Abstract
Sigma1 receptors (σ1Rs) are intracellularly mobile chaperone proteins implicated in several disease processes, as well as psychiatric disorders and substance abuse. Here we report that although selective σ1R agonists (PRE-084, (+)-pentazocine) lacked reinforcing effects in drug-naive rats, over the course of 28 experimental sessions, which was more than sufficient for acquisition of cocaine self-administration, responding was not maintained by either σ1R agonist. In contrast, after subjects self-administered cocaine σ1R agonists were readily self-administered. The induced reinforcing effects were long lasting; a response for which subjects had no history of reinforcement was newly conditioned with both σ1R agonists, extinguished when injections were discontinued, and reconditioned when σ1R agonists again followed responses. Experience with food reinforcement was ineffective as an inducer of σ1R agonist reinforcement. Although a variety of dopamine receptor antagonists blocked cocaine self-administration, consistent with its dopaminergic mechanism, PRE-084 self-administration was entirely insensitive to these drugs. Conversely, the σR antagonist, BD1063, blocked PRE-084 self-administration but was inactive against cocaine. In microdialysis studies i.v. PRE-084 did not significantly stimulate dopamine at doses that were self-administered in rats either with or without a cocaine self-administration experience. The results indicate that cocaine experience induces reinforcing effects of previously inactive σ1R agonists, and that the mechanism underlying these reinforcing effects is dopamine independent. It is further suggested that induced σ1R mechanisms may have an essential role in treatment-resistant stimulant abuse, suggesting new approaches for the development of effective medications for stimulant abuse.
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Acknowledgements
We thank Patty Ballerstadt for administrative assistance and Drs Tsung-Ping Su, Teruo Hayashi, James H. Woods, and James E. Barrett for advice on these studies and the preparation of the manuscript. The work reported herein was supported by the Intramural Research Program of the National Institute on Drug Abuse.
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Portions of this manuscript were presented at the annual meeting of International Study Group Investigating Drugs as Reinforcers (Scottsdale, AZ; June 2010), the annual meeting of Experimental Biology (Washington, DC; April 2011), and the Early Career Investigators Poster Session (cosponsored by NIDA/NIAAA/APA, and APA Divisions 28 and 50), American Psychological Association, 119th Annual Meeting (Washington, DC; August 2011). An abstract describing these results was included in the program materials of the canceled annual meeting of the Japanese Pharmacological Society(Yokohama, Japan; March 2011)
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Hiranita, T., Mereu, M., Soto, P. et al. Self-Administration of Cocaine Induces Dopamine-Independent Self-Administration of Sigma Agonists. Neuropsychopharmacol 38, 605–615 (2013). https://doi.org/10.1038/npp.2012.224
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DOI: https://doi.org/10.1038/npp.2012.224
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