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Title: Cdc42 antagonizes Rho1 activity at adherens junctions to limit epithelial cell apical tension

Abstract

In epithelia, cells are arranged in an orderly pattern with a defined orientation and shape. Cadherin containing apical adherens junctions (AJs) and the associated actomyosin cytoskeleton likely contribute to epithelial cell shape by providing apical tension. The Rho guanosine triphosphatases are well known regulators of cell junction formation, maintenance, and function. Specifically, Rho promotes actomyosin activity and cell contractility; however, what controls and localizes this Rho activity as epithelia remodel is unresolved. Using mosaic clonal analysis in the Drosophila melanogaster pupal eye, we find that Cdc42 is critical for limiting apical cell tension by antagonizing Rho activity at AJs. Cdc42 localizes Par6–atypical protein kinase C (aPKC) to AJs, where this complex limits Rho1 activity and thus actomyosin contractility, independent of its effects on Wiskott-Aldrich syndrome protein and p21-activated kinase. Thus, in addition to its role in the establishment and maintenance of apical–basal polarity in forming epithelia, the Cdc42–Par6–aPKC polarity complex is required to limit Rho activity at AJs and thus modulate apical tension so as to shape the final epithelium.

Authors:
 [1];  [1]
  1. Washington Univ., St. Louis, MO (United States). Dept. of Medicine; Washington Univ., St. Louis, MO (United States). Dept. of Medicine and Department of Cell Biology and Physiology
Publication Date:
Research Org.:
Washington Univ., St. Louis, MO (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Biological and Environmental Research (BER). Biological Systems Science Division; National Institutes of Health (NIH)
OSTI Identifier:
1625155
Grant/Contract Number:  
CA85839; GM080673
Resource Type:
Accepted Manuscript
Journal Name:
Journal of Cell Biology
Additional Journal Information:
Journal Volume: 187; Journal Issue: 1; Journal ID: ISSN 0021-9525
Publisher:
Rockefeller University Press
Country of Publication:
United States
Language:
English
Subject:
59 BASIC BIOLOGICAL SCIENCES; Cell Biology

Citation Formats

Warner, Stephen J., and Longmore, Gregory D. Cdc42 antagonizes Rho1 activity at adherens junctions to limit epithelial cell apical tension. United States: N. p., 2009. Web. doi:10.1083/jcb.200906047.
Warner, Stephen J., & Longmore, Gregory D. Cdc42 antagonizes Rho1 activity at adherens junctions to limit epithelial cell apical tension. United States. https://doi.org/10.1083/jcb.200906047
Warner, Stephen J., and Longmore, Gregory D. Mon . "Cdc42 antagonizes Rho1 activity at adherens junctions to limit epithelial cell apical tension". United States. https://doi.org/10.1083/jcb.200906047. https://www.osti.gov/servlets/purl/1625155.
@article{osti_1625155,
title = {Cdc42 antagonizes Rho1 activity at adherens junctions to limit epithelial cell apical tension},
author = {Warner, Stephen J. and Longmore, Gregory D.},
abstractNote = {In epithelia, cells are arranged in an orderly pattern with a defined orientation and shape. Cadherin containing apical adherens junctions (AJs) and the associated actomyosin cytoskeleton likely contribute to epithelial cell shape by providing apical tension. The Rho guanosine triphosphatases are well known regulators of cell junction formation, maintenance, and function. Specifically, Rho promotes actomyosin activity and cell contractility; however, what controls and localizes this Rho activity as epithelia remodel is unresolved. Using mosaic clonal analysis in the Drosophila melanogaster pupal eye, we find that Cdc42 is critical for limiting apical cell tension by antagonizing Rho activity at AJs. Cdc42 localizes Par6–atypical protein kinase C (aPKC) to AJs, where this complex limits Rho1 activity and thus actomyosin contractility, independent of its effects on Wiskott-Aldrich syndrome protein and p21-activated kinase. Thus, in addition to its role in the establishment and maintenance of apical–basal polarity in forming epithelia, the Cdc42–Par6–aPKC polarity complex is required to limit Rho activity at AJs and thus modulate apical tension so as to shape the final epithelium.},
doi = {10.1083/jcb.200906047},
journal = {Journal of Cell Biology},
number = 1,
volume = 187,
place = {United States},
year = {Mon Oct 05 00:00:00 EDT 2009},
month = {Mon Oct 05 00:00:00 EDT 2009}
}

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