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The Journal of Immunology, Vol 144, Issue 4 1418-1424, Copyright © 1990 by American Association of Immunologists
ARTICLES |
FJ Dumont, MR Melino, MJ Staruch, SL Koprak, PA Fischer and NH Sigal
Department of Immunology Research, Merck, Sharp and Dohme Research Laboratories, Rahway, NJ 07065.
The structurally related immunosuppressive macrolides FK-506 and rapamycin (RAP) were previously shown to inhibit T cell stimulation through different mechanisms. FK-506 acts similarly to cyclosporin A (CsA) and prevents IL-2 production and IL-2R expression. RAP has little or no effect on these events but markedly impedes the response to IL-2. The present study was initiated to examine the possibility of a complementation between the immunosuppressive actions of RAP and FK-506 or CsA on various murine T cell responses. RAP potentiated the effect of CsA on proliferation and IL-2R expression in T cells stimulated with ionomycin + PMA. However, in the same system, RAP acted as a potent antagonist of FK-506 suppression. RAP also blocked FK-506- but not CsA- mediated inhibition of IL-2 mRNA induction. By using model systems sensitive to inhibition by RAP but not FK-506 we further demonstrated that FK-506 reciprocally behaves as an antagonist of RAP. In one such model, the stimulation of splenic T cells with IL-2 + PMA, FK-506, but not CsA, reversed the suppressive effect of RAP on proliferation. FK- 506 also antagonized RAP-mediated inhibition with respect to the induction of Ly-6E Ag expression by IFN in YAC cells. To explore further the competition between the two macrolides at the cellular level, we performed binding experiments with a radiolabeled derivative of FK-506. Both FK-506 and RAP, but not CsA, inhibited the binding of this probe in YAC cells. Taken together, these data demonstrate that FK- 506 and RAP antagonize each other's biologic activity and physically interact with a common receptor site(s) in T cells. Moreover, CsA acts at a site distinct from the cellular target(s) of FK-506 or RAP.
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