Spatially resolved cell polarity proteomics of a human epiblast model.

Spatially resolved cell polarity proteomics of a human epiblast model.
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人培养细胞模型的空间分辨细胞极性蛋白质组学。

DOI:
10.1126/sciadv.abd8407
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发表时间:
2021-04
期刊:
影响因子:
13.6
通讯作者:
Taniguchi K
Taniguchi K
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Wang S;Lin CW;Carleton AE;Cortez CL;Johnson C;Taniguchi LE;Sekulovski N;Townshend RF;Basrur V;Nesvizhskii AI;Zou P;Fu J;Gumucio DL;Duncan MC;Taniguchi K

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基于apex2的空间蛋白质组学鉴定了hpsc -囊肿的细胞极性蛋白质组,hpsc -囊肿是人类外胚层腔形成的3D模型。人类胚胎发育的关键早期步骤包括内细胞群的极化,随后形成一个扩大的管腔,这将成为外胚层腔。最近描述的三维(3D)人多能干细胞源性囊肿(hpsc -囊肿)结构可以复制这些过程。为了深入了解外胚层腔形成的机制,我们研究了3D人hpsc囊肿的根尖和基底外侧膜区域的蛋白质组。基于apex2的近距离生物酰化,随后进行定量质谱分析,揭示了多种先前未注释到特定膜亚域的蛋白质。功能实验证实了囊肿形态发生需要几种顶端富集蛋白。特别是,我们发现AP-1网格蛋白接头复合物在管腔建立过程中扩大顶膜结构域的关键作用。这些发现强调了这种接近标记方法在3D干细胞模型中发现新的上皮形态发生调节因子的强大力量。
APEX2-based spatial proteomics identifies cell polarity proteome of hPSC-cysts, a 3D model of human epiblast cavity formation. Critical early steps in human embryonic development include polarization of the inner cell mass, followed by formation of an expanded lumen that will become the epiblast cavity. Recently described three-dimensional (3D) human pluripotent stem cell–derived cyst (hPSC-cyst) structures can replicate these processes. To gain mechanistic insights into the poorly understood machinery involved in epiblast cavity formation, we interrogated the proteomes of apical and basolateral membrane territories in 3D human hPSC-cysts. APEX2-based proximity bioinylation, followed by quantitative mass spectrometry, revealed a variety of proteins without previous annotation to specific membrane subdomains. Functional experiments validated the requirement for several apically enriched proteins in cyst morphogenesis. In particular, we found a key role for the AP-1 clathrin adaptor complex in expanding the apical membrane domains during lumen establishment. These findings highlight the robust power of this proximity labeling approach for discovering novel regulators of epithelial morphogenesis in 3D stem cell–based models.
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