DRhoGEF2 regulates actin organization and contractility in the Drosophila blastoderm embryo

被引:69
作者
Barmchi, MP
Rogers, S
Häcker, U
机构
[1] Lund Univ, Dept Cell & Mol Biol, Lund Strateg Res Ctr Stern Cell Biol & Cell Thera, S-22184 Lund, Sweden
[2] Univ Calif San Francisco, Howard Hughes Med Inst, San Francisco, CA 94143 USA
[3] Univ Calif San Francisco, Dept Cellular & Mol Pharmacol, San Francisco, CA 94143 USA
关键词
D O I
10.1083/jcb.200407124
中图分类号
Q2 [细胞生物学];
学科分类号
071009 ; 090102 ;
摘要
Morphogenesis of the Drosophila melanogaster embryo is associated with a dynamic reorganization of the actin cytoskeleton that is mediated by small GTPases of the Rho family. Often, Rho1 controls different aspects of cytoskeletal function in parallel, requiring a complex level of regulation. We show that the guanine triphosphate (GTP) exchange factor DRhoGEF2 is apically localized in epithelial cells throughout embryogenesis. We demonstrate that DRhoGEF2, which has previously been shown to regulate cell shape changes during gastrulation, recruits Rho1 to actin rings and regulates actin distribution and actomyosin contractility during nuclear divisions, pole cell formation, and cellularization of syncytial blastoderm embryos. We propose that DRhoGEF2 activity coordinates contractile actomyosin forces throughout morphogenesis in Drosophila by regulating the association of myosin with actin to form contractile cables. Our results support the hypothesis that specific aspects of Rho1 function are regulated by specific GTP exchange factors.
引用
收藏
页码:575 / 585
页数:11
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