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- W4247486346 abstract "Abstract Background The addictive properties of opioids may be mediated to some extent by cocaine- and amphetamine-regulated transcript (CART) in the reward pathway. There are also some claims regarding the interaction of CART and glutamate system. Drug-paired learning and memory may induce conditioned place preference (CPP) or conditioned place aversion (CPA). Here, we have evaluated whether intra-nucleus accumbens (NAc) shell infusions of CART induces CPP or CPA and affect morphine reward. In addition, we have measured the expression of the NR1 subunit of the N-methyl-D-aspartate (NMDA) glutamate receptor in various parts of the reward pathway (NAc, prefrontal cortex (PFC), and hippocampus) after conditioning tests. Bilateral cannulas were implanted in the rats NAc shell and then the animals were exposed to place conditioning. Animals were place-conditioned with several doses of subcutaneous (s.c.) morphine prior to the intra-NAc shell infusion of artificial cerebral spinal fluid (aCSF). Immunohistochemistry (IHC) data showed a dose-dependent increase in the expression of the NR1 subunit in all examined parts. Then, rats were conditioned with intra-NAc shell infusion of different doses of CART. CPP and CPA were induced with 2.5 and 5 μg/side, respectively.Results IHC showed an elevated level of NR1 with 2.5 μg/side and a decrease with 5 μg/side in all areas. Administration of a sub-rewarding dose of CART (1.25 μg/side) prior to the injection of a sub-rewarding dose of morphine (2.5 mg/kg) induced CPP and IHC analysis showed an increased amount of NR1 in all examined tissues. However, infusion of an aversive dose of CART (5 μg/side) prior to the injection of a rewarding dose of morphine (5 mg/kg) produced neither CPP nor CPA and IHC data showed a significant decrease in the amount of NR1 subunit in the NAc and hippocampus.Conclusions It seems that the rewarding or aversive effects of intra-NAc shell CART and its facilitating or inhibiting effects on morphine reward are dose-dependent. Furthermore, the NMDA receptor may be closely involved in the affective properties of opioids and CART in the reward pathway." @default.
- W4247486346 created "2022-05-12" @default.
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- W4247486346 date "2020-01-09" @default.
- W4247486346 modified "2023-09-27" @default.
- W4247486346 title "The effect of microinjection of CART 55-102 into the nucleus accumbens shell on morphine-induced conditioned place preference in rats: Involvement of the NMDA receptor" @default.
- W4247486346 doi "https://doi.org/10.21203/rs.2.20474/v1" @default.
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