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The effect of extracellular domain of human immunodeficiency virus (HIV-1) transmembrane glycoprotein gp41 on interleukin (IL)-10, IL-2, interferon (IFN)-y, IL-4, and tumor necrosis factor-alpha production by human peripheral blood mononuclear cells (PBMC) was assessed by ELISA. Rapid gp41-induced increase of IL-10 production was detected in resting PBMC and isolated monocytes but not in B, T, or NK cells. Furthermore, gp41 also enhanced IL-10 production in staphylococcal enterotoxin B-stimulated PBMC, while synthesis of IL-2, IFN-gamma, and IL-4 in these cells was down-modulated. Kinetic studies revealed that increased IL-10 production preceded reduction of IL-2, indicating the possible IL-10 regulatory role in the gp41-induced down-modulation of this cytokine. Anti-IL-10 antibody reversed almost completely the gp41 inhibitory effect on IL-2 production. In this study, HIV-1 gp41 was a potent modulator of cytokine production by PBMC, in particular by increasing IL-10 secretion from normal monocytes/macrophages and consequently down-regulating IL-2 and IFN-gamma.

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

gp41 Envelope Protein of Human Immunodeficiency Virus Induces Interleukin (IL)-10 in Monocytes, but Not in B, T, or NK Cells, Leading to Reduced IL-2 and Interferon- Production