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Integrins of the beta1 family influence keratinocyte-lymphocyte interaction

M Boukhelifa1, Y Paulin, J Font

  • 1Laboratoire de Glycobiologie et Reconnaissance Cellulaire, Université René-Descartes Paris V, France.

The Journal of Investigative Dermatology
|October 9, 1998
PubMed

Insights

Beta1 integrins, specifically alpha2 and alpha3 subunits, are key in keratinocyte-lymphocyte adhesion. Optimal adhesion occurs with activated cells, involving ICAM-1 and lymphocyte function-associated-1 molecules.

Area of Science:

  • Immunology
  • Cell Biology
  • Dermatology

Background:

  • Intercellular Adhesion Molecule-1 (ICAM-1) is crucial for keratinocyte-lymphocyte interactions.
  • Beta1 integrins are involved in cell-cell adhesion processes.

Purpose of the Study:

  • To investigate the role of beta1 integrins in keratinocyte-lymphocyte adhesion under various activation conditions.
  • To identify specific beta1 integrin subunits involved in this adhesion process.

Main Methods:

  • Indirect immunofluorescence microscopy and flow cytometry were used to detect beta1 integrin subunits on keratinocytes and lymphocytes.
  • Cell adhesion assays were performed under different activation conditions using cytokines like IFN-gamma and phorbol 12-myristate 13-acetate.

Main Results:

  • Alpha2 and alpha3 beta1 integrin subunits on both keratinocytes and lymphocytes were primarily involved in adhesion.
  • Maximal adhesion was observed when keratinocytes were activated by IFN-gamma and lymphocytes by phorbol 12-myristate 13-acetate.
  • Keratinocyte activation, marked by ICAM-1 expression and reduced beta1 integrins, was essential for optimal lymphocyte adhesion.

Conclusions:

  • Beta1 integrins, particularly alpha2 and alpha3, play a significant role in keratinocyte-lymphocyte adhesion.
  • IFN-gamma can activate beta1 integrins on keratinocytes, which then synergize with ICAM-1 and LFA-1 for enhanced adhesion.

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