Transcriptional control of adipose lipid handling by IRF4.

Transcriptional control of adipose lipid handling by IRF4.
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DOI:
10.1016/j.cmet.2011.02.005
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发表时间:
2011-03-02
期刊:
影响因子:
29
通讯作者:
Rosen ED
Rosen ED
中科院分区:
生物学1区
文献类型:
--
作者:
Eguchi J;Wang X;Yu S;Kershaw EE;Chiu PC;Dushay J;Estall JL;Klein U;Maratos-Flier E;Rosen ED

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脂肪细胞在营养丰富期间储存甘油三酯,并在禁食期间通过脂肪生成和脂解的协调循环释放游离脂肪酸。虽然我们对禁食和进食期间这些过程的急性调节了解很多,但对脂肪细胞控制脂质处理的转录基础了解较少。在这里,我们表明,干扰素调节因子4(IRF4)是一个关键的决定因素的转录反应的营养供应脂肪细胞。禁食以胰岛素和FoxO1依赖性方式诱导IRF4。IRF4是脂解所必需的,至少部分是由于对脂肪细胞甘油三酯脂肪酶和脂肪酶敏感性脂肪酶的表达的直接影响。相反,IRF4的减少增强脂质合成。缺乏脂肪细胞IRF4的小鼠表现出肥胖增加和脂肪分解不足。这些研究建立了IRF4与脂肪组织中卡路里分布之间的联系,并对全身代谢稳态产生影响。
Adipocytes store triglyceride during periods of nutritional affluence and release free fatty acids during fasting through coordinated cycles of lipogenesis and lipolysis. While much is known about the acute regulation of these processes during fasting and feeding, less is understood about the transcriptional basis by which adipocytes control lipid handling. Here we show that interferon regulatory factor 4 (IRF4) is a critical determinant of the transcriptional response to nutrient availability in adipocytes. Fasting induces IRF4 in an insulin- and FoxO1-dependent manner. IRF4 is required for lipolysis, at least in part due to direct effects on the expression of adipocyte triglyceride lipase and hormone-sensitive lipase. Conversely, reduction of IRF4 enhances lipid synthesis. Mice lacking adipocyte IRF4 exhibit increased adiposity and deficient lipolysis. These studies establish a link between IRF4 and the disposition of calories in adipose tissue, with consequences for systemic metabolic homeostasis.
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