Signaling by lymphocyte function-associated antigen 1 (LFA-1) in B cells: Enhanced antigen presentation after stimulation through LFA-1

Vincent T. Moy, Adrienne A. Brian

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To examine the role of lymphocyte function-associated antigen 1 (LFA-1) expression on murine B cells as it pertains to their function in T cell activation, we carried out antigen-presentation assays in tissue culture wells coated with a purified, secreted form of the murine intercellular adhesion molecule 1 (ICAM-1). We observed a significant decrease in the concentration of antigen required to activate a T cell hybridoma and primary T cells in wells coated with ICAM-1. This effect was dependent on the amount of ICAM-1 used to coat the wells and was also observed in wells coated with anti-LFA-1-monoclonal antibodies and was blocked by soluble anti-LFA-1 antibodies. The effect on antigen dose was most pronounced in assays carried out with an ICAM-1-deficient mutant B lymphoma cell line, small resting primary B cells, and unfractionated primary B cells at low concentrations. No decrease in the antigen dose was observed if the B cells were chemically fixed or treated with ricin, or when antigen was presented by a HeLa cell line transfected with murine class II major histocompatibility complex (MHC) genes, indicating that the immobilized ICAM-1 was mediating its effect through B cell LFA-1, and that B cell protein synthesis was required. The enhancing effect was also observed if the B cells were prepulsed with antigen, indicating that improved uptake or processing of antigen, or increased class II MHC expression were unlikely mechanisms.

Original languageEnglish (US)
Pages (from-to)1-7
Number of pages7
JournalJournal of Experimental Medicine
Issue number1
StatePublished - Jan 1 1992
Externally publishedYes


ASJC Scopus subject areas

  • Immunology and Allergy
  • Immunology

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