Hydroxyurea inhibits antigen-induced lymphoproliferation in vitro at a concentration at which it does not inhibit PHA-induced HIV replication. Hydroxyurea may inhibit HIV-1 in CD4+ T cells in vivo not only by decreasing the amount of intracellular deoxynucleotides, but more specifically by interfering with antigen-dependent T-cell activation, thereby causing a reduction in the number of HIV target cells.
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