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Certain bis(heteroaryl)piperazines (BHAPs) are potent inhibitors of the human immunodeficiency virus type 1 (HIV-1) reverse transcriptase (RT) at concentrations lower by 2-4 orders of magnitude than that which inhibits normal cellular DNA polymerase activity. Combination of a BHAP with nucleoside analog HIV-1 RT inhibitors suggested that together these compounds inhibited RT synergistically. In three human lymphocytic cell systems using several laboratory and clinical HIV-1 isolates, the BHAPs blocked HIV-1 replication with potencies nearly identical to those of 3'-azido-2',3'-dideoxythymidine or 2',3'-dideoxyadenosine; in primary cultures of human peripheral blood mononuclear cells, concentrations of these antiviral agents were lower by at least 3-4 orders of magnitude than cytotoxic levels. The BHAPs do not inhibit replication of HIV-2, the simian or feline immunodeficiency virus, or Rauscher murine leukemia virus in culture. Evaluation of a BHAP in HIV-1-infected SCID-hu mice (severe combined immunodeficient mice implanted with human fetal lymph node) showed that the compound could block HIV-1 replication in vivo. The BHAPs are readily obtained synthetically and have been extensively characterized in preclinical evaluations. These compounds hold promise for the treatment of HIV-1 infection.

Nonnucleoside reverse transcriptase inhibitors that potently and specifically block human immunodeficiency virus type 1 replication.