Protective effect of muramyl dipeptide analogs against infections of Pseudomonas aeruginosa or Candida albicans in mice.

Infection and Immunity
E B Fraser-Smith, T R Matthews

Abstract

Two analogs of N-acetylmuramyl-L-alanyl-D-isoglutamine (muramyl dipeptide) were found to give better protection than muramyl dipeptide against intraperitoneal Pseudomonas aeruginosa infection or intravenous Candida albicans infection in mice. The analogs tested were N-acetyl-nor-muramyl-L-alanyl-D-isoglutamine and N-acetylmuramyl-L-alpha-amino-butyryl-D-isoglutamine. The optimum treatment was 80 mg/kg per day given once daily for 4 consecutive days before infection by the intraperitoneal, intravenous, or subcutaneous route. Dose response was limited. The compounds were not orally active. Synergism was seen between N-acetyl-nor-muramyl-L-alanyl-D-isoglutamine and gentamicin. No postinfection protection was observed. A nonspecific stimulation of macrophage cells by muramyl dipeptide analogs may contribute to the protection because antiinfective activity against Listeria monocytogenes given intraperitoneally was achieved with CBA mice.

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