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Anticryptococcal activity of amphotericin B-stimulated macrophages.

Amphotericin B (AmB) and its methyl ester derivative (AME) are immunoadjuvants with macrophage stimulating properties. Cultures containing AmB and murine peritoneal macrophages showed synergistic anticryptococcal activity. The antifungal activity was associated with AmB-stimulated macrophages and with their culture supernatants. Photoinactivation of the residual AmB in the macrophage culture supernatant did not result in the loss of antifungal activity. AmB-stimulated macrophage culture supernatants inhibited the growth of C. neoformans in a dose responsive manner and the activity was destroyed by incubation at 100 degrees C but not at 60 degrees C.