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- W1996734832 abstract "In superfused rat hypothalamic slices prelabeled with [3H]-5-hydroxytryptamine ([3H]-5-HT), the 5-HT autoreceptor agonists 5-methoxytryptamine and RU 24969 inhibited in a concentration-dependent manner the electrically evoked release of [3H]-5-HT. Exposure to phorbol-12,13-dibutyrate increased in a concentration-dependent manner the stimulation-evoked overflow of [3H]-5-HT and shifted to the right the 5-methoxytryptamine inhibition curve. Exposure to forskolin, a potent activator of adenylate cyclase, increased the stimulation-evoked [3H]-5-HT overflow and shifted to the left the 5-methoxytryptamine or RU 24969 inhibitory curves on transmitter release. A similar interaction was observed in the presence of 1-isobutyl,3-methylxanthine (IBMX), a phosphodiesterase inhibitor, or 8-bromo-cyclic AMP and the serotonin autoreceptor agonist 5-methoxytryptamine. In the presence of phorbol-12,13-dibutyrate or forskolin, the enhancing effect of the 5-HT autoreceptor antagonist methiothepin on the stimulation-evoked [3H]-5-HT overflow was significantly less pronounced than in the absence of these compounds. These results indicate that the presynaptic 5-HT autoreceptors that modulate the release of [3H]-5-HT in rat hypothalamic slices may be coupled to the phosphoinositide cycle and protein kinase C-dependent mechanisms. In addition, the increase in intracellular level of cyclic AMP by forskolin, IBMX, and 8-bromo-cyclic AMP potentiates the inhibitory effects of the autoreceptor agonist 5-methoxytryptamine on [3H]-5-HT release, although the mechanism of the interaction remains to be elucidated." @default.
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- W1996734832 title "Phorbol-12,13-dibutyrate antagonizes while forskolin potentiates the presynaptic autoreceptor-mediated inhibition of [3H]-5-hydroxytryptamine release in rat hypothalamic slices" @default.
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- W1996734832 doi "https://doi.org/10.1002/syn.890030302" @default.
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