Abstract
Although gamma delta T cell receptor-bearing lymphocytes (gamma delta T cells) constitute a significant minority of circulating and tissue-associated T lymphocytes, the mechanism responsible for the activation of these cells is unknown. To address this question, resting gamma delta TCR+, CD3+, CD4-, CD8- cells isolated from the blood of healthy volunteers were cultured with allogeneic dendritic cells (DC) or monocytes, and their proliferative response measured. DC alone induced gamma delta T cells to proliferate, with a peak response on the sixth day of culture. Pretreatment of DC with an anti-HLA-DR mAb, but not anti-HLA class I or anti-CD1 mAbs, inhibited the response of gamma delta T cells. Antibodies to gamma delta T cell receptor, CD2, CD3, or CD11a were also inhibitory, whereas antibodies to alpha beta T cell receptor, CD4, CD5, and CD8 had no effect. Although only 40-60% of freshly isolated gamma delta T cells expressed CD28, mAbs directed against CD28 or its ligand, CD80, were markedly inhibitory. Moreover, removal of CD28+ cells from the gamma delta T cell population nearly abrogated the response to DC. These results demonstrate that resting gamma delta T cells recognize and respond to MHC class II determinants on allogeneic DC in a manner that is highly dependent on the CD28 activation pathway as well as molecules such as CD2 and CD11a that mediate cell-to-cell adhesion.
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Selected References
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