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Author Notes:

Correspondence: Dr. Yoland Smith, Yerkes National Primate Research Center, Emory University, 954 Gatewood Rd. NE, Atlanta, GA 30329; Email: ysmit01@emory.edu

Acknowledgments: The authors would like to thank Susan Jenkins and Jean-Francois Pare for their valuable technical assistance.

Subjects:

Research Funding:

This work was supported by NIH grants RR 00165 to the Yerkes National Primate Research Center, R01NS037423 to YS and 5F31DA020301-02 to DM.

Keywords:

  • immunogold
  • mGluR1a
  • mGluR5
  • nucleus accumbens
  • cocaine
  • DHPG

Subcellular and subsynaptic localization of group I metabotropic glutamate receptors in the nucleus accumbens of cocaine-treated rats

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Journal Title:

Neuroscience

Volume:

Volume 154, Number 2

Publisher:

, Pages 653-666

Type of Work:

Article | Post-print: After Peer Review

Abstract:

There is significant pharmacological and behavioral evidence that group I metabotropic glutamate receptors (mGluR1a and mGluR5) in the nucleus accumbens play an important role in the neurochemical and pathophysiological mechanisms that underlie addiction to psychostimulants. To further address this issue, we undertook a detailed ultrastructural analysis to characterize changes in the subcellular and subsynaptic localization of mGluR1a and mGluR5 in the core and shell of nucleus accumbens following acute or chronic cocaine administration in rats. After a single cocaine injection (30mg/kg) and 45 minutes withdrawal, there was a significant decrease in the proportion of plasma membrane-bound mGluR1a in accumbens shell dendrites. Similarly, the proportion of plasma membrane-bound mGluR1a was decreased in large dendrites of accumbens core neurons following chronic cocaine exposure (i.e. 1 week treatment followed by three weeks withdrawal). However, neither acute nor chronic cocaine treatments induced significant change in the localization of mGluR5 in accumbens core and shell, which is in contrast with the significant reduction of plasma membrane-bound mGluR1a and mGluR5 induced by local intra-accumbens administration of the group I mGluR agonist, DHPG. In conclusion, these findings demonstrate that cocaine-induced glutamate imbalance (Smith et al., 1995; Pierce et al., 1996; Reid et al., 1997) has modest effects on the trafficking of group I mGluRs in the nucleus accumbens. These results provide valuable information on the neuroadaptive mechanisms of accumbens group I mGluRs in response to cocaine administration.

Copyright information:

© 2008 IBRO. Published by Elsevier Ltd. All rights reserved.

This is an Open Access work distributed under the terms of the Creative Commons Attribution-NonCommerical-NoDerivs 3.0 Unported License (http://creativecommons.org/licenses/by-nc-nd/3.0/).

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