Affiliation:
1. Department of Microbiology, George Washington University School of Medicine, Washington, D.C. 20037.
Abstract
Growth on Trypanosoma musculi in the murine host was limited by the availability of host purines. A portion of the spleen cells of infected mice (many of them granulocytes) displayed high levels of adenosine deaminase (ADA) and purine nucleoside phosphorylase, probably as a compensatory response to extracellular purine deficiency. Injections of adenosine or 2-deoxycoformycin stimulated significant increases in the growth of parasites. 2-Deoxycoformycin treatment also diminished parasite-induced splenomegaly. Treatment of mice with polyethylene glycol-modified ADA, a slowly catabolized form of ADA, had no effect on the course of T. musculi infection, indicating that the parasites can utilize purines other than adenosine. The apparent competition between parasites and host cells for available purines suggests that depletion of extracellular purines should be considered as an approach to treating extracellular trypanosome infections.
Publisher
American Society for Microbiology
Subject
Infectious Diseases,Immunology,Microbiology,Parasitology
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