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Seipin promotes adipose tissue fat storage through the ER Ca 2+-ATPase SERCA

机译:Seipin通过ER Ca 2 + -ATPase SERCA促进脂肪组织脂肪的储存

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摘要

Adipose tissue is central to the regulation of lipid metabolism. Berardinelli-Seip congenital lipodystrophy type 2 (BSCL2), one of the most severe lipodystrophy diseases, is caused by mutation of the Seipin gene. Seipin plays an important role in adipocyte differentiation and lipid homeostasis, but its exact molecular functions are still unknown. Here, we show that Seipin physically interacts with the sarco/endoplasmic reticulum Ca2+-ATPase (SERCA) in both Drosophila and man. SERCA, an endoplasmic reticulum (ER) calcium pump, is solely responsible for transporting cytosolic calcium into the ER lumen. Like dSeipin, dSERCA cell-autonomously promotes lipid storage in Drosophila fat cells. dSeipin affects dSERCA activity and modulates intracellular calcium homeostasis. Adipose tissue-specific knockdown of the ER-to-cytosol calcium release channel ryanodine receptor (RyR) partially restores fat storage in dSeipin mutants. Our results reveal that Seipin promotes adipose tissue fat storage by regulating intracellular calcium homeostasis.
机译:脂肪组织对于脂质代谢的调节至关重要。 Berardinelli-Seip型先天性脂肪营养不良2型(BSCL2)是最严重的脂肪营养不良疾病之一,由Seipin基因突变引起。脂蛋白在脂肪细胞分化和脂质稳态中起着重要作用,但其确切的分子功能仍是未知的。在这里,我们表明,果蝇和果蝇中的Seipin与肌浆网/内质网Ca2 + -ATPase(SERCA)发生物理相互作用。 SERCA是内质网(ER)钙泵,仅负责将胞质钙转运到ER腔中。与dSeipin一样,dSERCA细胞会自动促进果蝇脂肪细胞中的脂质存储。 dSeipin影响dSERCA活性并调节细胞内钙稳态。 ER到胞质钙释放通道ryanodine受体(RyR)的脂肪组织特异性敲低可部分恢复dSeipin突变体中的脂肪储存。我们的结果表明,Seipin通过调节细胞内钙稳态来促进脂肪组织脂肪的储存。

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