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The Journal of Immunology, Vol 151, Issue 5 2368-2379, Copyright © 1993 by American Association of Immunologists
ARTICLES |
NK Damle, K Klussman, G Leytze, A Aruffo, PS Linsley and JA Ledbetter
Bristol-Myers Squibb Pharmaceutical Research Institute, Seattle, WA 98121.
Integrin ligands intercellular adhesion molecule-1 (ICAM-1) and vascular cell adhesion molecule-1 (VCAM-1) can efficiently costimulate proliferation of resting T cells but not that of Ag-specific T cells. In contrast, CD28 ligand B7 and CD2 ligand leukocyte function- associated Ag (LFA-3) can support IL-2 synthesis and proliferation of Ag-specific T cells more efficiently than that of resting T cells. The molecular basis for this differential costimulation of T cells is poorly understood. In this study, using mAb and soluble IgC gamma 1 chimeras of these adhesion molecules, we demonstrate that coligation of the TCR and CD11a/CD18 (LFA-1/beta 2 integrin) or CD29/CD49d (very late activation Ag-4/beta 1 integrin) using anti-TCR mAb and either ICAM-1 or VCAM-1 induces activation-dependent death of DRw6-specific CD4+ T cells. Similar coligation of the TCR with CD2 or CD28 using either mAb or ligands LFA-3 or B7 not only lacked the ability to induce death but also failed to reverse or inhibit integrin-facilitated death of DRw6- specific T cells. Each of these ligands augmented anti-TCR mAb-induced transcription of IL-2 and IL-4 genes. Exogenous addition of IL-2 and IL- 4 did not reverse the integrin-supported T cell death. The death- promoting costimulatory effects of ICAM-1 and VCAM-1 were observed with Ag-specific chronically stimulated T cells but not with either resting T cells or those activated in short-term cultures. Treatment of T cells with cyclosporin A or a protein tyrosine kinase inhibitor herbimycin A inhibited ICAM-1 or VCAM-1-promoted activation-induced T cell death. The Ag-specific T cells that survived death-promoting effects of ICAM-1 or VCAM-1 proliferated efficiently upon restimulation with these ligands. Exposure of DRw6-specific T cells to DRw6+ B7+ ICAM-1+ LFA-3+ VCAM-1+ APC but not DR3+ B7+ ICAM-1+ LFA-3+ VCAM-1+ APC induced death of these T cells. This effect was blocked by pretreatment of T cells with mAb directed at CD18 or CD29 but not with those against CD2 or CD28. Taken together, these results suggest that TCR-directed engagement of integrins by their ligands ICAM-1 or VCAM-1 induces activation-dependent death of some perhaps more differentiated Ag- specific T cells and this may be an important homeostatic mechanism by which functional expression of Ag-specific T cells is regulated during an ongoing immune response.
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