Hong Hyowon, Kim Jongshin, Kim Joon
Graduate School of Medical Science and Engineering, KAIST, Daejeon 305-701, Republic of Korea.
Graduate School of Medical Science and Engineering, KAIST, Daejeon 305-701, Republic of Korea.
Biochem Biophys Res Commun. 2015 May 22;461(1):180-5. doi: 10.1016/j.bbrc.2015.04.028. Epub 2015 Apr 13.
The actin cytoskeleton has been implicated in the assembly of cilia, but roles of actin-dependent motor proteins in ciliogenesis remain unclear. Myosin heavy chain 10 (MYH10), one of the isoforms of non-muscle myosin II, is known to mediate centrosome reorientation during cell migration. Here we show that MYH10 is required for centriole migration to the apical plasma membrane, which occurs at the onset of ciliogenesis. Knockdown of MYH10 in RPE1 cells caused a reduction in the levels of cortical filamentous actin (F-actin) and its binding protein EZRIN. Moreover, both centriole migration and subsequent cilium assembly were defective in MYH10 depleted cells. We further found that MYH10 influences centrosomal recruitment of IFT88, which is required for the transport of building blocks to the ciliary tip. The role of MYH10 in IFT88 recruitment appears to be indirect in that there is a correlation between centriolar IFT88 levels and centriolar positions along the apical-basal axis during ciliogenesis. Our results indicate that MYH10 contributes to ciliogenesis in RPE1 cells by promoting cortical actin-dependent centriole migration.
肌动蛋白细胞骨架与纤毛的组装有关,但肌动蛋白依赖性运动蛋白在纤毛发生过程中的作用仍不清楚。肌球蛋白重链10(MYH10)是非肌肉肌球蛋白II的亚型之一,已知其在细胞迁移过程中介导中心体重新定向。在此我们表明,MYH10是中心粒向顶质膜迁移所必需的,这种迁移发生在纤毛发生开始时。在RPE1细胞中敲低MYH10会导致皮质丝状肌动蛋白(F-肌动蛋白)及其结合蛋白埃兹蛋白水平降低。此外,在MYH10缺失的细胞中,中心粒迁移和随后的纤毛组装均存在缺陷。我们进一步发现,MYH10影响IFT88向中心体的募集,而IFT88是将构建模块运输到纤毛尖端所必需的。MYH10在IFT88募集中的作用似乎是间接的,因为在纤毛发生过程中,中心粒IFT88水平与沿顶-基轴的中心粒位置之间存在相关性。我们的结果表明,MYH10通过促进皮质肌动蛋白依赖性中心粒迁移,有助于RPE1细胞中的纤毛发生。