Volume 1003, Issue 1 p. 226-240

Plastic Control of Striatal Glutamatergic Transmission by Ensemble Actions of Several Neurotransmitters and Targets for Drugs of Abuse

DAVID M. LOVINGER

Corresponding Author

DAVID M. LOVINGER

Laboratory for Integrative Neuroscience, Division of Intramural Clinical and Basic Research, National Institute on Alcohol Abuse and Alcoholism, National Institutes of Health, Rockville, Maryland 20852, USA

Address for correspondence: Dr. David M. Lovinger, National Institute on Alcohol Abuse and Alcoholism, Rockville, MD 20852. Voice: 301-443-2445; fax: 301-480-1734. [email protected]Search for more papers by this author
JOHN G. PARTRIDGE

JOHN G. PARTRIDGE

Laboratory of Molecular Physiology, Division of Intramural Clinical and Basic Research, National Institute on Alcohol Abuse and Alcoholism, National Institutes of Health, Rockville, Maryland 20852, USA

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KA-CHOI TANG

KA-CHOI TANG

Ernest Gallo Clinic and Research Center, and the Department of Neurology, University of California at San Francisco, Emeryville, California 94608, USA

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First published: 24 January 2006
Citations: 62

Abstract

Abstract: Long-lasting alterations in the efficacy of glutamatergic synapses, such as long-term potentiation (LTP) and long-term depression (LTD), are prominent models for mechanisms of information storage in the brain. It has been suggested that exposure to drugs of abuse produces synaptic plasticity at glutamatergic synapses that shares many features with LTP and LTD, and that these synaptic changes may play roles in addiction. We have examined the involvement of particular neurotransmitters in synaptic plasticity at glutamatergic synapses within the striatum, a brain region with prominent roles in initiation and sequencing of actions, as well as habit formation. Our studies indicate that multiple neurotransmitters interact to produce striatal synaptic plasticity, and that the relative strength and patterning of the afferent inputs that release the various neurotransmitters determines whether LTP or LTD is activated. Drugs of abuse interact with glutamatergic synaptic plasticity in multiple ways, including alterations in dopamine release and more direct effects on glutamate release and glutamate receptors. We hypothesize that these effects contribute to addiction by facilitating the formation of new, drug-centered habits, and by disruption of more adaptive behaviors.