Seipin: harvesting fat and keeping adipocytes healthy.

Seipin: harvesting fat and keeping adipocytes healthy.
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DOI:
10.1016/j.tcb.2021.06.003
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发表时间:
2021-11
影响因子:
19
通讯作者:
Goodman JM
Goodman JM
中科院分区:
生物学1区
文献类型:
--
作者:
Rao MJ;Goodman JM

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Seipin是细胞质脂滴(LD)组装及其在ER连接处维持的关键蛋白; Seipin的缺失导致全身性脂肪营养不良。seipin如何介导LD动力学和预防脂肪代谢障碍还不清楚。新的证据表明,seipin吸引甘油三酯单体从ER到液滴形成的网站。相比之下,seipin可能不直接参与核LD的组装,并且实际上可能在一定距离处抑制它们的形成。Seipin促进脂肪形成,但脂肪营养不良可能涉及脂肪形成后效应。我们假设其中有一个由异常脂滴引起的失控脂解和脂毒性循环,导致脂肪储存耗尽,脂肪和其他细胞无法茁壮成长。
Seipin is a key protein in assembly of cytoplasmic lipid droplets (LDs) and their maintenance at ER junctions; the absence of seipin results in generalized lipodystrophy. How seipin mediates LD dynamics and prevents lipodystrophy are not well understood. New evidence suggests that seipin attracts triglyceride monomers from the ER to sites of droplet formation. In contrast, seipin may not be directly involved in assembly of nuclear LDs and may actually suppress their formation at a distance. Seipin promotes adipogenesis, but lipodystrophy may involve post-adipogenic effects. We hypothesize that among these are a cycle of runaway lipolysis and lipotoxicity caused by aberrant lipid droplets, resulting in a depletion of fat stores and a failure of adipose and other cells to thrive.
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