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Related Experiment Videos

(Alpha)3(beta)1 integrin regulates epithelial cytoskeletal organization.

Z Wang1, J M Symons, S L Goldstein

  • 1Department of Medicine, Children's Hospital, Harvard Medical School, Boston, MA 02115, USA.

Journal of Cell Science
|August 13, 1999
PubMed
Summary

Integrins are essential for epithelial cells to form their characteristic sub-cortical cytoskeleton, a function independent of cadherins. This study reveals integrins are critical for cytoskeletal organization and cell junction stability.

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Area of Science:

  • Cell Biology
  • Biochemistry
  • Integrative Biology

Background:

  • Epithelial cell morphology relies on cell-cell and cell-matrix interactions mediated by integrins and cadherins.
  • The specific roles of integrins versus cadherins in maintaining the epithelial sub-cortical cytoskeleton are not well understood.
  • Previous studies using integrin-blocking antibodies obscured distinct contributions due to simultaneous loss of cell adhesion and cytoskeletal organization.

Purpose of the Study:

  • To investigate the distinct roles of integrins and cadherins in epithelial cell morphology and cytoskeletal organization.
  • To elucidate the contribution of alpha3beta1 integrin to the sub-cortical cytoskeleton in kidney collecting duct epithelial cells.
  • To determine the cross-regulatory relationship between integrins and cadherins in establishing epithelial cell structure.

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Main Methods:

  • Utilized alpha3beta1 integrin-deficient mice to isolate and culture kidney collecting duct cells.
  • Established immortalized cell lines from wild-type and alpha3beta1 integrin-deficient kidney collecting ducts.
  • Analyzed cell morphology, cytoskeletal organization (actin stress fibers, sub-cortical cytoskeleton), and cadherin:catenin complex association with alpha-actinin.

Main Results:

  • Alpha3beta1 integrin-deficient cells maintained cadherin-mediated cell-cell adhesions but lacked the sub-cortical cytoskeleton, instead forming actin stress fibers.
  • Cell-cell junctions in mutant cells were irregular, unlike the uniform orientation in wild-type cells.
  • The association of the cadherin:catenin complex with alpha-actinin was significantly reduced in integrin-deficient cells, indicating impaired cytoskeletal linkage.

Conclusions:

  • Integrins play a primary and essential role in establishing and maintaining the epithelial sub-cortical cytoskeleton.
  • Integrin-mediated cytoskeletal assembly is crucial for the subsequent association of the cytoskeleton with the cadherin:catenin complex.
  • Demonstrated direct evidence of integrin:cadherin cross-regulation, where cadherin function is dependent on integrin presence.