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In vitro induction of T cell anergy by blocking B7 and early T cell costimulatory molecule ETC-1/B7-2
1Department of Inflammation and Autoimmune Diseases, Hoffmann-La Roche Research Center, Nutley, New Jersey 07110.
APC-associated B7 and ETC-1/B7-2 are two major costimulatory molecules for full activation of T lymphocytes during auto- and allogeneic immune responses. In this report, we further examine the role of the two molecules in murine CD4+ T cell activation and anergy development. As suggested in antibody blocking studies, optimal activation of CD4+ T cells in response to anti-CD3 stimulation requires collaborative signaling through the two molecules. Simultaneous blockade of B7 and ETC-1/B7-2 renders CD4+ T cells unresponsive to anti-CD3 restimulation. PCR analysis and cytokine reconstitution studies show that the observed unresponsiveness is correlated to a significant reduction of Th1-type cytokine production, suggesting B7 and ETC-1/B7-2-mediated costimulatory signaling may be specifically active in regulation of the function of the Th1 subset.
APC-associated B7 and ETC-1/B7-2 are two major costimulatory molecules for full activation of T lymphocytes during auto- and allogeneic immune responses. In this report, we further examine the role of the two molecules in murine CD4+ T cell activation and anergy development. As suggested in antibody blocking studies, optimal activation of CD4+ T cells in response to anti-CD3 stimulation requires collaborative signaling through the two molecules. Simultaneous blockade of B7 and ETC-1/B7-2 renders CD4+ T cells unresponsive to anti-CD3 restimulation. PCR analysis and cytokine reconstitution studies show that the observed unresponsiveness is correlated to a significant reduction of Th1-type cytokine production, suggesting B7 and ETC-1/B7-2-mediated costimulatory signaling may be specifically active in regulation of the function of the Th1 subset.