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The Journal of Immunology, Vol 138, Issue 3 902-907, Copyright © 1987 by American Association of Immunologists
ARTICLES |
JP Farrell and CE Kirkpatrick
Leishmania major infection in genetically susceptible BALB/c mice is associated with the development of chronic primary lesions as well as multiple metastatic lesions. Spleen cells from these mice were shown to have depressed in vitro responses to concanavalin A (Con A) that coincided with the development of indomethacin-sensitive suppressor cells. Depressed responses to Con A were noted as early as 1 wk after parasite inoculation and correlated with the increased production of prostaglandin E2 (PGE2) by spleen cells from infected mice. Mice induced by prior irradiation (550 rad) to heal infection did not develop indomethacin-reversible depression in responsiveness to Con A. Although macrophages appear to be the major source of PGE2 production, in vitro studies indicate that infection per se is not a sufficient stimulus to initiate prostaglandin (PG) synthesis, suggesting the involvement of other cell types. Mice treated in vivo with indomethacin exhibited significantly fewer metastatic lesions than control mice, suggesting that PG may play a role in the exacerbation of cutaneous disease in these animals.
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