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• W2104281464 abstract "Previously, we reported that lateral hypothalamic (LH) orexin neurons are stimulated in proportion to the preference shown for reward-associated cues during conditioned place preference (CPP) testing. Here, we examine for the first time the role of these neurons in the acquisition of morphine CPP. Results show that LH orexin neurons, but not those in the perifornical area (PFA), are stimulated during conditioning when morphine is given in a novel drug-paired environment (CPP compartment) but not when given in the home cage, nor when saline was given in the CPP environment. Furthermore, bilateral excitotoxic lesions of the LH orexin area completely blocked the acquisition of morphine CPP. Lesions that spared LH orexin neurons had no effect. Orexin neurons in the LH project to the ventral tegmental area (VTA), an area important in the acquisition of morphine CPP. Therefore, we investigated the importance of the LH orexin connection to the VTA in the acquisition of a morphine CPP using a disconnection technique involving a unilateral excitotoxic lesion of LH orexin neurons and contralateral blockade of VTA orexin receptors. Results indicated that a unilateral LH orexin lesion together with a microinjection of the orexin A antagonist (SB 334867) into the contralateral VTA prior to each morphine-pairing session was sufficient to block the development of a morphine CPP. Either of these treatments by themselves was not sufficient to block CPP development. These results demonstrate the importance of LH orexin neurons and their projections to the VTA in the formation of associations between environmental cues and drug reward." @default.
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• W2104281464 date "2007-10-01" @default.
• W2104281464 modified "2023-10-09" @default.
• W2104281464 title "Lateral hypothalamic orexin neurons are critically involved in learning to associate an environment with morphine reward" @default.
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• W2104281464 doi "https://doi.org/10.1016/j.bbr.2007.05.025" @default.
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