Protection from obesity and diabetes by blockade of TGF-β/Smad3 signaling.

Protection from obesity and diabetes by blockade of TGF-β/Smad3 signaling.
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DOI:
10.1016/j.cmet.2011.04.013
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发表时间:
2011-07-06
期刊:
影响因子:
29
通讯作者:
Rane SG
Rane SG
中科院分区:
生物学1区
文献类型:
--
作者:
Yadav H;Quijano C;Kamaraju AK;Gavrilova O;Malek R;Chen W;Zerfas P;Zhigang D;Wright EC;Stuelten C;Sun P;Lonning S;Skarulis M;Sumner AE;Finkel T;Rane SG

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葡萄糖和能量稳态失衡是全球肥胖和糖尿病流行的核心。在这里,我们阐述了 TGF-β/Smad3 信号通路在调节葡萄糖和能量稳态中的重要作用。 Smad3 缺陷小鼠可以免受饮食引起的肥胖和糖尿病的影响。有趣的是,代谢保护伴随着 Smad3−/− 白色脂肪组织获得棕色脂肪/骨骼肌的生物能和基因表达谱。 Smad3−/− 脂肪细胞表现出线粒体生物合成显着增加,基础呼吸相应增加,并且 Smad3 充当 PGC-1α 表达的抑制因子。我们观察到啮齿动物和人类的 TGF-β1 水平与肥胖之间存在显着相关性。此外,系统性阻断 TGF-β1 信号传导可保护小鼠免受肥胖、糖尿病和肝脂肪变性的影响。总之,这些结果表明 TGF-β 信号传导可调节葡萄糖耐量和能量稳态,并表明调节 TGF-β1 活性可能是肥胖和糖尿病的有效治疗策略。
Imbalances in glucose and energy homeostasis are at the core of the worldwide epidemic of obesity and diabetes. Here, we illustrate an important role of the TGF-β/Smad3 signaling pathway in regulating glucose and energy homeostasis. Smad3 deficient mice are protected from diet-induced obesity and diabetes. Interestingly, the metabolic protection is accompanied by Smad3−/− white adipose tissue acquiring the bioenergetic and gene expression profile of brown fat/skeletal muscle. Smad3−/− adipocytes demonstrate a marked increase in mitochondrial biogenesis, with a corresponding increase in basal respiration, and Smad3 acts as a repressor of PGC-1α expression. We observe significant correlation between TGF-β1 levels and adiposity in rodents and humans. Further, systemic blockade of TGF-β1 signaling protects mice from obesity, diabetes and hepatic steatosis. Together, these results demonstrate that TGF-β signaling regulates glucose tolerance and energy homeostasis and suggest that modulation of TGF-β1 activity might be an effective treatment strategy for obesity and diabetes.
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