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The Journal of Immunology, Vol 151, Issue 3 1528-1534, Copyright © 1993 by American Association of Immunologists

ARTICLES

Targeted disruption of CD43 gene enhances T lymphocyte adhesion

N Manjunath, RS Johnson, DE Staunton, R Pasqualini and B Ardman
Department of Medicine, New England Medical Center Hospitals, Boston, Massachusetts 02111.

CD43 is a major leukocyte surface glycoprotein thought to have important functions for T lymphocyte adhesion and activation. We investigated the function of CD43 by using gene targeting to eliminate CD43 expression in the human T lymphocyte line CEM and then testing their adhesive phenotype. Loss of CD43 expression by the CEM cells enhanced their homotypic adhesion and binding to two distinct ligands, fibronectin and HIV-1 gp120. The enhanced homotypic adhesion was blocked specifically by an anti-beta 1 integrin mAb, and the enhanced binding to fibronectin and gp120 was blocked specifically by anti-beta 1 integrin and anti-CD4 mAb, respectively. Partial reconstitution of CD43 expression in the CD43-negative cells resulted in a corresponding reversion to a less adhesive phenotype. These data suggest that CD43 interferes with T lymphocyte adhesion and that CD43 can regulate lymphocyte adhesion by providing a threshold that must be overcome for cell-cell and cell-ligand interactions to occur.


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