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Evidence for a mu-opioid-oploid connection between the paraventricular nucleus and ventral tegmental area in the rat

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Quinn, JG, O'Hare, E, Levine, AS and Kim, Eun-Mee (2003) Evidence for a mu-opioid-oploid connection between the paraventricular nucleus and ventral tegmental area in the rat. BRAIN RESEARCH, 991 (1-2). pp. 206-211. [Journal article]

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DOI: 10.1016/j.brainres.2003.08.020

Abstract

The paraventricular nucleus (PVN) and the ventral tegmental area (VTA) have been shown to be involved in opioid mediated feeding behavior. The present study examined whether mu-opioid signalling between the PVN and VTA affected feeding behavior. Male Sprague-Dawley rats were cannulated with one cannula placed in the PVN and two cannulae placed in the VTA, which allowed for co-administration of the mu-opioid receptor agonist [D-Ala(2), NMe-Phe(4), Gly-ol(5)]-enkephalin (DAMGO) in one site and the opioid antagonist naltrexone (NTX) in the other site. Bilateral administration of DAMGO (1.2, 2.4 and 4.9 nmol) into the VTA stimulated feeding dose dependently at 2.4 and 4.9 nmol (P<0.05). The DAMGO (2.4 nmol)-induced increase of food intake following injection into the PVN was blocked by bilateral injection of NTX (6.6, 13.2 and 26.5 nmol) into the VTA at 2 and 4 h (P<0.05). In the reverse situation, the DAMGO (2.4 nmol)-induced increase of food intake following injection into the VTA was blocked by injection of NTX (13.2 and 26.5 nmol) into the PVN at 2 and 4 h (P<0.05). The present study suggests that a bidirectional mu-opioid-opioid signalling pathway exists between the PVN and the VTA which influences feeding. (C) 2003 Elsevier B.V. All rights reserved.

Item Type:Journal article
Faculties and Schools:Faculty of Life and Health Sciences
Faculty of Life and Health Sciences > School of Psychology
Research Institutes and Groups:Psychology Research Institute
Psychology Research Institute > Behavioural Neuroscience & Behavioural Analysis
ID Code:1637
Deposited By:Mrs Fiona Harkin
Deposited On:23 Dec 2009 09:29
Last Modified:13 Mar 2012 16:34

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