| Literature DB >> 25926444 |
Gemma Navarro1, César Quiroz2, David Moreno-Delgado1, Adam Sierakowiak2, Kimberly McDowell2, Estefanía Moreno1, William Rea2, Ning-Sheng Cai2, David Aguinaga1, Lesley A Howell3, Felix Hausch4, Antonio Cortés1, Josefa Mallol1, Vicent Casadó1, Carme Lluís1, Enric I Canela1, Sergi Ferré5, Peter J McCormick6.
Abstract
Release of the neuropeptides corticotropin-releasing factor (CRF) and orexin-A in the ventral tegmental area (VTA) play an important role in stress-induced cocaine-seeking behavior. We provide evidence for pharmacologically significant interactions between CRF and orexin-A that depend on oligomerization of CRF1 receptor (CRF1R) and orexin OX1 receptors (OX1R). CRF1R-OX1R heteromers are the conduits of a negative crosstalk between orexin-A and CRF as demonstrated in transfected cells and rat VTA, in which they significantly modulate dendritic dopamine release. The cocaine target σ1 receptor (σ1R) also associates with the CRF1R-OX1R heteromer. Cocaine binding to the σ1R-CRF1R-OX1R complex promotes a long-term disruption of the orexin-A-CRF negative crosstalk. Through this mechanism, cocaine sensitizes VTA cells to the excitatory effects of both CRF and orexin-A, thus providing a mechanism by which stress induces cocaine seeking.Entities:
Keywords: CRF receptor; GPCR heteromer; cocaine; orexin receptor; sigma receptor
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Year: 2015 PMID: 25926444 PMCID: PMC4412889 DOI: 10.1523/JNEUROSCI.4364-14.2015
Source DB: PubMed Journal: J Neurosci ISSN: 0270-6474 Impact factor: 6.167