Fsp27 promotes lipid droplet growth by lipid exchange and transfer at lipid droplet contact sites.

Fsp27 promotes lipid droplet growth by lipid exchange and transfer at lipid droplet contact sites.
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Fsp27通过脂滴接触位点的脂质交换和转移促进脂滴生长

DOI:
10.1083/jcb.201104142
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发表时间:
2011-12-12
期刊:
The Journal of cell biology
影响因子:
--
通讯作者:
Li P
Li P
中科院分区:
其他
文献类型:
--
作者:
Gong J;Sun Z;Wu L;Xu W;Schieber N;Xu D;Shui G;Yang H;Parton RG;Li P

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脂滴相关蛋白Fsp 27通过促进从较小脂滴到较大脂滴的定向脂质转移来介导脂滴生长。脂滴是一种动态的细胞器,控制着许多生物学过程。然而,决定LD生长的分子组分知之甚少。遗传分析表明,Fsp 27,一种LD相关蛋白,在控制LD大小和脂肪细胞中的脂质储存中是重要的。在本文中,我们证明Fsp 27集中富集在LD-LD接触位点(LDCS)。光漂白揭示了野生型脂肪细胞和Fsp 27过表达细胞中接触LD之间发生脂质交换,但不存在Fsp 27缺陷型脂肪细胞。此外,活细胞成像揭示了独特的Fsp 27介导的LD生长过程,涉及在LDCS处从较小LD到较大LD的定向净脂质转移,这与接触LD对之间的内部压力差的生物物理分析一致。因此,我们发现了一种新的分子机制,LD生长介导的Fsp 27。
The lipid droplet–associated protein Fsp27 mediates lipid droplet growth by promoting directional lipid transfer from smaller to larger lipid droplets. Lipid droplets (LDs) are dynamic cellular organelles that control many biological processes. However, molecular components determining LD growth are poorly understood. Genetic analysis has indicated that Fsp27, an LD-associated protein, is important in controlling LD size and lipid storage in adipocytes. In this paper, we demonstrate that Fsp27 is focally enriched at the LD–LD contacting site (LDCS). Photobleaching revealed the occurrence of lipid exchange between contacted LDs in wild-type adipocytes and Fsp27-overexpressing cells but not Fsp27-deficient adipocytes. Furthermore, live-cell imaging revealed a unique Fsp27-mediated LD growth process involving a directional net lipid transfer from the smaller to larger LDs at LDCSs, which is in accordance with the biophysical analysis of the internal pressure difference between the contacting LD pair. Thus, we have uncovered a novel molecular mechanism of LD growth mediated by Fsp27.
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