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Lateral Habenula Electrical Stimulation With Different Intensities in Combination With Gabab Receptor Antagonist Reduces Acquisition and Expression Phases of Morphine-Induced Cpp Publisher Pubmed



Amohashemi E1 ; Reisi P1 ; Alaei H1
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  1. 1. Department of Physiology, School of Medicine, Isfahan University of Medical Sciences, Isfahan, Iran

Source: Neuroscience Letters Published:2021


Abstract

The lateral habenula (LHb) plays a principal role in response to aversive stimuli and negative emotional states. In this study, we have evaluated the effects of unilateral electrical stimulation (e-stim) of the LHb on morphine-conditioned place preference (CPP), before or after bilateral injections of Gamma-aminobutyric acid-B receptor (GABABR) antagonist, phaclofen, in male rats. Morphine (5 mg/kg; s.c.) induced a significant CPP, using a 5-day CPP paradigm. Intra-LHb microinjection of phaclofen or the LHb e-stim decreased only the acquisition of CPP. The 150 μA stimulation plus phaclofen significantly suppressed the expression phase but induced aversion in the acquisition of CPP, and an e-stim of 25 μA in combination with the antagonist, significantly prevented only the acquisition phase. The findings of this study confirm the possible role of GABABRs in the LHb on the acquisition and the expression of CPP. These results show that e-stim of LHb alone or plus phaclofen may change the GABA transmission, involving into CPP. Therefore, the GABAergic system, especially through GABABRs, may play a prominent role in the behavioral responses to morphine-induced CPP by LHb stimulation. © 2021
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