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• W1695830319 abstract "The post-receptor events which follow the binding of interleukin 1 (IL1) to cells are unclear. The present studies provide evidence for the activation of a guanine nucleotide binding protein (G protein) by IL1 in the membranes of an IL1 receptor-rich strain (NOB-1) of the EL4 murine thymoma line. IL1 alpha and beta increased the binding of the GTP analogue [35S]guanosine 5'-[gamma-thiol]trisphosphate (GTP gamma S) to membranes prepared from these cells. By 1 min after addition of IL1 there was a 2-fold enhancement in binding which was dose dependent in the range 0.1-100 ng/ml. A qualitatively similar result was obtained with IL1 beta although it was 10 times less potent. Specific neutralizing antisera to IL1 alpha and IL1 beta abolished the response. Experiments in which the concentration of [35S]GTP gamma S was varied revealed that IL1 increased the affinity of the binding sites for [35S]GTP gamma S and not their number. IL1 alpha was shown to stimulate GTPase activity in the membranes, the time and concentration dependence of this was similar to that observed for increased [35S]GTP gamma S binding. Half-maximal enhancement of [35S]GTP gamma S binding by IL1 alpha, measured after 4 min, occurred at 5% IL1 receptor occupancy. Maximal stimulation was achieved when 30% of receptors were occupied. Experiments with pertussis and cholera toxins revealed that pretreating membranes with pertussis toxin (100 ng/ml) inhibited by 50% the IL1-induced [35S]GTP gamma S binding and [gamma-32P]GTP hydrolysis. Cholera toxin (100 ng/ml) was without effect. However, both pertussis and cholera toxins at concentrations of 100 ng/ml inhibited IL1-induced IL2 secretion in EL4 NOB-1 cells. These results show that the IL1 receptor of a responsive thymoma line activates, and may be coupled to, a G protein(s). This is a possible mechanism of IL1 signal transduction." @default.
• W1695830319 created "2016-06-24" @default.
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• W1695830319 date "1990-02-01" @default.
• W1695830319 modified "2023-10-18" @default.
• W1695830319 title "Interleukin-1 signal transduction. Increased GTP binding and hydrolysis in membranes of a murine thymoma line (EL4)." @default.
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• W1695830319 doi "https://doi.org/10.1016/s0021-9258(19)39746-7" @default.
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