Cell Rep:BCL10是胰岛素抵抗的关键蛋白

2012-05-25 Beyond 生物谷

高脂肪食物可导致肥胖从而增加了罹患2型糖尿病的风险。更好地理解身体对高脂饮食可能产生的反应会促进用于治疗糖尿病和代谢综合征的新治疗方法的开发。 近日,研究者了解到BCL10是对游离脂肪酸非常关键的蛋白,游离脂肪酸存在于高脂肪食物中,并储存在体内的脂肪,有损害胰岛素的作用,并会导致异常高血糖。 这项实验研究中,BCL10缺乏的小鼠在喂食高脂肪的饮食时不容易发生的胰岛素抵抗。研究结果将发表在5

高脂肪食物可导致肥胖从而增加了罹患2型糖尿病的风险。更好地理解身体对高脂饮食可能产生的反应会促进用于治疗糖尿病和代谢综合征的新治疗方法的开发。

近日,研究者了解到BCL10是对游离脂肪酸非常关键的蛋白,游离脂肪酸存在于高脂肪食物中,并储存在体内的脂肪,有损害胰岛素的作用,并会导致异常高血糖。

这项实验研究中,BCL10缺乏的小鼠在喂食高脂肪的饮食时不容易发生的胰岛素抵抗。研究结果将发表在5月31日的Cell Reports杂志上。

胰岛素有助于控制血糖,但胰岛素抵抗会导致异常高血糖水平,异常高血糖水平是糖尿病的标志。胰岛素抵抗可能在代谢综合征中也存在,会增加2型糖尿病和心脏疾病的风险。

密歇根大学病理学副教授Peter C. Lucas说: 这项研究还揭示了短期改变饮食如高脂肪的饮食只持续几天甚至更少是如何诱发胰岛素抵抗状态的。

研究人员起初是研究游离脂肪酸如何引起炎症、损害肝脏中胰岛素作用的。研究人员认为肝脏是游离脂肪酸的主要损害器官。

在肝脏中,游离脂肪酸经过新陈代谢以产生甘油二酯,诱导炎症反应。

甘油二酯也激活与癌症、代谢和血管疾病有关联的NF-kB信号。

该研究小组得出的结论是BCL10对脂肪酸诱发肝脏炎症和胰岛素抵抗很重要。在这项研究中,BCL10缺陷小鼠调节血糖功能得到显著改善。

doi:10.1016/j.celrep.2012.04.006
PMC:
PMID:

Bcl10 Links Saturated Fat Overnutrition with Hepatocellular NF-kB Activation and Insulin Resistance

Matthew Van Beek, Katherine I. Oravecz-Wilson, Phillip C. Delekta, Shufang Gu, Xiangquan Li, Xiaohong Jin, Ingrid J. Apel, Katy S. Konkle, Yongjia Feng, Daniel H. Teitelbaum, Jürgen Ruland, Linda M. McAllister-Lucas,et al.

Excess serum free fatty acids (FFAs) are fundamental to the pathogenesis of insulin resistance. With high-fat feeding, FFAs activate NF-B in target tissues, initiating negative crosstalk with insulin signaling. However, the mechanisms underlying FFA-dependent NF-B activation remain unclear. Here, we demonstrate that the saturated FA, palmitate, requires Bcl10 for NF-B activation in hepatocytes. Uptake of palmitate, metabolism to diacylglycerol, and subsequent activation of protein kinase C (PKC) appear to mechanistically link palmitate with Bcl10, known as a central component of a signaling complex that, along with CARMA3 and MALT1, activates NF-B downstream of selected cell surface receptors. Consequently, Bcl10-deficient mice are protected from hepatic NF-B activation and insulin resistance following brief high-fat diet, suggesting that Bcl10 plays a major role in the metabolic consequences of acute overnutrition. Surprisingly, while CARMA3 also participates in the palmitate response, MALT1 is completely dispensable, thereby revealing an apparent nonclassical role for Bcl10 in NF-B signaling.

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    2013-02-23 baoya
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    2013-04-22 维他命

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