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J Antibiot (Tokyo). 1989 Feb;42(2):174-8.

L-671,329, a new antifungal agent. III. In vitro activity, toxicity and efficacy in comparison to aculeacin.

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Department of Basic Microbiology, Merck Sharp & Dohme Research Laboratories, Rahway, N.J. 07065-0900.


L-671,329 is a novel, echinocandin-like natural product that possesses potent anti-Candida activity, including activity against Candida parapsilosis. The in vitro MICs of L-671,329 were comparable to aculeacin against 18 yeasts and three filamentous fungi in an agar dilution assay. L-671,329 lysed mouse red blood cells (RBCs) at a concentration of 400 micrograms/ml, but not at 50 or 12.5 micrograms/ml. Aculeacin lysed RBCs at 400 and 50 micrograms/ml. L-671,329 significantly prolonged survival of mice infected with Candida albicans (ED50 3.38 mg/kg) following twice-daily intraperitoneal dosing for five consecutive days. The prolongation observed was greater than that seen with aculeacin therapy (ED50 6.44 mg/kg). No acute or chronic toxicities of L-671,329 or aculeacin (as measured by mortality) were detected at a concentration of 100 mg/kg following intraperitoneal administration (TD50 greater than 100 mg/kg). Both L-671,329 and aculeacin eradicated cells of C. albicans from the kidneys of infected mice. L-671,329 eradicated the yeast at therapeutic concentrations of 12.5 to 100 mg/kg. Aculeacin eradicated yeast cells at therapy concentrations of 25 to 100 mg/kg. L-671,329 has potential as an anti-Candida compound.

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