Abstract
Rationale
Group II metabotropic glutamate receptor (mGluR2/3) agonists are proposed to serve as potential treatment for addiction.
Objectives
The present study examined the hypothesis that mGluR2/3 agonists exert inhibitory effects on cocaine-induced reinstatement of cocaine-seeking.
Methods
Rats were trained to self-administer either cocaine or control reinforcer (food), then responding on the reinforcer-paired lever was extinguished. Reinstatement of responding was induced by a noncontingent presentation of the self-administered reinforcer (10 mg/kg cocaine, i.p. or 765 mg of food). In one experiment, rats were systemically pretreated with vehicle (Veh) or the mGluR2/3 agonist LY379268 (0.3, 1, or 3 mg/kg, i.p.) 30 min before the reinstatement test session. In a second experiment, Veh or LY379268 (0.05, 0.5, or 5 nmol/side) was microinjected into the nucleus accumbens core (NAc core) 5 min before the reinstatement test session. The effects of LY379268 on cocaine- and food-induced reinstatement on reward seeking were assessed.
Results
Both systemic and intra-NAc core pretreatment with LY379268 inhibited both cocaine- and food-seeking behavior. However, the effect of LY379268 appeared somewhat more effective for cocaine-seeking than food-seeking.
Conclusions
These results support a potential therapeutic role for mGluR2/3 agonists on relapse of cocaine-seeking. However, doses that inhibited cocaine-seeking were only threefold lower than those inhibiting food-seeking, indicating possible unacceptable nonspecific effects. In addition, the NAc core is one site of action where the mGluR2/3 agonists elicit effects on reward-seeking behavior.
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Acknowledgements
This work was supported by NIDA grants DA-12513 (PWK), DA-18486 (JP), and program project DA-05369.
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Peters, J., Kalivas, P.W. The group II metabotropic glutamate receptor agonist, LY379268, inhibits both cocaine- and food-seeking behavior in rats. Psychopharmacology 186, 143–149 (2006). https://doi.org/10.1007/s00213-006-0372-9
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DOI: https://doi.org/10.1007/s00213-006-0372-9