Linked Life Data

2981280

Source:http://linkedlifedata.com/resource/pubmed/id/2981280

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pubmed-article:2981280pubmed:abstractTextThe activation by endogenous dopamine of the inhibitory 3,4-dihydroxyphenylethylamine (dopamine) receptors modulating the electrically evoked release of [3H]acetylcholine [( 3H]ACh) and [3H]dopamine in rat striatal slices is a function of the concentration of dopamine accumulated in the synaptic cleft during electrical stimulation. When the release of 3H-neurotransmitters was elicited with a 2-min period of stimulation at a frequency of 1 Hz, neither dopamine autoreceptors nor dopamine receptors modulating [3H]ACh were activated by endogenously released dopamine. On the other hand, exposure to (S)-sulpiride facilitated the release of [3H]dopamine and [3H]ACh elicited when the 2-min stimulation was carried out at a frequency of 3 Hz but this effect was not observed at a lower frequency of stimulation (1 Hz). In the presence of amphetamine the dopamine receptors modulating the electrically evoked release of [3H]ACh can be activated by endogenous dopamine even at the lower frequency of stimulation (1 Hz). Similar effects can be obtained if the neuronal uptake of dopamine is inhibited by cocaine or nomifensine. The inhibition by amphetamine of the release of [3H]ACh elicited by electrical stimulation at 1 Hz involves dopamine receptors and can be fully antagonized by clozapine, haloperidol, chlorpromazine, or pimozide. The stereoselectivity of this antagonism can be demonstrated with the optical enantiomers of sulpiride and butaclamol. This inhibitory effect of amphetamine on cholinergic neurotransmission appears to be the result of the stimulation of dopamine receptors of the D2 subtype, as they were resistant to blockade by the preferential D1 receptor antagonist SCH 23390.(ABSTRACT TRUNCATED AT 250 WORDS)lld:pubmed
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pubmed-article:2981280pubmed:articleTitleInhibition of the electrically evoked release of [3H]acetylcholine in rat striatal slices: an experimental model for drugs that enhance dopaminergic neurotransmission.lld:pubmed
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