粒体调节减轻DCM心肌损伤。总的来说,SIRT 1可以作为DCM的潜在治疗靶点。
Diabetic cardiomyopathy (DCM) is a major threat for diabetic patients. Silent information regulator 1 (SIRT1) has a regulatory effect on mitochondrial dynamics, which is associated with DCM pathological changes. Our study aims to investigate whether resveratrol, a SRIT1 activator, could exert a protective effect against DCM. Cardiac-specific SIRT1 knockout (SIRT1KO) mice were generated using Cre-loxP system. SIRT1KO mice displayed symptoms of DCM, including cardiac hypertrophy and dysfunction, insulin resistance, and abnormal glucose metabolism. DCM and SIRT1KO hearts showed impaired mitochondrial biogenesis and function, while SIRT1 activation by resveratrol reversed this in DCM mice. High glucose caused increased apoptosis, impaired mitochondrial biogenesis, and function in cardiomyocytes, which was alleviated by resveratrol. SIRT1 deletion by both SIRT1KO and shRNA abolished the beneficial effects of resveratrol. Furthermore, the function of SIRT1 is mediated via the deacetylation effect on peroxisome proliferator-activated receptor gamma coactivator 1-alpha (PGC-1α), thus inducing increased expression of nuclear respiratory factor 1 (NRF-1), NRF-2, estrogen-related receptor-α (ERR-α), and mitochondrial transcription factor A (TFAM). Cardiac deletion of SIRT1 caused phenotypes resembling DCM. Activation of SIRT1 by resveratrol ameliorated cardiac injuries in DCM through PGC-1α-mediated mitochondrial regulation. Collectively, SIRT1 may serve as a potential therapeutic target for DCM.
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