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An impairment of the capacity to generate alloantigen-specific cytotoxic T lymphocytes (CTL) was observed in mixed lymphocyte cultures (MLC) established with spleen cells from mice infected with Schistosoma mansoni. This impairment, which was observed as early as the eighth week of infection, could be abrogated by the fractionation of spleen cell suspensions by the carbonyl iron/magnet method prior to the establishment of MLC. Cocultivation of normal spleen cells with increasing numbers of splenocytes from S. mansoni-infected syngeneic mice resulted in a dosage-dependent suppression of CTL generation. This "infectious suppression" was not sensitive to antiserum against mouse thymic lymphocyte antigen (MTLA). The present studies suggest the role of a macrophage rather than a T cell as the suppressor cell in this model of cell-mediated immunity in schistosome-infected mice.
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