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The Journal of Immunology, 1999, 162: 6708-6715.
Copyright © 1999 by The American Association of Immunologists

Expression and Contribution of B7-1 (CD80) and B7-2 (CD86) in the Early Immune Response to Leishmania major Infection1

M. Merle Elloso and Phillip Scott2

Department of Pathobiology, University of Pennsylvania School of Veterinary Medicine, Philadelphia, PA 19104

CD28 interactions promote T cell responses, and whether B7-1 or B7-2 is utilized may influence Th cell subset development. CD28 blockade by CTLA-4Ig treatment or by targeted gene disruption has yielded different conclusions regarding the role of CD28 in the development of Th1 and Th2 cells following Leishmania major infection. In this study, we demonstrate that B7-mediated costimulation is required for the development of the early immune response following infection of resistant or susceptible mice. In contrast, CD28-/- BALB/c mice infected with L. major produce cytokines comparable to those of infected wild-type mice. Treatment of CD28-/- mice with CTLA-4Ig did not diminish this response, suggesting that a B7-independent pathway(s) contributes to the early immune response in these mice. In conventional BALB/c or C3H mice, B7-2 functions as the dominant costimulatory molecule in the initiation of early T cell activation following L. major infection, leading to IL-4 or IFN-{gamma} production, respectively. The preferential interaction of B7-2 with its ligand(s) in the induction of these responses correlates with its constitutive expression relative to that of B7-1. However, B7-1 can equally mediate costimulation for the production of either IL-4 or IFN-{gamma} when expressed at high levels. Thus, in leishmaniasis, costimulation involving B7-1 or B7-2 can result in the production of either Th1 or Th2 cytokines, rather than a preferential induction of one type of response.




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