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In Vitro Amphotericin B Effects on Growth, Viability and Dimorphism of Paracoccidioides brasiliensis : Reversal of the Treatment
Author(s) -
Jesuino Rosália Santos Amorim,
Bastos Ascenço Soares Renata,
SalemIzacc Silvia Maria,
Pereira Maristela,
Felipe Maria Sueli Soares,
Almeida Soares Célia Maria
Publication year - 1997
Publication title -
microbiology and immunology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.664
H-Index - 70
eISSN - 1348-0421
pISSN - 0385-5600
DOI - 10.1111/j.1348-0421.1997.tb01187.x
Subject(s) - paracoccidioides brasiliensis , biology , amphotericin b , microbiology and biotechnology , paracoccidioidomycosis , paracoccidioides , dimorphic fungus , in vitro , antifungal , biochemistry , yeast
The in vitro effects of amphotericin B deoxycholate suspension (fungizone) on Paracoccidioides brasiliensis growth, cell viability and transformation were investigated. We also analyzed the protein synthesis patterns of both cellular forms, yeast and mycelium in the presence of AmB. This drug, at 30 μg/ml, highly inhibited yeast growth, which could be recovered depending on treatment time, where the most effective reversion was observed after 6 hr of incubation. The yeast cell viability, that had been partially affected by the drug, could also be efficiently recovered after AmB was removed. The effect of AmB on the cellular dimorphism process showed a strong reduction in the mycelium to yeast transformation (80% inhibition compared to the control without the drug). On the other hand, the transformation from yeast to mycelium in the presence of AmB was 50% affected, relative to the control. In contrast to the growth and cell viability experiments, the reversion effects on dimorphism were partial when the drug was removed, even with only 6 hr treatment. The two‐dimensional gels of 35 S‐labeled proteins revealed a strong reduction in the three species of 80, 71 and 56 kDa in yeast and mycelium when treated with AmB.