Remodeling Epithelial Cell Organization: Transitions Between Front–Rear and Apical–Basal Polarity

  1. W. James Nelson
  1. Departments of Biology and Molecular and Cellular Physiology, Stanford University, Stanford, California 94305
  1. Correspondence: wjnelson{at}stanford.edu

Abstract

Polarized epithelial cells have a distinctive apical–basal axis of polarity for vectorial transport of ions and solutes across the epithelium. In contrast, migratory mesenchymal cells have a front–rear axis of polarity. During development, mesenchymal cells convert to epithelia by coalescing into aggregates that undergo epithelial differentiation. Signaling networks and protein complexes comprising Rho family GTPases, polarity complexes (Crumbs, PAR, and Scribble), and their downstream effectors, including the cytoskeleton and the endocytic and exocytic vesicle trafficking pathways, together regulate the distributions of plasma membrane and cytoskeletal proteins between front–rear and apical–basal polarity. The challenge is to understand how these regulators and effectors are adapted to regulate symmetry breaking processes that generate cell polarities that are specialized for different cellular activities and functions.

Footnotes

  • Editors: Bruce Bowerman and Rong Li

  • Additional Perspectives on Symmetry Breaking in Biology available at www.cshperspectives.org



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