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. 1987 Dec;70(3):520–528.

Activation of pulmonary macrophages for fungicidal activity by gamma-interferon or lymphokines.

E Brummer 1, D A Stevens 1
PMCID: PMC1542173  PMID: 3124995

Abstract

The ability of murine recombinant gamma interferon (IFN) or lymphokines to enhance the fungicidal activity of murine pulmonary macrophages (PuM) was studied in in vitro. PuM monolayers were incubated overnight with IFN, lymph node cells (LNC) plus concanavalin A, supernatants from Con A stimulated LNC or spleen cell cultures (Con A Sup), or tissue culture medium (TCM) +/- Con A (5 micrograms/ml) or +/- lipopolysaccharide (LPS, 10 ng to 10 micrograms/ml). After treatment, culture fluids were removed and PuM were challenged for 4 h with the yeast-form Blastomyces dermatitidis or 2 h with Candida albicans. Inoculum colony forming units (CFU) of B. dermatitidis were significantly reduced by PuM treated with 1000 U/ml of IFN (25 +/- 3%), Con A Sup (25 +/- 3%) or LNC plus Con A (37-44%), but not by TCM, ConA or LPS. Candida albicans was killed by PuM treated with Con A Sup (33 +/- 8%) or LNC plus Con A (30-43%), but not by TCM, Con A, or LPS, and the activity of Con A Sup was neutralized by anti-IFN antibody. Candida albicans was not significantly killed by PuM treated with IFN doses ranging from 1 to 10(5) U/ml; nor did addition of LPS to IFN, or prolonged (3 day) treatment with IFN, result in significant killing of C. albicans by PuM. However, IFN (100 U/ml) could activate resident peritoneal macrophages for significant candidacidal activity (63%). These data indicate that PuM can be activated for fungicidal activity, and that PuM differ from resident peritoneal macrophages with regard to induction of candidacidal activity by recombinant gamma-IFN.

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Selected References

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