Steroid Interference with Antifungal Activity of Polyene Antibiotics
Abstract
Wide differences exist among the polyene antibiotics, nystatin, rimocidin, filipin, pimaricin, and amphotericin B, with reference to steroid interference with their antifungal activities against Candida albicans. Of the numerous steroids tested, ergosterol was the only one which effectively antagonized the antifungal activity of all five polyene antibiotics. The antifungal activities of nystatin and amphotericin B were the least subject to vitiation by the addition of steroids other than ergosterol, and those of filipin, rimocidin, and pimaricin were the most sensitive to interference. Attempts to delineate the structural requirements of steroids possessing polyene-neutralizing activity in growing cultures of C. albicans are discussed. The ultraviolet absorbance of certain antibiotic steroid combinations was also studied.
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