Similarities between heterophilic and homophilic cadherin adhesion

A. K. Prakasam, V. Maruthamuthu, D. E. Leckband

Research output: Contribution to journalArticle

Abstract

The mechanism that drives the segregation of cells into tissue-specific subpopulations during development is largely attributed to differences in intercellular adhesion. This process requires the cadherin family of calcium-dependent glycoproteins. A widely held view is that protein-level discrimination between different cadherins on cell surfaces drives this sorting process. Despite this postulated molecular selectivity, adhesion selectivity has not been quantitatively verified at the protein level. In this work, molecular force measurements and bead aggregation assays tested whether differences in cadherin bond strengths could account for cell sorting in vivo and in vitro. Studies were conducted with chicken N-cadherin, canine E-cadherin, and Xenopus C-cadherin. Both qualitative bead aggregation and quantitative force measurements show that the cadherins cross-react. Furthermore, heterophilic adhesion is not substantially weaker than homophilic adhesion, and the measured differences in adhesion do not correlate with cell sorting behavior. These results suggest that the basis for cell segregation during morphogenesis does not map exclusively to protein-level differences in cadherin adhesion.

Original languageEnglish (US)
Pages (from-to)15434-15439
Number of pages6
JournalProceedings of the National Academy of Sciences of the United States of America
Volume103
Issue number42
DOIs
StatePublished - Oct 17 2006

Keywords

  • Cell adhesion
  • Force probe
  • Selectivity
  • Surface forces apparatus

ASJC Scopus subject areas

  • Genetics
  • General

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