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- W2040936181 abstract "Repeated applications of elevated K+ (100 mM) in artificial cerebrospinal fluid (CSF) were used to evoke an efflux of acetylcholine (ACh) from the in vivo rat cerebral cortex using a cortical cup technique. Elevated K+ reproducibly increased the levels of ACh in cup superfusates by a factor of 3-5-fold above basal levels (27.2 +/- 9.7 nM). The adenosine A1 receptor agonist N6-cyclopentyl adenosine (CPA), at a concentration of 10(-8) M, depressed basal, but not K(+)-evoked ACh efflux. 10(-6) M CPA increased basal, but did not alter K(+)-evoked, ACh efflux. The A2 selective agonist CGS 21680 did not alter either basal, or K(+)-evoked, ACh efflux. The inhibitory effects of 10(-8) M CPA on ACh efflux would be consistent with the presence of adenosine A1 receptors on cholinergic nerve terminals in the cerebral cortex. At a higher concentration (10(-6) M) CPA elevated basal release, possibly by activating low affinity A2 receptors. The failure of CGS 21680 (10(-8) M) to alter basal ACh release suggests an absence of high affinity A2 receptors in these terminals. Whereas elevated K+ in cup superfusates consistently enhanced ACh efflux from the cerebral cortex, this increase was not affected by either CPA or CGS 21680. High K(+)-evoked release of cerebral cortical ACh may be an inappropriate model for the study of adenosine's actions on neurotransmitter release." @default.
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- W2040936181 title "Effect of adenosine receptor agonists on spontaneous and K+-evoked acetylcholine release from the in vivo rat cerebral cortex" @default.
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- W2040936181 doi "https://doi.org/10.1016/0006-8993(93)91753-f" @default.
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