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  • Title: Human immunodeficiency virus type 1 (HIV-1) tat-protein stimulates the production of interleukin-6 (IL-6) by peripheral blood monocytes.
    Author: Zauli G, Furlini G, Re MC, Milani D, Capitani S, La Placa M.
    Journal: New Microbiol; 1993 Apr; 16(2):115-20. PubMed ID: 8510564.
    Abstract:
    In this study we evaluated the effect of human immunodeficiency virus type 1 (HIV-1) recombinant tat-protein on the production of interleukin-6 (IL-6), granulocyte/macrophage colony stimulating factor (GM-CSF) and tumor necrosis factor-alpha (TNF-alpha) by purified peripheral blood monocytes. Whereas no effects were observed on TNF-alpha and GM-CSF production, recombinant tat-protein was able to induce the production of IL-6 by peripheral blood monocytes in a dose-dependent fashion for concentrations ranging from 1 ng/ml to 1 micrograms/ml. Pre-exposure of tat-protein with a polyclonal neutralizing anti-tat antibody (dilution 1:100) completely abrogated the tat-dependent increase in IL-6 production. The ability of tat-protein to selectively stimulate the production of IL-6 by peripheral blood monocytes could help to explain the presence of elevated levels of IL-6 in the serum of HIV-1 seropositive individuals, especially in patients in advanced stages of the disease with an active viral replication.
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