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• W2022762204 startingPage "705" @default.
• W2022762204 abstract "Adenosine triphosphate (ATP) has been reported to enhance the release of glutamate by acting at P2X presynaptic receptors. Acetylcholine (ACh) can elicit glutamate release through presynaptic nicotinic cholinergic receptors (nAChRs) of the alpha7 subtype situated on glutamatergic axon terminals, provided that the terminal membrane is weakly depolarized. Considering that ATP and ACh are co-transmitters, we here investigate on the possibility that P2X and nAChRs co-exist and interact on the same glutamatergic nerve endings using purified rat neocortex synaptosomes in superfusion. ATP evoked Ca(2+)-dependent release of pre-accumulated D-[(3)H]aspartate ([(3)H]D-ASP) as well as of endogenous glutamate; (-)-nicotine, inactive on its own, potentiated the ATP-evoked release. The ATP analogue benzoylbenzoylATP (BzATP) behaved like ATP, but was approximately 30 times more potent; the potentiation of the BzATP-evoked release was blocked by methyllycaconitine or alpha-bungarotoxin. Adding inactive concentrations of (-)-nicotine, epibatidine or choline together with inactive concentrations of BzATP resulted in significant elevation of the [(3)H]D-ASP release mediated by alpha7 nAChRs. To conclude, P2X(7) receptors and alpha7 nAChRs seem to co-exist and interact on rat neocortex glutamatergic terminals; in particular, P2X(7) receptors exert a permissive role on the activation of alpha7 nAChRs, suggesting that ATP may not only evoke glutamate release on its own, but may also regulate the release of the amino acid elicited by ACh." @default.
• W2022762204 created "2016-06-24" @default.
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• W2022762204 date "2006-05-01" @default.
• W2022762204 modified "2023-10-01" @default.
• W2022762204 title "P2X7 receptors exert a permissive role on the activation of release-enhancing presynaptic α7 nicotinic receptors co-existing on rat neocortex glutamatergic terminals" @default.
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• W2022762204 doi "https://doi.org/10.1016/j.neuropharm.2005.11.016" @default.
• W2022762204 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/16427662" @default.
• W2022762204 hasPublicationYear "2006" @default.
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