S-3,4-DCPG, a potent orthosteric agonist for the mGlu8 receptor, facilitates extinction and inhibits the reinstatement of morphine-induced conditioned place preference in male rats

被引:0
作者
Kahvandi, Nazanin [1 ,2 ]
Ebrahimi, Zahra [1 ,2 ]
Sharifi, Maryam [1 ]
Karimi, Seyed Asaad [1 ,3 ]
Shahidi, Siamak [1 ,3 ]
Salehi, Iraj [1 ,3 ]
Haddadi, Rasool [4 ]
Sarihi, Abdolrahman [1 ,3 ]
机构
[1] Hamadan Univ Med Sci, Neurophysiol Res Ctr, Hamadan, Iran
[2] Hamadan Univ Med Sci, Fac Med, Dept Physiol, Hamadan, Iran
[3] Hamadan Univ Med Sci, Sch Sci & Adv Technol Med, Dept Neurosci, Hamadan 6517838736, Iran
[4] Hamadan Univ Med Sci, Sch Pharm, Dept Pharmacol & Toxicol, Hamadan, Iran
关键词
Metabotropic glutamate receptor type 8; Nucleus accumbens; Extinction; Reinstatement; Conditioned place preference; Morphine; Rat; METABOTROPIC GLUTAMATE RECEPTORS; COCAINE-INDUCED REINSTATEMENT; CUE-INDUCED REINSTATEMENT; NUCLEUS-ACCUMBENS; ANTAGONIST MPEP; DRUG-SEEKING; EXPRESSION; ADDICTION; LY379268; REINFORCEMENT;
D O I
10.1016/j.pbb.2024.173772
中图分类号
B84 [心理学]; C [社会科学总论]; Q98 [人类学];
学科分类号
03 ; 0303 ; 030303 ; 04 ; 0402 ;
摘要
The limbic system, particularly the NAc, shows a high concentration of metabotropic glutamate receptors (mGluRs). Recent evidence suggests the significant involvement of mGluRs in mental disorders, including substance abuse and addiction. The objective of this study was to examine the involvement of mGlu8 receptors in the NAc in the mechanisms underlying the extinction and reinstatement of conditioned place preference (CPP) induced by morphine. Male Wistar rats underwent surgical implantation of bilateral cannulas in the NAc and were assessed in a CPP protocol. In study 1 at the same time as the extinction phase, the rats were given varying doses of S-3,4-DCPG (0.03, 0.3, and 3 mu g/0.5 mu l). In study 2, rats that had undergone CPP extinction were given S3,4-DCPG (0.03, 0.3, and 3 mu g/0.5 mu l) five minutes prior to receiving a subthreshold dose of morphine (1 mg/kg) in order to reactivate the previously extinguished morphine response. The findings demonstrated that administering S-3,4-DCPG directly into the accumbens nucleus resulted in a decrease in the duration of the CPP extinction phase. Moreover, dose-dependent administration of S-3,4-DCPG into the NAc inhibited CPP reinstatement. The observations imply that microinjection of S-3,4-DCPG as a potent orthosteric agonist with high selectivity for the mGlu8 receptor into the NAc promotes the process of extinction while concurrently exerting inhibitory effects on the reinstatement of morphine-induced CPP. This effect may be associated with the modulation of glutamate engagement within the NAc and the plasticity of reward pathways at the synaptic level.
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页数:10
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