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The Journal of Immunology, Vol 141, Issue 9 2912-2917, Copyright © 1988 by American Association of Immunologists

ARTICLES

Induction of aggregation and enhancement of proliferation and IL-2 secretion in human T cells by antibodies to CD43

B Axelsson, R Youseffi-Etemad, S Hammarstrom and P Perlmann
Department of Immunology, University of Stockholm, Sweden.

CD43 (large sialoglycoprotein) is a heavily glycosylated protein expressed on virtually all thymus-derived lymphocytes, on a subpopulation of B cells and on granulocytes. Recently, an anti-CD43 mAb (L10) was shown to induce proliferation in T cells comparable to that induced by anti-CD3. The L10 antibody was reported to react with both sialylated and desialylated CD43. In order to further elucidate the role of CD43 in various T cell functions we have studied the biologic properties of two other mAb (B1B6 and E11B, IgG1) directed against sialic acid-dependent epitopes on CD43. Addition of low amounts of antibody (5 to 10 ng/ml) to freshly isolated T cells or to T cell lines resulted in a rapid clustering of the cells. Fab fragments were also active albeit at a 10-fold higher concentration. Aggregation was dependent on active cell metabolism (inhibited by azide and at low temperatures), on the presence of divalent cations (Mg2+) and was inhibited by antibodies to CD18 but not by antibodies to CD11a (leukocyte function-associated Ag-1 alpha). B1B6 and E11B were poorly mitogenic when added alone in soluble form to PBL or to T cells. However, supernatants from cultures of PBL treated with B1B6 for 2 days contained IL-2 activity. No increase in the number of CD25+ cells was seen during the same period. Exogenously added IL-2 did not synergize with B1B6 or E11B in activation of PBL, whereas proliferation was significantly increased by the addition of the antibodies to activation systems with low endogenous production of IL-2 (PMA or soluble anti- CD3). The anti-CD43 antibodies amplified T cell proliferative responses induced by Con A or leukoagglutinin from Phaseolus vulgaris. F(ab')2 fragments enhanced proliferation significantly better than Fab fragments suggesting that cross-linking of CD43 molecules was an essential features of the amplifying signal. Compared with cultures activated by Con A alone, an increased number of CD25+ cells and of blast cells as well as an increased IL-2 production was observed in cultures activated by B1B6-Con A. The results indicate that regulatory signals, which may function to modify homo- or heterotypic T cell adhesion as well as autocrine production of IL-2, can be transduced through CD43.


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