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In vitro activity of immunosuppressive agents against Cryptococcus neoformans

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EDICIONES DOYMA S A
DOI: 10.1016/j.eimc.2020.09.014

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Synergism; Amphotericin B; Tacrolimus; Cyclosporine A; Cryptococcus spp.

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  1. Brazilian Agencies FAPERGS [2261-12]

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This study evaluated the in vitro activity of tacrolimus and cyclosporine in combination with amphotericin B and fluconazole against C. neoformans, and found that these drug combinations showed synergistic effects against certain isolates, potentially offering novel therapeutic strategies for this opportunistic mycosis.
Introduction: Infections caused by Cryptococcus neoformans are a major cause of fungal mortality in HIVinfected/AIDS patients and in those receiving organ transplants. We evaluated the in vitro activity of tacrolimus and cyclosporine in combination with amphotericin B and fluconazole against C. neoformans. Methods: MICs were determined against a total of 30 clinical isolates of C. neoformans by the microdilution method following the CLSI M27-A3 guidelines and by the checkerboard method. Results: Tacrolimus and cyclosporine A showed in vitro activity against cryptococcal isolates. The combination of amphotericin B with cyclosporine A or tacrolimus was synergistic against 90% and 30% of isolates, respectively. Synergism was also observed with the combination of fluconazole with cyclosporine A or tacrolimus, against 70% and 20% of isolates, respectively. Conclusions: The synergistic interactions between the calcineurin inhibitors and antifungal drugs against C. neoformans isolates, could potentially have a role in devising novel therapeutic strategies for this opportunistic mycosis. (C) 2020 Sociedad Espanola de Enfermedades Infecciosas y Microbiologia Clinica. Published by Elsevier Espana, S.L.U. All rights reserved.

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