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Interleukin 6 (IL-6) has been reported to upregulate the expression of human immunodeficiency virus type 1 (HIV-1) in infected monocyte/macrophages. Since IL-6 signal is transduced through the membrane glycoprotein gp130, we investigated the inhibitory effect of anti-gp130 monoclonal antibody (mAb) on IL-6-induced viral expression in monocytic cell lines latently infected with HIV-1. IL-6 significantly induced the expression of HIV-1 in U1 cells, whereas it had no effect in OM-10.1 cells. Flow cytometric analysis revealed that U1 but not OM-10.1 cells expressed gp130 on their surface. The anti-gp130 mAb could inhibit IL-6-induced HIV-1 expression in U1 cells in a dose dependent fashion. These results suggest that blocking the gp130 signal transduction may have therapeutic potential for the treatment of HIV-1 infection.
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