Disrupted erythropoietin signalling promotes obesity and alters hypothalamus proopiomelanocortin production.

Disrupted erythropoietin signalling promotes obesity and alters hypothalamus proopiomelanocortin production.
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DOI:
10.1038/ncomms1526
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发表时间:
2011-11-01
影响因子:
16.6
通讯作者:
--
中科院分区:
综合性期刊1区
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虽然促红细胞生成素是已知的调节红细胞生成的细胞因子,但促红细胞生成素受体(EpoR)表达和造血组织以外的相关活性仍然不确定。在这里,我们表明,小鼠EpoR的表达局限于造血组织(Tg)发展肥胖和胰岛素抵抗。TG-小鼠表现出能量消耗的减少和白色脂肪质量和脂肪细胞数量的增加。相反,野生型小鼠的促红细胞生成素治疗增加能量消耗并减少食物摄入和脂肪量积累,但对Tg小鼠的体重没有影响。EpoR在白色脂肪组织和下丘脑的前阿黑皮素神经元中以高水平表达。虽然野生型小鼠中的Epo治疗诱导多肽激素前体基因阿黑皮素原的表达,但缺乏EpoR的小鼠显示下丘脑中阿黑皮素原的水平降低。这项研究提供了第一个证据表明,在非造血组织中缺乏EpoR的小鼠变得肥胖和胰岛素抵抗,并失去了红细胞生成素对能量稳态的调节。
While erythropoietin is the cytokine known that regulates erythropoiesis, erythropoietin receptor (EpoR) expression and associated activity beyond hematopoietic tissue remain uncertain. Here we show that mice with EpoR expression restricted to hematopoietic tissues (Tg) develop obesity and insulin resistance. Tg-mice exhibit a decrease in energy expenditure and an increase in white fat mass and adipocyte number. Conversely, erythropoietin treatment of wild-type mice increases energy expenditure and reduces food intake and fat mass accumulation but showed no effect in body weight of Tg-mice. EpoR is expressed at a high level in white adipose tissue and in the proopiomelanocortin neurons of the hypothalamus. While Epo treatment in wild-type mice induces the expression of the polypeptide hormone precursor gene, proopiomelanocortin, mice lacking EpoR show reduced levels of proopiomelanocortin in the hypothalamus. This study provides the first evidence that mice lacking EpoR in nonhematopoietic tissue become obese and insulin resistant with loss of erythropoietin regulation of energy homeostasis.
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