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- W2058965679 abstract "Recent evidence supports a role for transient c-fos expression as one step in signalling pathways by which membrane receptor-ligand interactions are transduced into appropriate intracellular responses. The activity of adrenergic receptors is mediated by second messenger systems which include ion fluxes, changes in cAMP concentration and enhanced phosphoinositide turnover. In order to determine if C-fos induction was also a step in adrenergic signal transduction in the brain, we performed in vivo studies with drugs specific for different adrenergic receptor types. Unexpectedly, we found that the stress associated with a single intraperitoneal (i.p.) injection of drug vehicle produced a transient increase (averaging 4.0-fold) in c-fos mRNA levels in rat brain. Injection of the alpha 2-adrenoreceptor antagonist, yohimbine, produced a transient increase which was larger in magnitude (averaging 9.6-fold) and longer in duration than that produced by injection of the drug vehicle alone. In experiments designed to ask whether either of these inductions was mediated by specific types of adrenergic receptors, we found that the alpha 2- and beta-adrenoreceptors were involved in both responses, while the alpha 1-receptor played a role in mediating the yohimbine induction, but no detectable role in the solvent induction. One hypothesis consistent with our results is that the norepinephrine (NE) released due to the stress associated with an i.p. injection interacts with postsynaptic beta-adrenergic receptors, resulting in the observed c-fos mRNA induction. When the negative feedback effect of NE, mediated by presynaptic alpha 2-receptors, is blocked by yohimbine, the postsynaptic response is enhanced and prolonged." @default.
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- W2058965679 date "1989-07-01" @default.
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- W2058965679 title "Adrenergic receptors mediate changes in c-fos mRNA levels in brain" @default.
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- W2058965679 doi "https://doi.org/10.1016/0169-328x(89)90026-0" @default.
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