Department of Medicine IV, Medical Center - University of Freiburg, Faculty of Medicine, University of Freiburg, Freiburg, Germany.
Department of Medicine, Shiga University of Medical Science, Otsu, Shiga, Japan.
Sci Rep. 2017 Nov 21;7(1):15910. doi: 10.1038/s41598-017-15844-1.
Podocytes are highly specialized epithelial cells essentially required to establish and maintain the kidney filtration barrier. Due to their complex cellular architecture these cells rely on an elaborated cytoskeletal apparatus providing plasticity as well as adaptive adhesion properties to withstand significant physical filtration forces. However, our knowledge about podocyte specific components of the cytoskeletal machinery is still incomplete. Employing cross-analysis of various quantitative omics-data sets we identify the WD40-domain containing protein CORO2B as a podocyte enriched protein. Furthermore, we demonstrate the distinct localization pattern of CORO2B to the ventral actin cytoskeleton serving as a physical linkage module to cell-matrix adhesion sites. Analysis of a novel Coro2b knockout mouse revealed that CORO2B modulates stress response of podocytes in an experimental nephropathy model. Using quantitative focal adhesome proteomics we identify the recruitment of CFL1 via CORO2B to focal adhesions as an underlying mechanism. Thus, we describe CORO2B as a novel podocyte enriched protein influencing cytoskeletal plasticity and stress adaptation.
足细胞是高度特化的上皮细胞,对于建立和维持肾脏滤过屏障至关重要。由于其复杂的细胞结构,这些细胞依赖于精细的细胞骨架装置,提供可塑性以及适应性粘附特性,以承受显著的物理滤过力。然而,我们对足细胞细胞骨架机制的特定成分的了解仍然不完整。通过对各种定量组学数据集的交叉分析,我们确定 WD40 结构域包含蛋白 CORO2B 是一种富含足细胞的蛋白。此外,我们证明了 CORO2B 独特的定位模式到腹侧肌动蛋白细胞骨架,作为细胞-基质粘附位点的物理连接模块。对新型 Coro2b 敲除小鼠的分析表明,CORO2B 在实验性肾病模型中调节足细胞的应激反应。通过定量焦点黏附斑蛋白质组学分析,我们发现 CORO2B 通过募集 CFL1 到焦点黏附斑作为潜在的机制。因此,我们将 CORO2B 描述为一种新型的富含足细胞的蛋白,影响细胞骨架的可塑性和应激适应。