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首页> 外文期刊>Canadian Journal of Physiology and Pharmacology >Astaxanthin prevents loss of insulin signaling and improves glucose metabolism in liver of insulin resistant mice
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Astaxanthin prevents loss of insulin signaling and improves glucose metabolism in liver of insulin resistant mice

机译:虾青素可防止胰岛素信号转导的缺失并改善胰岛素抵抗小鼠肝脏中的葡萄糖代谢

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摘要

This study investigates the effects of astaxanthin (ASX) on insulin signaling and glucose metabolism in the liver of mice fed a high fat and high fructose diet (HFFD). Adult male Mus musculus mice of body mass 25-30 g were fed either normal chow or the HFFD. After 15 days, mice in each group were subdivided among 2 smaller groups and treated with ASX (2 mg·(kg body mass)-1) in olive oil for 45 days. At the end of 60 days, HFFD-fed mice displayed insulin resistance while ASX-treated HFFD animals showed marked improvement in insulin sensitivity parameters. ASX treatment normalized the activities of hexokinase, pyruvate kinase, glucose-6-phosphatase, fructose-1,6-bisphosphatase, glycogen phosphorylase, and increased glycogen reserves in the liver. Liver tissue from ASX-treated HFFD-fed animals showed increased tyrosine phosphorylation and decreased serine phosphorylation of insulin receptor substrates (IRS)-1 and -2. ASX increased IRS 1/2 and phosphatidylinositol 3-kinase (PI3K) association and serine phosphorylation of Akt. In addition, ASX decreased HFFD-induced serine kinases (c-jun N-terminal kinase-1 and extracellular signal-regulated kinase-1). The results suggest that ASX treatment promotes the IRS-PI3K-Akt pathway of insulin signaling by decreasing serine phosphorylation of IRS proteins, and improves glucose metabolism by modulating metabolic enzymes.
机译:这项研究调查了虾青素(ASX)对高脂高果糖饮食(HFFD)喂养的小鼠肝脏中胰岛素信号和葡萄糖代谢的影响。给正常体重或HFFD喂食体重为25-30g的成年雄性小家鼠。 15天后,将每组小鼠分为2个较小的组,并用橄榄油中的ASX(2 mg·(kg体重)-1)处理45天。在60天结束时,饲喂HFFD的小鼠显示出胰岛素抵抗,而经ASX处理的HFFD动物显示出胰岛素敏感性参数的显着改善。 ASX治疗使己糖激酶,丙酮酸激酶,葡萄糖6磷酸酶,果糖1,6-双磷酸酶,糖原磷酸化酶和肝糖原储备增加。来自接受ASX处理的HFFD喂养的动物的肝组织显示出酪氨酸磷酸化增加,胰岛素受体底物(IRS)-1和-2的丝氨酸磷酸化降低。 ASX增加了IRS 1/2和磷脂酰肌醇3-激酶(PI3K)的结合以及Akt的丝氨酸磷酸化。此外,ASX降低了HFFD诱导的丝氨酸激酶(c-jun N端激酶-1和细胞外信号调节激酶-1)。结果表明,ASX处理可通过降低IRS蛋白的丝氨酸磷酸化来促进胰岛素信号转导的IRS-PI3K-Akt途径,并通过调节代谢酶来改善葡萄糖代谢。

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