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. 1996 Aug;40(8):1919–1923. doi: 10.1128/aac.40.8.1919

Anticryptococcal effect of amphotericin B is mediated through macrophage production of nitric oxide.

M Tohyama 1, K Kawakami 1, A Saito 1
PMCID: PMC163440  PMID: 8843304

Abstract

Amphotericin B (AmB) is a classical antifungal drug and one of the most effective antifungal drugs for the treatment of systemic fungal infection. It is also known to have various immunomodulating activities other than its direct antifungal effect. In the present study, we demonstrated that AmB augmented gamma interferon (IFN-gamma)-induced killing potentials of murine peritoneal macrophages against Cryptococcus neoformans in a dose-dependent manner. This effect was strongly blocked by NG-monomethyl-L-arginine, a competitive inhibitor of nitric oxide (NO) synthesis. In addition, AmB markedly augmented macrophage NO production induced by IFN-gamma with a dose-response curve similar to that seen with its effect on the anticryptococcal activity. These effects were partially mediated by either tumor necrosis factor alpha or interleukin-1, because AmB enhanced IFN-gamma-induced production of these cytokines by macrophages and their specific antibodies partially inhibited the AmB-induced enhancement of NO generation when they were used separately. Our results indicate that AmB induces the production of tumor necrosis factor alpha and IL-1 by macrophages and augments their anticryptococcal activity through triggering the NO-dependent pathway.

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Selected References

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