Abstract
Tumor necrosis factor alpha (TNF-alpha) is expressed in secreted and cell surface (csTNF-alpha) forms by activated monocytic and T cells. In this report, we demonstrate that csTNF-alpha may predominantly regulate the human immunodeficiency virus type 1 (HIV-1) long terminal repeat (LTR) activation in the promonocytic cell line U937 and in the Epstein-Barr virus-transformed B-cell line BH1. Anti-TNF-alpha antibody suppressed both the constitutive expression of the HIV-1 LTR in BH1 cells and the expression induced by phorbol 12-myristate 13-acetate in U937 cells. This suppression was found to be mediated via csTNF-alpha. No correlation between the HIV-1 LTR activation and the secretion of TNF-alpha was evident in these cell lines. Suppression of TNF-alpha secretion by cyclosporin A or by a serine protease inhibitor did not suppress the HIV-1 LTR activation. These observations suggest a novel biological role for csTNF-alpha in the immunopathogenesis of AIDS.
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Selected References
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