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Chinese Journal of Clinical Pharmacology and Therapeutics ›› 2017, Vol. 22 ›› Issue (12): 1377-1381.

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Expression of RGS4 and D2 receptor signaling pathway in striatum of methamphetamine-dependent CPP rats

MENG Guoyi1 ,HE Fanyi1 ,SUI Nianhan1 , ZHAO Linbo1 , HONG Shijun 2, XING Yuming3 ,ZHAO Yongna 1   

  1. 1 School of Pharmaceutical Sciences and Yunnan Key Laboratory of Pharmacology for Natural Product,Kunming Medical University,2 School of Forensic Medicine,Kunming Medical University,Kunming 650500,Yunnan,China;3 Key Laboratory of Narcotics Technology and Ministry of Police of Yunnan Provincial Police Department,Kunming 650228,Yunnan,China
  • Received:2017-07-20 Revised:2017-08-23 Online:2017-12-26 Published:2018-01-02

Abstract:

AIM: To study the expression of signal transduction molecules in the striatum G protein protein 4 (RGS4) and dopamine D2 receptor (D2) in conditioned place preference (CPP) rats treated with methamphetamine (meth).  METHODS: METH dependence CPP model was established (1 week and 2 weeks of METH dependence groups), The protein expression of RGS4 and D2, inhibitory G protein alpha-subunit (Gαi), mitogen-activated protein kinase (MAPK) in striatum were determined by Western blotting (WB). The changes of cyclic adenosine monophosphate (cAMP) content in striatum of rats were determined by enzyme linked immunosorbent assay (ELISA). RESULTS:Compared with saline control group, the average time of rats in the methamphetamine-paired chamber for two groups was increased (P<0.05). Compared with saline control group, RGS4 protein expressions in the two METH dependent groups were reduced (P<0.01); compared with 1 week of METH dependence group, that of 2 weeks group was reduced significantly (P<0.05). D2, Gαi, MAPK protein and cAMP expressions in the two METH dependent groups were increased (P<0.01); compared with 1 week of METH dependence group, those of 2 weeks were increased significantly (P<0.05). CONCLUSION: RGS4 and D2 receptor signaling pathways in striatum have changed in METH dependent rats, RGS4 may be involved in the regulation of METH-dependent D2 receptor signaling pathway in METH dependent rats.

Key words: methamphetamine, CPP, RGS4, D2, Gαi, MAPK, cAMP

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