The ER-associated degradation adaptor protein Sel1L regulates LPL secretion and lipid metabolism.

The ER-associated degradation adaptor protein Sel1L regulates LPL secretion and lipid metabolism.
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ER 相关降解接头蛋白 Sel1L 调节 LPL 分泌和脂质代谢。

DOI:
10.1016/j.cmet.2014.06.015
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发表时间:
2014-09-02
期刊:
影响因子:
29
通讯作者:
Qi L
Qi L
中科院分区:
生物学1区
文献类型:
--
作者:
Sha H;Sun S;Francisco AB;Ehrhardt N;Xue Z;Liu L;Lawrence P;Mattijssen F;Guber RD;Panhwar MS;Brenna JT;Shi H;Xue B;Kersten S;Bensadoun A;Péterfy M;Long Q;Qi L

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Sel 1 L是内质网相关降解(ERAD)中E3连接酶Hrd 1的必需衔接蛋白,ERAD是细胞中的通用质量控制系统;但其生理作用尚不清楚。在这里,我们表明,小鼠脂肪细胞特异性Sel 1 L缺乏是抵抗饮食诱导的肥胖症,并表现出餐后高血脂症。进一步的分析表明,Sel 1 L是必不可少的脂蛋白脂肪酶(LPL)的分泌,独立于其在Hrd 1介导的ERAD和ER稳态的作用。Sel 1 L与LPL成熟复合物相互作用并稳定LPL成熟复合物,该复合物由LPL和脂肪酶成熟因子1(LMF 1)组成。在缺乏Sel 1 L的情况下,LPL保留在ER中并形成蛋白质聚集体,其主要通过自噬降解。Sel 1 L介导的LPL分泌控制也见于其他表达LPL的细胞类型,包括心肌细胞和巨噬细胞。因此,我们的研究报告Sel 1 L在LPL分泌和全身脂质代谢中的作用。
Sel1L is an essential adaptor protein for the E3 ligase Hrd1 in the endoplasmic reticulum-associated degradation (ERAD), a universal quality-control system in the cell; but its physiological role remains unclear. Here we show that mice with adipocyte-specific Sel1L deficiency are resistant to diet-induced obesity and exhibit postprandial hypertriglyceridemia. Further analyses reveal that Sel1L is indispensable for the secretion of lipoprotein lipase (LPL), independently of its role in Hrd1-mediated ERAD and ER homeostasis. Sel1L physically interacts and stabilizes the LPL maturation complex consisted of LPL and lipase-maturation factor 1 (LMF1). In the absence of Sel1L, LPL is retained in the ER and form protein aggregates, which are degraded primarily by autophagy. The Sel1L-mediated control of LPL secretion is also seen in other LPL-expressing cell types including cardiac myocytes and macrophages. Thus, our study reports a role of Sel1L in LPL secretion and systemic lipid metabolism.
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