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• W2001079294 abstract "Regulation of histamine release was studied mainly on brain slices prelabeled withl-[3-H]histidine and depolarized by increased extracellular K+ concentration or veratridine in a non-superfused system. The released3H-labeled amines, isolated by ion-exchange chromatography from a large excess of3H-labeled precursor consisted by more than 95% of unchanged [3H]histamine. Exogenous histamine reduced the release of neosynthesized [3H]histamine via stimulation of previously characterized H3-receptors whereas it did not modify the3H-labeled amine release from slices prelabeled with preformed [3H]histamine. The maximal inhibitory effect of exogenous histamine progressively diminished as the strength of the depolarizing stimulus or the external Ca2+ concentration were elevated. On the contrary H3-receptor antagonists like impromidine or burimamide enhanced the depolarization-induced release of [3H]histamine, an effect which was particularly marked when slices were loaded with histamine by preincubation with [3H]histidine in high concentration. These results suggest that the inhibition of [3H]histamine release by exogenous histamine acting via H3-receptor stimulation is mediated by a restricted access of Ca2+ and that its extent is influenced by the degree of autostimulation by endogenous histamine as well as, possibly, by actual internal Ca2+ concentration. In addition the decrease in external Ca2+ concentration shifted rightwards the concentration-response curve to histamine. The autoinhibitory effect of exogenous histamine was found on slices from various regions, known from lesion studies to contain terminals of extrinsic histaminergic neurons. It did not apparently involve interneurones, not being prevented in slices in which the traffic of action potentials was blocked by tetrodotoxin. It also remained unaffected in striatal slices in which the neuronal cell-bodies were selectively destroyed by prior local infusion of kainic acid. Finally exogenous histamine inhibited [3H]histamine release from depolarized synaptosomes of rat cerebral cortex, with anEC50 value similar to that found with slices and was antagonised by impromidine with an apparentKi value similar to that displayed at H3-receptors. It is concluded that histamine modulates its own release from cerebral neurones by interacting with H3-presynaptic autoreceptors and via mechanisms similar to those previously evidenced on other aminergic systems." @default.
• W2001079294 created "2016-06-24" @default.
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• W2001079294 date "1985-06-01" @default.
• W2001079294 modified "2023-09-27" @default.
• W2001079294 title "Autoregulation of histamine release in brain by presynaptic H3-receptors" @default.
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• W2001079294 doi "https://doi.org/10.1016/0306-4522(85)90233-7" @default.
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