Adenosine Transporter ENT1 Regulates the Acquisition of Goal-directed Behavior and Ethanol Drinking Through A2A Receptor in the Dorsomedial Striatum

Overview

Journal J Neurosci

Specialty Neurology

Date 2013 Mar 8

PMID 23467349

Citations 62

Authors

Hyung Wook Nam

David J Hinton

Na Young Kang

Taehyun Kim

Moonnoh R Lee

Alfredo Oliveros

Chelsea Adams

Christina L Ruby

Doo-Sup Choi

Affiliations

Soon will be listed here.

Abstract

Adenosine signaling has been implicated in the pathophysiology of many psychiatric disorders including alcoholism. Striatal adenosine A2A receptors (A2AR) play an essential role in both ethanol drinking and the shift from goal-directed action to habitual behavior. However, direct evidence for a role of striatal A2AR signaling in ethanol drinking and habit development has not been established. In the present study, we found that decreased A2AR-mediated CREB activity in the dorsomedial striatum (DMS) enhanced initial behavioral acquisition of goal-directed behaviors and the vulnerability to progress to excessive ethanol drinking during operant conditioning in mice lacking ethanol-sensitive adenosine transporter ENT1 (ENT1(-/-)). Using mice expressing β-galactosidase (lacZ) under the control of seven repeated CRE sites in both genotypes (CRE-lacZ/ENT1(+/+) mice and CRE-lacZ/ENT1(-/-) mice) and the dominant-negative form of CREB, we found that reduced CREB activity in the DMS was causally associated with decreased A2AR signaling and increased goal-directed ethanol drinking. Finally, we have demonstrated that the A2AR antagonist ZM241385 dampened protein kinase A activity-mediated signaling in the DMS and promoted excessive ethanol drinking in ENT1(+/+) mice, but not in ENT1(-/-) mice. Our results indicate that A2AR-mediated CREB signaling in the DMS is a key determinant in enhancing the development of goal-directed ethanol drinking in mice.

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