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The differential adhesion hypothesis: a direct evaluation.

Ramsey A Foty1, Malcolm S Steinberg

  • 1Department of Surgery, UMDNJ-Robert Wood Johnson Medical School, New Brunswick, NJ 08903, USA.

Developmental Biology
|January 15, 2005
PubMed
Summary
This summary is machine-generated.

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The differential adhesion hypothesis explains tissue development through cell surface tension. This study shows cell surface tension directly correlates with cadherin expression, supporting self-assembly in morphogenetic processes.

Area of Science:

  • Developmental biology
  • Cell biology
  • Biophysics

Background:

  • The differential adhesion hypothesis (DAH) proposes that differences in cell adhesion drive tissue spreading and cell segregation during development.
  • Previous studies demonstrated that lower surface tension cell aggregates envelop higher surface tension aggregates.

Purpose of the Study:

  • To investigate the relationship between cadherin expression levels and the surface tension of cell aggregates.
  • To test whether cadherin expression quantitatively influences cell surface tension in a predictable manner.

Main Methods:

  • L cells were transfected to express varying amounts of N-, P-, or E-cadherin.
  • Surface tensions of these engineered cell aggregates were measured.
  • The relationship between cadherin expression level and aggregate surface tension was analyzed.

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Main Results:

  • Aggregate surface tension was found to be a direct, linear function of cadherin expression level.
  • This relationship held true across different cadherin types (N-, P-, E-cadherin).
  • Cadherins were confirmed as the primary determinants of surface tension in these experimental systems.

Conclusions:

  • Cellular morphogenetic rearrangements, such as cell sorting and tissue spreading, are self-assembly processes driven by the reduction of adhesive free energy.
  • Cells maximize mutual binding, leading to predictable tissue organization based on adhesive properties.
  • The physics of cell adhesion, specifically cadherin-mediated interactions, quantitatively govern these developmental self-assembly processes.