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- W2405719659 abstract "The effects of hydroxyurea (HU), an inhibitor of ribonucleotide reductase, on the replication of human immunodeficiency virus type 1 (HIV-1) in activated peripheral blood mononuclear cells were studied. The inhibition of HIV-1 replication by HU alone was dose dependent, with a 90% inhibitory concentration of 0.4 mM, a plasma concentration tolerated by patients with oncological diseases. HU at lower concentrations (< 0.1 mM) was found to potentiate the antiviral activity of 2',3'-dideoxyinosine (ddl), 3'-azido-2',3'- dideoxythymidine, and 2',3'-dideoxycytidine against HIV-1, with the potentiation being ddl greater than 3'-azido-2',3'- dideoxythymidine = 2',3'-dideoxycytidine. In the presence of 0.1 mM HU, the 90% inhibitory concentration of ddl was reduced by 6-fold in activated peripheral blood mononuclear cells. The potentiating effect of HU on ddl action was time dependent, with the greatest inhibition of HIV-1 growth being seen when HU was present during and after virus adsorption, i.e., apparently coinciding with the time of proviral DNA synthesis. A brief incubation of activated cells with HU and ddl at low concentrations before virus exposure reduced p24 production by > 50%. Analyses using high performance liquid chromatography and enzymatic assays suggested that the greater degree of potentiation by HU of the action of ddl, compared with the other dideoxynucleosides, is due to the more effective inhibition by HU of dATP synthesis, compared with the synthesis of the other deoxynucleoside triphosphates (dGTP, dTTP, and dCTP). The present study suggests that, for appropriate agents, pharmacological reduction of deoxynucleoside triphosphate levels represents a potential therapeutic approach for inhibition of HIV-1 replication." @default.
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- W2405719659 date "1994-10-01" @default.
- W2405719659 modified "2023-09-23" @default.
- W2405719659 title "Anti-human immunodeficiency virus type 1 activity of hydroxyurea in combination with 2',3'-dideoxynucleosides." @default.
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