BLOC-2 subunit HPS6 deficiency affects the tubulation and secretion of von Willebrand factor from mouse endothelial cells.

BLOC-2 subunit HPS6 deficiency affects the tubulation and secretion of von Willebrand factor from mouse endothelial cells.
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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

DOI:
10.1016/j.jgg.2016.09.007
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发表时间:
2016-12-20
影响因子:
5.9
通讯作者:
Li, Wei
Li, Wei
中科院分区:
生物学2区
文献类型:
--
作者:
Ma, Jing;Zhang, Zhe;Yang, Lin;Kriston-Vizi, Janos;Cutler, Daniel F.;Li, Wei

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Hermansky-Pudlak综合征(HPS)是一种伴有出血性素质的隐性疾病,与血小板颗粒缺陷有关。血小板颗粒和内皮Weibel-Palade小体(WPBs)都是溶酶体相关细胞器(LROs)的成员,其形成受HPS蛋白相关复合物如BLOC(溶酶体相关细胞器复合物的生物发生)-1、-2、-3、AP-3(适应蛋白复合物-3)和HOPS(同型融合和蛋白分选复合物)的调控。血管性血友病因子(VWF)对止血至关重要,它以高度聚合的形式储存在WPBs中的小管中。在本研究中,我们发现HPS1 (block -3亚基)、HPS6 (block -2亚基)和HPS9 (block -1亚基)缺陷小鼠在去氨加压素(DDAVP)刺激后,VWF释放到血浆中存在缺陷,但变化不同。特别是,在HPS6缺陷的WPBs中,VWF成熟的关键步骤VWF管化受到损害。这可能反映了内皮细胞的缺陷,导致HPS小鼠或患者的出血倾向。在这些HPS小鼠模型中,VWF的差异缺陷调节释放表明,在给HPS患者使用DDAVP之前,需要精确的HPS基因分型。
Hermansky-Pudlak syndrome (HPS) is a recessive disorder with bleeding diathesis, which has been linked to platelet granule defects. Both platelet granules and endothelial Weibel-Palade bodies (WPBs) are members of lysosome-related organelles (LROs) whose formation is regulated by HPS protein associated complexes such as BLOC (biogenesis of lysosome-related organelles complex) -1, -2, -3, AP-3 (adaptor protein complex-3) and HOPS (homotypic fusion and protein sorting complex). Von Willebrand factor (VWF) is critical to hemostasis, which is stored in a highly-multimerized form as tubules in the WPBs. In this study, we found the defective, but varying, release of VWF into plasma after desmopressin (DDAVP) stimulation in HPS1 (BLOC-3 subunit), HPS6 (BLOC-2 subunit), and HPS9 (BLOC-1 subunit) deficient mice. In particular, VWF tubulation, a critical step in VWF maturation, was impaired in HPS6 deficient WPBs. This likely reflects a defective endothelium, contributing to the bleeding tendency in HPS mice or patients. The differentially defective regulated release of VWF in these HPS mouse models suggests the need for precise HPS genotyping before DDAVP administration to HPS patients.
基于两层高尔基体的细胞器大小的控制基于内皮细胞的功能可塑性。
DOI: 10.1016/j.devcel.2014.03.021
发表时间: 2014-05-12
期刊: DEVELOPMENTAL CELL
影响因子: 11.8
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