PMID: 7536957May 1, 1995Paper

Anti-GD3 antibodies are potent activators of human gamma/delta and alpha/beta positive T cells

Scandinavian Journal of Immunology
J SchlaakW Dippold

Abstract

The ganglioside GD3 has a variety of biological functions. These include stimulatory effects on proliferation, natural killer activity and cytokine production by freshly isolated peripheral T cells. In this study we have characterized anti-GD3 antibody (MoAb Z21) mediated effects on T cell clones. Our data indicate that alpha/beta TCR CD4+ and CD8+ as well as gamma/delta TCR positive T cells can be stimulated resulting in proliferation and cytokine production. This effect could be blocked by cyclosporin A and did not involve the LFA-3 or CD4 molecule. Apart from IFN-gamma and IL-2 production by T helper 1 and T helper 0 cells we have observed production of IL-4 and IL-10 by T helper 2 cells indicating that the GD3 molecule is not a marker for a certain functional T cell subset. In contrast to anti-CD3 mediated activation, the responsiveness of T cells to stimulation via GD3 was dependent on the cell surface expression of the molecule and could be enhanced by costimulation via CD2, CD3, CD26 or CD28. In addition, anti-GD3 antibodies delivered a potent costimulatory signal for antigen-induced proliferation of CD4+ T lymphocytes. In summary, our experiments illuminate the mechanisms of anti-GD3 antibody induced T cell activation.

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