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The Journal of Immunology, Vol 147, Issue 9 2852-2859, Copyright © 1991 by American Association of Immunologists

ARTICLES

The role of LFA-1/ICAM-1 interactions during murine T lymphocyte development

JS Fine and AM Kruisbeek
Biological Response Modifiers Program, National Cancer Institute, National Institutes of Health, Bethesda, MD 20892.

We have examined the expression and function of the cell adhesion molecules LFA-1 (CD11a/CD18), ICAM-1 (CD54), and ICAM-2 in murine fetal thymic ontogeny and in the adult thymus. On fetal days 14 and 15, 40 to 50% of thymocytes coexpress high levels of LFA-1 and ICAM-1, as determined by flow cytometry. By day 16, more than 90% of fetal thymocytes are LFA-1+ ICAM-1hi, and all IL-2R+ cells are located in this population. Although LFA-1 expression remains unchanged thereafter, ICAM-1 expression appears to be differentially regulated in different thymocyte subpopulations, with CD4+8+ cells being ICAM-1lo and CD4-8- thymocytes remaining ICAM-1hi. ICAM-2 surface expression is dull on both fetal and adult thymocytes. Surprisingly, the expression of ICAM-1 is differentially up-regulated on T cells having a mature phenotype in thymus and in peripheral lymphoid organs, with CD8+ T cells bearing the highest amount of surface ICAM-1. Addition of anti- ICAM-1 or anti-LFA-1 antibodies to fetal thymic organ cultures results in the impaired generation of CD4+8+ cells. These results indicate that LFA-1/ICAM-1 interactions facilitate murine thymic development and suggest that cell adhesion molecules mediate important events in T cell differentiation.


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