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Related Experiment Videos

E-cadherin is a ligand for integrin alpha2beta1.

John D Whittard1, Susan E Craig, A Paul Mould

  • 1Wellcome Trust Centre for Cell-Matrix Research, School of Biological Sciences, University of Manchester, 2.205 Stopford Building, Oxford Road, Manchester M13 9PT, UK.

Matrix Biology : Journal of the International Society for Matrix Biology
|October 24, 2002
PubMed
Summary

E-cadherin mediates cell adhesion. This study reveals E-cadherin interacts with the alpha2beta1 integrin, suggesting broader roles in cell communication beyond epithelial tissues.

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Area of Science:

  • Cell Biology
  • Molecular Biology
  • Biochemistry

Background:

  • E-cadherin is a key transmembrane glycoprotein in epithelial cell-cell adhesion.
  • E-cadherin's known function is homotypic adhesion, but it also interacts with leukocyte integrins.
  • The potential for E-cadherin to engage in heterotypic interactions with other integrins is not fully understood.

Purpose of the Study:

  • To investigate E-cadherin's potential interactions with integrins on non-leukocytic cells.
  • To explore E-cadherin's role in heterotypic cell adhesion.
  • To characterize the specific integrin subunit(s) involved in E-cadherin-mediated adhesion.

Main Methods:

  • Utilized cell adhesion assays with HT1080 fibrosarcoma cells and a pentameric E-cadherin construct.

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  • Employed solid-phase receptor-ligand binding experiments with purified and recombinant integrin components.
  • Used anti-functional monoclonal antibodies targeting specific integrin subunits to block adhesion.

    • Main Results:

    • HT1080 cells demonstrated specific adhesion to pentameric E-cadherin.
    • Adhesion was inhibited by antibodies against integrin alpha2 and beta1 subunits, identifying alpha2beta1 as the receptor.
    • Pentameric E-cadherin bound to purified alpha2beta1 and its A-domain in a divalent cation-dependent manner.

    Conclusions:

    • E-cadherin directly interacts with the alpha2beta1 integrin.
    • This interaction suggests E-cadherin participates in heterotypic adhesion with non-leukocytic cells.
    • E-cadherin's involvement in integrin-mediated heterotypic interactions may be more widespread than previously recognized.