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- W2052562178 abstract "In slices of the rat hippocampus, alpha 2-adrenoceptors located presynaptically on serotonergic nerve terminals modulate the electrically evoked calcium-dependent release of [3H]serotonin [( 3H]5HT). We have investigated the effects of a naturally occurring trace amine, beta-phenylethylamine (beta-PEA), on noradrenergic transmission in the rat hippocampus. Under experimental conditions in which MAO of type B is inhibited by deprenyl-exposure to beta-PEA (0.1-10 microM) facilitates the spontaneous outflow of [3H]noradrenaline and inhibits the electrically evoked release of [3H]5HT. The inhibitory effect of beta-PEA (3 microM) on the evoked release of [3H]5HT was antagonized by the alpha 2-adrenoceptor antagonist idazoxan at 1 microM, and by pretreatment with alpha-methyl-p-tyrosine (alpha-MpT, 300 mg/kg i.p., 2 h). The inhibition of tyrosine hydroxylase activity by alpha-MpT does not modify the inhibition of the evoked release of [3H]5HT by the alpha 2-adrenoceptor agonist, 6-fluoronoradrenaline, or the serotonin receptor agonist, 5-methoxytryptamine. Pretreatment with the neurotoxin DSP4 (50 mg/kg i.p., 10 days) markedly antagonized the inhibitory action of beta-PEA on [3H]5HT release. These results indicate that the noradrenaline-releasing action of beta-PEA inhibits the electrically evoked release of [3H]5HT through the activation of alpha 2-adrenoceptors. This inhibitory effect appears to be mediated exclusively through the release of newly synthesized noradrenaline, and does not involve the direct activation by beta-PEA of the inhibitory 5HT autoreceptors which modulate [3H]5HT release in the rat hippocampus." @default.
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- W2052562178 date "1986-11-01" @default.
- W2052562178 modified "2023-09-25" @default.
- W2052562178 title "Newly synthesized noradrenaline mediates the α2-adrenoceptor inhibition of [3H]5-hydroxytryptamine release induced by β-phenylethylamine in rat hippocampal slices" @default.
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- W2052562178 doi "https://doi.org/10.1016/0014-2999(86)90572-8" @default.
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