Activity of aminocandin (IP960) compared with amphotericin B and fluconazole in a neutropenic murine model of disseminated infection caused by a fluconazole-resistant strain of Candida tropicalis

J Antimicrob Chemother. 2005 Sep;56(3):590-3. doi: 10.1093/jac/dki268. Epub 2005 Jul 26.

Abstract

Objectives: To compare the activity of aminocandin (IP960), a new echinocandin with broad-spectrum in vitro activity against Aspergillus and Candida spp., with that of amphotericin B and fluconazole in a temporarily immunocompromised murine model of disseminated candidiasis.

Methods: Mice were rendered neutropenic with cyclophosphamide and infected intravenously 3 days later with a fluconazole-resistant Candida tropicalis strain. Mice were treated with intraperitoneal amphotericin B (5 mg/kg/dose), oral fluconazole (50 mg/kg/dose), intravenous aminocandin (0.1--5 mg/kg/dose) or solvent control for 9 days. Mice were observed for survival and survivors were sacrificed 11 days post-infection. Kidneys, liver, brain and lungs were removed for semi-quantitative culture.

Results: Control mice had 90--100% mortality. After infection with C. tropicalis, aminocandin 2.5 and 5 mg/kg/day and amphotericin B yielded 80% survival; aminocandin 1 mg/kg/day yielded 70% survival; aminocandin 0.25 and 0.1 mg/kg/day yielded 30% and 20% survival, respectively; and fluconazole 50 mg/kg/day and control regimens yielded 10% and 0--10% survival, respectively. Aminocandin 2.5 and 5.0 mg/kg/day and amphotericin B were superior in reducing mortality compared with aminocandin 0.25 and 0.1 mg/kg/day, fluconazole and controls (P<0.047). The only regimen to reduce organ burdens below detectable levels was amphotericin B, which cleared 40% of mice. All organ burdens in the aminocandin 1.0, 2.5 and 5.0 mg/kg/day and amphotericin B regimens were significantly lower than other groups (P<0.02).

Conclusions: The data demonstrate that aminocandin at doses of >or=1.0 mg/kg/day is as effective as amphotericin B at improving survival and reducing organ burdens in this murine model of disseminated C. tropicalis.

Publication types

  • Comparative Study
  • Research Support, Non-U.S. Gov't

MeSH terms

  • Amphotericin B / administration & dosage
  • Amphotericin B / pharmacology*
  • Animals
  • Antifungal Agents / pharmacology*
  • Candida tropicalis / drug effects*
  • Candida tropicalis / pathogenicity
  • Candidiasis / drug therapy*
  • Candidiasis / etiology
  • Candidiasis / microbiology
  • Candidiasis / mortality
  • Cyclophosphamide / toxicity
  • Disease Models, Animal
  • Drug Resistance, Fungal
  • Fluconazole / administration & dosage
  • Fluconazole / pharmacology*
  • Immunocompromised Host
  • Lipopeptides
  • Lipoproteins / pharmacology*
  • Male
  • Mice
  • Mice, Inbred Strains
  • Neutropenia / chemically induced
  • Neutropenia / complications
  • Survival Rate
  • Treatment Outcome

Substances

  • Antifungal Agents
  • Lipopeptides
  • Lipoproteins
  • aminocandin
  • Amphotericin B
  • Cyclophosphamide
  • Fluconazole