A Rab10-dependent mechanism for polarized basement membrane secretion during organ morphogenesis.

A Rab10-dependent mechanism for polarized basement membrane secretion during organ morphogenesis.
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DOI:
10.1016/j.devcel.2012.12.005
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发表时间:
2013-01-28
期刊:
影响因子:
11.8
通讯作者:
Horne-Badovinac, Sally
Horne-Badovinac, Sally
中科院分区:
生物学1区
文献类型:
--
作者:
Lerner, David W.;McCoy, Darcy;Isabella, Adam J.;Mahowald, Anthony P.;Gerlach, Gary F.;Chaudhry, Thymur A.;Horne-Badovinac, Sally

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基底膜(BM)是上皮结构和形态发生所必需的特化细胞外基质。然而,关于BM蛋白如何被递送到基底细胞表面,或者这个过程在发育过程中如何被调节,我们知之甚少。在这里,我们确定了一种机制,在果蝇卵泡细胞的BM分泌极化。BM蛋白在基底ER隔室中从局部mRNA合成,然后通过Tango1阳性ER出口位点输出到基底高尔基体簇。接下来,Crag将Rab10靶向基底细胞质中的结构,在那里它限制蛋白质递送到基底表面。这些事件发生在卵室延长,形态发生过程,取决于卵泡细胞平面极性和BM重塑。值得注意的是,Tango1和Rab10在基底上皮表面也是平面极化的。我们认为,空间控制BM生产沿着两个组织轴促进外排效率,BM重塑和器官形态发生。
Basement membranes (BM) are specialized extracellular matrices that are essential for epithelial structure and morphogenesis. However, little is known about how BM proteins are delivered to the basal cell surface, or how this process is regulated during development. Here, we identify a mechanism for polarized BM secretion in the Drosophila follicle cells. BM proteins are synthesized in a basal ER compartment from localized mRNAs, and are then exported through Tango1-positive ER exit sites to basal Golgi clusters. Next, Crag targets Rab10 to structures in the basal cytoplasm where it restricts protein delivery to the basal surface. These events occur during egg chamber elongation, a morphogenetic process that depends on follicle cell planar polarity and BM remodeling. Significantly, Tango1 and Rab10 are also planar polarized at the basal epithelial surface. We propose that the spatial control of BM production along two tissue axes promotes exocytic efficiency, BM remodeling and organ morphogenesis.
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