Abstract
CD43 (sialophorin, leukosialin, leukocyte large sialoglyco-protein), a heavily sialylated molecule found on most leukocytes and platelets, was initially identified as a major glycoprotein of mouse, rat and human T cells1–8. CD43 expression is defective on the T cells of males with the Wiskott–Aldrich syndrome, an X chromosome-linked recessive immunodeficiency disorder9. Affected males are susceptible to opportunistic infections and do not respond to polysaccharide antigens, reflecting defects in cytotoxic and helper T-cell functions. Anti-CD43 monoclonal antibodies have a modest costimulatory effect on T cells, natural killer cells, B cells and monocytes10–14, and one such antibody has been shown to activate T cells directly15. To investigate a possible physiological role for CD43, a complementary DNA encoding the human protein16,17 was introduced into an antigen-responsive murine T-cell hybridoma18. We observed that CD43 enhances the antigen-specific activation of T cells and that the intracellular domain of CD43, which is hyperphosphorylated during T-cell activation19–21, is required for this function. We also found that antigen-presenting cells can bind specifically to immobilized purified CD43 and that the binding can be inhibited by liposomes containing CD43 as well as by anti-CD43 monoclonal antibodies.
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Park, J., Rosenstein, Y., Remold-O'Donnell, E. et al. Enhancement of T-cell activation by the CD43 molecule whose expression is defective in Wiskott–Aldrich syndrome. Nature 350, 706–709 (1991). https://doi.org/10.1038/350706a0
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DOI: https://doi.org/10.1038/350706a0
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