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Adenosine A2a Receptor Modulation of Electrically Evoked Endogenous GABA Release from Slices of Rat Globus Pallidus

Adenosine A2a Receptor Modulation of Electrically Evoked Endogenous GABA Release from Slices of... Abstract: Adenosine A2a receptors have been localized to GABAergic striatopallidal neurons, but their functional role is unknown. To address this question, the modulation of endogenous GABA release by adenosine A2a receptors was examined in slices of rat globus pallidus. The selective adenosine A2a receptor agonist CGS‐21680 (3.0–10 nM) significantly increased electrically stimulated release (overflow) of GABA, with 10 nM CGS‐21680 resulting in a 44% increase compared with the control. Both the nonselective adenosine receptor antagonist 8‐phenyltheophylline (10 μM) and the selective A2a receptor antagonist KF‐17837 (100 nM) abolished the CGS‐21680‐induced increase in GABA overflow. Higher concentrations of CGS‐21680 (0.10–1.0 μM) decreased GABA overflow by ˜25%.8‐Phenyltheophylline (10 μM) antagonized these effects, whereas KF‐17837 (100 nM) did not, suggesting actions of CGS‐21680 on other adenosine receptors at these concentrations. These results demonstrate that activation of adenosine A2a receptors augments electrically stimulated release of GABA from globus pallidus slices and suggest a mechanism by which adenosine may modulate GABAergic output from the striatopallidal efferent system. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Journal of Neurochemistry Wiley

Adenosine A2a Receptor Modulation of Electrically Evoked Endogenous GABA Release from Slices of Rat Globus Pallidus

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References (22)

Publisher
Wiley
Copyright
Copyright © 1993 Wiley Subscription Services
ISSN
0022-3042
eISSN
1471-4159
DOI
10.1111/j.1471-4159.1993.tb03526.x
Publisher site
See Article on Publisher Site

Abstract

Abstract: Adenosine A2a receptors have been localized to GABAergic striatopallidal neurons, but their functional role is unknown. To address this question, the modulation of endogenous GABA release by adenosine A2a receptors was examined in slices of rat globus pallidus. The selective adenosine A2a receptor agonist CGS‐21680 (3.0–10 nM) significantly increased electrically stimulated release (overflow) of GABA, with 10 nM CGS‐21680 resulting in a 44% increase compared with the control. Both the nonselective adenosine receptor antagonist 8‐phenyltheophylline (10 μM) and the selective A2a receptor antagonist KF‐17837 (100 nM) abolished the CGS‐21680‐induced increase in GABA overflow. Higher concentrations of CGS‐21680 (0.10–1.0 μM) decreased GABA overflow by ˜25%.8‐Phenyltheophylline (10 μM) antagonized these effects, whereas KF‐17837 (100 nM) did not, suggesting actions of CGS‐21680 on other adenosine receptors at these concentrations. These results demonstrate that activation of adenosine A2a receptors augments electrically stimulated release of GABA from globus pallidus slices and suggest a mechanism by which adenosine may modulate GABAergic output from the striatopallidal efferent system.

Journal

Journal of NeurochemistryWiley

Published: Jan 1, 1993

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