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In vitro interactions between interleukin (IL)-12, interferon (IFN)-gamma, and human immunodeficiency virus (HIV) type 1 infection in human macrophages were examined. Macrophages were infected with HIV-1 and cocultured with autologous monocyte-depleted peripheral blood mononuclear cells (PBMC). The addition of autologous PBMC to HIV-1-infected macrophages resulted in an expansive increase in reverse transcriptase (RT) activity; however, when both autologous PBMC and IL-12 were added, RT activity decreased (75%-90%) and high levels of IFN-gamma (9-16 ng/mL) were detected. The addition of anti-IFN-gamma antibodies blocked the IL-12-induced decrease in RT activity. Surprisingly, exogenous IL-12 added to HIV-infected macrophage cultures without autologous lymphocytes resulted in a 50%-60% reduction in RT activity and no detectable increase in IFN-gamma. The addition of anti-IFN-gamma did not inhibit this IL-12-mediated effect. These results suggest that IL-12 is capable of indirectly down-regulating HIV proliferation in macrophage cultures reconstituted with autologous PBMC and of directly suppressing HIV replication in purified macrophage cultures.

the journal of infectious diseases (online. university of chicago press)/the journal of infectious diseases

Interleukin-12 Decreases Human Immunodeficiency Virus Type 1 Replication in Human Macrophage Cultures Reconstituted with Autologous Peripheral Blood Mononuclear Cells