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- W2078192536 abstract "Effects of recombinant murine interferon-gamma (rIFN-gamma) on the membrane adenylate cyclase of a murine macrophage cell line (P388D1) were investigated in order to explore the nature of a signal transmitted by IFN-gamma receptor. Following the incubation of P388D1 cells with 40 U/ml of rIFN-gamma, the intracellular level of cAMP gradually increased about twofold over the control level within 60 min, and then began to gradually decline to about half the control level by 24 h incubation. The initial rise in cAMP level appeared to be due to the modest activation of adenylate cyclase and not due to the inhibition of cAMP-phosphodiesterase. Later decrease of intracellular cAMP may be due to quantitative down-regulation of the adenylate cyclase system. The basal enzymatic activity of the membrane prepared from P388D1 cells exposed to IFN-gamma for 24 h was found to be reduced to about 20% of that of the control membrane. However, the quality of the adenylate cyclase system appeared unchanged, because the relative degree of the response of the down-regulated membrane adenylate cyclase to prostaglandin PGE2, NaF, guanylimidodiphosphate (GppNHp), choleara toxin (CT), or forskolin was found to remain unchanged. This quantitative down-regulation of adenylate cyclase must be due to the action of rIFN-gamma, since the prior treatment of rIFN-gamma with either acid (pH 2) or monoclonal anti-IFN-gamma antibody inhibited the ability of IFN-gamma to induce the down-regulation. The rIFN-gamma-induced down-regulation is a reversible process, since the adenylate cyclase activity of the membrane was found to be restored when the rIFN-gamma-exposed cells were cultured for 72 h in the absence of rIFN-gamma. In addition, the 48 h-incubation of P388D1 cells with rIFN-beta or IFN-alpha was found not to significantly affect the membrane adenylate cyclase system." @default.
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- W2078192536 title "Interferon-γ down-regulates membrane adenylate cyclase activity of a murine macrophage-like cell line (P388D1)" @default.
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- W2078192536 doi "https://doi.org/10.1016/1043-4666(89)91046-6" @default.
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