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Activation of the planar cell polarity formin DAAM1 leads to inhibition of endothelial cell proliferation, migration, and angiogenesis.

ABSTRACT: The Wnt/planar cell polarity (PCP) pathway regulates directed cell movement during development and was recently found to play a critical role in endothelial cell proliferation and angiogenesis [Zhang Y, et al. (2006) Chem Biol 13:1001-1009; Masckauchan TN, et al. (2006) Mol Biol Cell 17:5163-5172]. However, the mechanisms by which PCP signaling components regulate angiogenesis remain unknown. We report that expression of a constitutively active C-terminal domain of Dishevelled-associated activator of morphogenesis 1 (DAAM1) selectively inhibited endothelial cell proliferation. Moreover, this activated construct suppressed endothelial cell migration and the ability to form coordinated networks in vivo and in vitro. Although constitutively active DAAM1 (CDAAM1) induced both actin polymerization and microtubule (MT) stabilization, the stabilization of MTs alone was sufficient to inhibit endothelial cell growth selectively. Inhibition of actin polymerization alone by jasplakinolide treatment failed to reproduce the inhibitory effects of CDAAM1. These results indicate that DAAM1 regulates endothelial cell growth through MT stabilization in a cell type-selective manner and suggest that PCP signaling plays a pivotal role in angiogenesis by regulating MT stabilization.

SUBMITTER: Ju R

PROVIDER: S-EPMC2872452 | biostudies-literature | 2010 Apr

REPOSITORIES: biostudies-literature

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Activation of the planar cell polarity formin DAAM1 leads to inhibition of endothelial cell proliferation, migration, and angiogenesis.

Ju Rong R Cirone Pasquale P Lin Shengda S Griesbach Hilary H Slusarski Diane C DC Crews Craig M CM

Proceedings of the National Academy of Sciences of the United States of America 20100329 15

The Wnt/planar cell polarity (PCP) pathway regulates directed cell movement during development and was recently found to play a critical role in endothelial cell proliferation and angiogenesis [Zhang Y, et al. (2006) Chem Biol 13:1001-1009; Masckauchan TN, et al. (2006) Mol Biol Cell 17:5163-5172]. However, the mechanisms by which PCP signaling components regulate angiogenesis remain unknown. We report that expression of a constitutively active C-terminal domain of Dishevelled-associated activat ...[more]

PMID: 20351293

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Project description:BackgroundDisheveled-associated activator of morphogenesis 1 (DAAM1) is a formin acting downstream of Wnt signaling that is important for planar cell polarity. It has been shown to promote proper cell polarization during embryonic development in both Xenopus and Drosophila. Importantly, DAAM1 binds to Disheveled (Dvl) and thus functions downstream of the Frizzled receptors. Little is known of how DAAM1 is localized and functions in mammalian cells. We investigate here how DAAM1 affects migration and polarization of cultured cells and conclude that it plays a key role in centrosome polarity.Methodology/principal findingsUsing a specific antibody to DAAM1, we find that the protein localizes to the acto-myosin system and co-localizes with ventral myosin IIB-containing actin stress fibers. These fibers are particularly evident in the sub-nuclear region. An N-terminal region of DAAM1 is responsible for this targeting and the DAAM1(1-440) protein can interact with myosin IIB fibers independently of either F-actin or RhoA binding. We also demonstrate that DAAM1 depletion inhibits Golgi reorientation in wound healing assays. Wound-edge cells exhibit multiple protrusions characteristic of unpolarized cell migration. Finally, in U2OS cells lines stably expressing DAAM1, we observe an enhanced myosin IIB stress fiber network which opposes cell migration.Conclusions/significanceThis work highlights the importance of DAAM1 in processes underlying cell polarity and suggests that it acts in part by affecting the function of acto-myosin IIB system. It also emphasizes the importance of the N-terminal half of DAAM1. DAAM1 depletion strongly blocks centrosomal re-polarization, supporting the concept that DAAM1 signaling cooperates with the established Cdc42 associated polarity complex. These findings are also consistent with the observation that ablation of myosin IIB but not myosin IIA results in polarity defects downstream of Wnt signaling. The structure-function analysis of DAAM1 in cultured cells parallels more complex morphological events in the developing embryo.

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Activation of the planar cell polarity formin DAAM1 leads to inhibition of endothelial cell proliferation, migration, and angiogenesis.

Publications

Activation of the planar cell polarity formin DAAM1 leads to inhibition of endothelial cell proliferation, migration, and angiogenesis.

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