Therapeutic and prophylactic efficacy of aminocandin (IP960) against disseminated candidiasis in mice.

Abstract

Extended interval dosing of the echinocandins has been suggested as a potential strategy to overcome the need for daily intravenous administration. This study evaluated the therapeutic and prophylactic efficacy of single doses of aminocandin, a new echinocandin in preclinical development, in a murine model of invasive candidiasis. For therapy, groups of mice were infected with Candida albicans, followed by a single dose of aminocandin (1-15 mg/kg) or placebo (mannitol 5% w/v) administered 1 day after inoculation. As prophylaxis, mice were given a single dose (5 or 30 mg/kg) of aminocandin, caspofungin, or placebo at increasing intervals between dose and inoculation. In both treatment and prophylaxis studies, survival was assessed at 21 days post-inoculation. The reduction in fungal burden was assessed in kidney tissue on day 8 post-inoculation. For treatment, single doses of aminocandin of >/=2.5 mg/kg prolonged survival significantly. In addition, the two doses evaluated for reductions in fungal burden (5 and 15 mg/kg) revealed fungicidal activity. As prophylaxis, both aminocandin and caspofungin 5 and 30 mg/kg prolonged survival when given 7 days before inoculation. Aminocandin and caspofungin 30 mg/kg were both able to prolong survival when the interval between dose and inoculation was increased to 10 days. When this interval was extended to 14 days, only aminocandin 30 mg/kg prolonged survival and reduced fungal burden. These results demonstrate that single doses of aminocandin are effective as treatment and prophylaxis, and suggest that extended interval dosing may be a useful strategy for treating invasive candidiasis.

• Authors: L K Najvar, R Bocanegra, N P Wiederhold, C Lambros, N Najarian, T F Patterson, J R Graybill
• Journal: Clinical microbiology and infection : the official publication of the European Society of Clinical Microbiology and Infectious Diseases (Clin Microbiol Infect) Vol. 14 Issue 6 Pg. 595-600 (Jun 2008) ISSN: 1469-0691 [Electronic] England
• PMID: 18397335 (Publication Type: Journal Article, Research Support, N.I.H., Extramural, Research Support, Non-U.S. Gov't)

Chemical References

• Antifungal Agents
• Echinocandins
• Lipopeptides
• Lipoproteins
• aminocandin
• Caspofungin

Topics

• Animals
• Antifungal Agents (administration & dosage, therapeutic use)
• Candida albicans (drug effects)
• Candidiasis (drug therapy, prevention & control)
• Caspofungin
• Colony Count, Microbial
• Disease-Free Survival
• Echinocandins (administration & dosage, therapeutic use)
• Kidney (microbiology)
• Lipopeptides
• Lipoproteins (administration & dosage, therapeutic use)
• Male
• Mice
• Mice, Inbred ICR