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The Journal of Immunology, Vol 144, Issue 11 4092-4100, Copyright © 1990 by American Association of Immunologists
ARTICLES |
NH Dang, Y Torimoto, K Deusch, SF Schlossman and C Morimoto
Division of Tumor Immunology, Dana Farber Cancer Institute, Boston, MA 02115.
We have recently developed a mAb, anti-1F7, which defines a family of structures found to include the molecule recognized by anti-Ta1 (CD26). In this paper, we demonstrated that binding of 1F7 by solid-phase immobilized anti-1F7 mAb but not anti-Ta1 mAb has a comitogenic effect by inducing proliferation of human CD4+ T lymphocytes in conjunction with submitogenic doses of anti-CD3 or anti-CD2. The proliferative response induced via the CD3-1F7 or CD2-1F7 pathways is associated with the IL-2 autocrine pathway, including IL-2 production. IL-2R expression and anti-IL-2R (Tac) inhibition. Furthermore, solid-phase immobilization of anti-1F7 but not anti-Ta1 acts in conjunction with submitogenic doses of PMA to mediate a comitogenic effect in the absence of anti-CD3 or anti-CD2, leading to CD4+ T cell proliferation. PMA treatment, in the meantime, leads to enhanced expression of 1F7 on the T cell surface. Despite its functional association with both pathways of activation, however, the 1F7 structure is not comodulated with the CD3/TCR complex nor the CD2 molecule. These findings thus suggest that the CD26 Ag is involved in CD3 and CD2-induced human CD4+ T cell activation.
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