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Host granulomatous inflammation in murine schistosomiasis mansoni is a T cell-mediated immune response, which, at the chronic stage of the disease, undergoes T suppressor lymphocyte-dependent modulation. In the present study this phenomenon was further analyzed in vitro. Spleen cells of mice undergoing modulation (20 wk of infection) when mixed with spleen cells of animals exhibiting vigorous granulomatous responses (8 wk of infection) abrogated in vitro migration inhibition factor (MIF) production by the latter. Characterization of the delayed-type hypersensitivity T lymphocytes involved in lymphokine production showed that they belonged to the Lyt-1+ subset and did not express I region-encoded antigens. In contrast, T lymphocytes involved in the suppression of MIF activity belonged to the Lyt-2+ subpopulation of cells, which expressed I-J- and I-C-subregion determinants. These results suggest that the modulation of the granulomatous hypersensitivity response in mice is the result of T-T cell interaction with subsequent regulation of inflammatory lymphokine production.

the journal of experimental medicine/the journal of experimental medicine

Regulation of granulomatous inflammation in murine schistosomiasis. In vitro characterization of T lymphocyte subsets involved in the production and suppression of migration inhibition factor.