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- W1970022105 abstract "Tumor necrosis factor alpha (TNF-alpha) and 12-0-tetradecanoyl phorbol-13-acetate (TPA) activate human immunodeficiency virus type 1 (HIV-1) in U1 cells that are latently infected with HIV-1 to produce viral particles. Pertussis toxin, which inactivates several members of the G protein family of signaling components, including Gi, Go, and transducin, was found to inhibit either TPA or TNF-alpha induction of HIV-1 in U1 cells at the concentration of 1-10 ng/ml. Chloramphenicol acetyl transferase (CAT) assay revealed that pertussis toxin could inhibit HIV-1 gene expression. B-oligomer, the mitogenic and non-ADP-ribosylating component of pertussis toxin, did not show any effect on HIV-1 replication alone or in combination with TNF in the same concentration range. It was of particular interest to note that a single protein (Gi) with a molecular weight of 40 kDa was dose-dependently ADP-ribosylated after treatment with pertussis toxin in U1 cells. The degree of ADP ribosylation of Gi corresponded well to that of inhibition of HIV-1 upon treatment with pertussis toxin. These results strongly support the contention that TPA and TNF-alpha induction of HIV-1 is mediated by a Gi-like receptor-effector coupling protein in the membrane of U1 cells. On the basis of these findings, we propose a model for signal transduction of HIV-1 expression through c-kinase-dependent (TPA) and c-kinase-independent (TNF-alpha) pathways in the U1 cell to determine the point at which Gi-like protein is involved." @default.
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- W1970022105 date "1994-09-01" @default.
- W1970022105 modified "2023-10-16" @default.
- W1970022105 title "Pertussis Toxin Inhibits Induction of Human Immunodeficiency Virus Type 1 in Infected Monocytes" @default.
- W1970022105 doi "https://doi.org/10.1006/viro.1994.1497" @default.
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