The Journal of Experimental Medicine
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Journal of Experimental Medicine, Vol 158, 252-257, Copyright © 1983 by Rockefeller University Press

ARTICLES

Metabolism of formycin B by Leishmania amastigotes in vitro. Comparative metabolism in infected and uninfected human macrophages

JD Berman, P Rainey and DV Santi

Formycin B is metabolized by cutaneous Leishmania amastigotes within cultured human macrophages to give formycin B 5'-monophosphate and formycin A 5'-mono-, di-, and triphosphates. Formycin A is also incorporated into RNA. The activity of formycin B against amastigotes was correlated with the levels of formycin A metabolites formed in the parasites. Uninfected macrophages also convert formycin B into the same products, but the levels are markedly lower than those seen in infected macrophages. The results suggest that a sufficient therapeutic index exists to warrant consideration of formycin B as an anti-leishmanial drug in humans.
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