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Dipyridamole, a commonly used coronary vasodilator and antithrombotic drug, was recently shown to potentiate the activity of 3'-azido-3'-deoxythymidine and 2',3'-dideoxycytidine against the human immunodeficiency virus type 1 (HIV-1) in human monocyte-macrophages in vitro. We report in the present paper that in uninfected monocyte-macrophages dipyridamole significantly inhibits cellular salvage of [3H]deoxycytidine, whereas it does not affect the salvage of [3H]dideoxycytidine. Similar differential inhibition by dipyridamole of the salvage of thymidine, as opposed to 3'-azido-3'-deoxythymidine, was reported previously (G. V. Betageri, J. Szebeni, K. Hung, S. S. Patel, L. M. Wahl, M. Corcoran, and J. N. Weinstein, Biochem. Pharmacol. 40:867-870, 1990). Taken together, these observations suggest that inhibition of the salvage of competing physiological nucleosides may explain or contribute to the potentiating effect of dipyridamole on these antiviral dideoxynucleoside drugs.

antimicrobial agents and chemotherapy

Differential inhibition of 2'-deoxycytidine salvage as a possible mechanism for potentiation of the anti-human immunodeficiency virus activity of 2',3'-dideoxycytidine by dipyridamole