Sar1 Affects the Localization of Perilipin 2 to Lipid Droplets

Sar1 Affects the Localization of Perilipin 2 to Lipid Droplets
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Sar1影响Perilipin 2在脂滴中的定位

DOI:
10.3390/ijms23126366
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发表时间:
2022-06-07
影响因子:
5.6
通讯作者:
Itabe, Hiroyuki
Itabe, Hiroyuki
中科院分区:
生物学2区
文献类型:
--
作者:
Makiyama, Tomohiko;Obama, Takashi;Watanabe, Yuichi;Itabe, Hiroyuki

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脂滴(LD)是细胞内细胞器,在许多类型的细胞中普遍存在。 LD 核心由三酰甘油 (TG) 组成,周围有磷脂单层和表面蛋白,例如周脂蛋白 2 (PLIN2)。尽管 TG 在内质网 (ER) 的磷脂双层中积累,随后新生的 LD 会从 ER 中出芽,但 LD 蛋白转运到 LD 颗粒的机制尚不完全清楚。 Sar1 是一种 GTP 酶,被称为外壳蛋白复合物 Ⅱ (COPⅡ) 囊泡出芽的调节因子,本研究探讨了其在 LD 形成中的作用。 HuH7 人肝癌细胞被含有编码与野生型 Sar1 (Sar1 WT) 或 GTPase 突变形式 (Sar1 H79G) 融合的 GFP 基因的腺病毒颗粒感染。当 HuH7 细胞用油酸处理时,Sar1 WT 在 LD 周围形成环状结构。 Sar1 的瞬时表达并没有显着改变细胞中 TG 和 PLIN2 的水平。然而,在表达 Sar1 H79G 的细胞中,PLIN2 对 LD 的定位减少。此外,通过使用短发夹 RNA 技术抑制内源性 Sar1,验证了 Sar1 对 PLIN2 定位到 LD 的影响。总之,发现Sar1在肝细胞内PLIN2向LDs的细胞内分布中具有一定的作用。
Lipid droplets (LDs) are intracellular organelles that are ubiquitous in many types of cells. The LD core consists of triacylglycerols (TGs) surrounded by a phospholipid monolayer and surface proteins such as perilipin 2 (PLIN2). Although TGs accumulate in the phospholipid bilayer of the endoplasmic reticulum (ER) and subsequently nascent LDs buds from ER, the mechanism by which LD proteins are transported to LD particles is not fully understood. Sar1 is a GTPase known as a regulator of coat protein complex Ⅱ (COPⅡ) vesicle budding, and its role in LD formation was investigated in this study. HuH7 human hepatoma cells were infected with adenoviral particles containing genes coding GFP fused with wild-type Sar1 (Sar1 WT) or a GTPase mutant form (Sar1 H79G). When HuH7 cells were treated with oleic acid, Sar1 WT formed a ring-like structure around the LDs. The transient expression of Sar1 did not significantly alter the levels of TG and PLIN2 in the cells. However, the localization of PLIN2 to the LDs decreased in the cells expressing Sar1 H79G. Furthermore, the effects of Sar1 on PLIN2 localization to the LDs were verified by the suppression of endogenous Sar1 using the short hairpin RNA technique. In conclusion, it was found that Sar1 has some roles in the intracellular distribution of PLIN2 to LDs in liver cells.
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