HPS6 Regulates the Biogenesis of Weibel-Palade Body in Endothelial Cells Through Trafficking v-ATPase to Its Limiting Membrane.

HPS6 Regulates the Biogenesis of Weibel-Palade Body in Endothelial Cells Through Trafficking v-ATPase to Its Limiting Membrane.
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HPS6 通过将 v-ATP 酶转运至其限制膜来调节内皮细胞中 Weibel-Palade 小体的生物合成

DOI:
10.3389/fcell.2021.743124
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发表时间:
2021
影响因子:
5.5
通讯作者:
Li W
Li W
中科院分区:
生物学2区
文献类型:
--
作者:
Lu J;Ma J;Hao Z;Li W

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Webel-Palade小体(WPB)是内皮细胞中溶酶体相关细胞器(LRO)之一,其主要成分为von Willebrand因子(VWF)。LROS的生物发生受Hermansky-Pudlak综合征(HPS)蛋白相关复合体的调控,该复合体通过将货物蛋白转运到WPBs中。我们以前的研究表明,BLOC-2复合体的一个亚单位HPS6可能参与了WPBs的成熟。然而,其潜在的机制仍不清楚。在本研究中,我们发现HPS6基因敲除人脐静脉内皮细胞(HUVECs)会导致WPBs畸形,WPB数量减少,vWF管形成障碍,这与HPS6基因缺陷的小鼠内皮细胞的特征相似。我们观察到v-ATPase的一个亚单位ATP6V0D1被敲除后,HUVEC中WPBs的形态发生了相似的变化。此外,我们还发现HPS6与ATP6V0D1相互作用,提示HPS6将ATP6V0D1转运到WPB限制膜上,以组装v-ATPase复合体,以保持其酸性管腔pH,这对WPB成熟过程中vWF小管的形成至关重要。综上所述,HPS6可能通过参与v-ATPase向WPB膜的转运来调控WPB的生物发生。
The Weibel–Palade body (WPB) is one of the lysosome-related organelles (LROs) in endothelial cells, whose main content is von Willebrand factor (vWF). The biogenesis of LROs is regulated by the Hermansky–Pudlak syndrome (HPS) protein-associated complexes through transporting cargo proteins to WPBs. Our previous studies have shown that HPS6, a subunit of BLOC-2 complex, is likely involved in the maturation of WPBs. However, the underlying mechanism remains unknown. In this study, we found that the knockdown of HPS6 in human umbilical vein endothelial cells (HUVECs) resulted in misshaped WPBs, decreased WPB number, and impaired vWF tubulation, which are similar to the characteristics of HPS6-deficient mouse endothelial cells. We observed similar morphological changes of WPBs in HUVECs after the knockdown of ATP6V0D1 (a subunit of v-ATPase). Furthermore, we found that HPS6 interacted with ATP6V0D1, suggesting that HPS6 transports ATP6V0D1 to the WPB limiting membrane for the assembly of the v-ATPase complex to maintain its acidic luminal pH, which is critical for the formation of vWF tubules during WPB maturation. In conclusion, HPS6 likely regulates the biogenesis of WPBs by participating in the trafficking of v-ATPase to the WPB membrane.
BLOC-2 亚基 HPS6 缺陷影响小鼠内皮细胞的管状和冯维勒布兰德因子的分泌
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