Competition between lymphocyte function-associated antigen 1 (CD11a/CD18) and Mac-1 (CD11b/CD18) for binding to intercellular adhesion molecule-1 (CD54)

M Lub, Y van Kooyk, C G Figdor

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Both human integrin receptors Mac-1 (CD11b/CD18,CR3)and lymphocyte function-associated antigen (LFA)-1 (CD11a/CD18) have been demonstrated to bind human intercellular adhesion molecule-1 (ICAM-1) (CD54). Here we show that LFA-1 and Mac-1 can bind to ICAM-1 in the mouse as well. Interestingly, we observed that binding of murine LFA-1 dominates over Mac-1 for binding to ICAM-1. Using three different murine macrophage cell lines that express distinct levels of LFA-1 and Mac-1 on their cell surface, we could only detect Mac-1-dependent adhesion to ICAM-1 when little or no LFA-1 is expressed on the cell surface. When LFA-1 and Mac-1 are expressed at similar levels, the LFA-1/ICAM-1 interaction dominates over Mac-1/ICAM-1 interaction, indicating that there is a competition of LFA-1 and Mac-1 for ICAM-1 binding.

Original languageEnglish
Pages (from-to)648-55
Number of pages8
JournalJournal of leukocyte biology
Issue number5
Publication statusPublished - May 1996


  • Animals
  • Binding, Competitive
  • Cell Adhesion
  • Cell Line
  • Intercellular Adhesion Molecule-1/isolation & purification
  • Lymphocyte Function-Associated Antigen-1/metabolism
  • Macrophage-1 Antigen/isolation & purification
  • Macrophages/metabolism
  • Mice

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