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Related Experiment Videos

Intercellular adhesion molecule-1 dimerization and its consequences for adhesion mediated by lymphocyte function

J Miller1, R Knorr, M Ferrone

  • 1Center for Immunology, Washington University School of Medicine, St. Louis, Missouri, USA.

The Journal of Experimental Medicine
|November 1, 1995
PubMed
Summary
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Intercellular adhesion molecule-1 (ICAM-1) forms dimers, enhancing its binding to LFA-1. This homodimerization is crucial for ICAM-1

Area of Science:

  • Immunology
  • Cell Biology
  • Biochemistry

Background:

  • Intercellular adhesion molecule-1 (ICAM-1, CD54) is a key immune cell adhesion molecule.
  • ICAM-1 functions as a ligand for integrins like LFA-1 and Mac-1, mediating immune and inflammatory responses.

Purpose of the Study:

  • To investigate the homodimerization of ICAM-1.
  • To determine the functional significance of ICAM-1 homodimerization in ligand binding and cell adhesion.

Main Methods:

  • Expression and modification of recombinant soluble ICAM-1.
  • Binding assays using purified LFA-1.
  • Monoclonal antibody binding studies on cell surface ICAM-1 mutants.
  • Chemical cross-linking of cell surface ICAM-1.

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Main Results:

  • Modified soluble ICAM-1 forms dimers, indicating homophilic interaction sites in its ectodomain.
  • Soluble ICAM-1 dimers exhibit high-avidity binding to LFA-1 (Kd = 8 nM), unlike monomers.
  • Cell surface ICAM-1 exists as dimers, confirmed by antibody binding and cross-linking experiments.
  • Dimeric cell surface ICAM-1 demonstrates enhanced potency as an LFA-1 ligand compared to monomers.

Conclusions:

  • ICAM-1 undergoes functionally significant homodimerization.
  • ICAM-1 dimers serve as more potent ligands for LFA-1-mediated adhesion.
  • This study provides the first evidence of specific, functionally important homodimerization for a cell surface integrin ligand.