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HERO ID
7669608
Reference Type
Journal Article
Title
The role of adenosine A2a receptors in regulating GABAergic synaptic transmission in striatal medium spiny neurons
Author(s)
Mori, A; Shindou, T; Ichimura, M; Nonaka, H; Kase, H
Year
1996
Is Peer Reviewed?
Yes
Journal
Journal of Neuroscience
ISSN:
0270-6474
EISSN:
1529-2401
Publisher
Society for Neuroscience
Volume
16
Issue
2
Page Numbers
605-611
Language
English
PMID
8551344
DOI
10.1523/jneurosci.16-02-00605.1996
Web of Science Id
WOS:A1996TP51900018
Abstract
We demonstrated an adenosine A2a receptor-mediated disinhibition of medium spiny projection neurons using intracellular recording and the whole-cell patch-clamp recording applied to these cells, visually identified in thin rat striatal slices. The A2a receptor agonist 2-[p-(2-carboxyethyl) phenylethylamino]-5'-N- ethylcarboxamido adenosine (CGS-21680; 0.3-10 microM) suppressed GABAergic synaptic transmission onto these cells in a manner inhibited by the A2a receptor-selective antagonist (E)-8-(3,4-dimethoxystyryl)-1,3-dipropyl-7-methylxanthine (0.1-1.0 microM). The A1 receptor antagonists had no effect on the CGS-21680-induced suppression. Analysis of spontaneous miniature inhibitory synaptic currents indicated that suppression of intrastriatal GABAergic synaptic transmission was attributable to presynaptic, but not postsynaptic, A2a receptors. Therefore, the A2a receptor may regulate striatal output activity by relieving GABA-mediated inhibition of the medium spiny projection neurons, which explains the ability of purinergic agents to affect motor control.
Keywords
adenosine; adenosine receptor; GABA; striatum; CGS-21680; KF17837; IPSP; IPSC; cAMP
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