Differences in basal and ethanol-induced levels of opioid peptides in Wistar rats from five different suppliers

Peptides
Sara PalmIngrid Nylander

Abstract

One major cause for discrepancies in results from animal experimental studies is the use of different animal strains and suppliers. We have previously reported that Wistar rats from five different suppliers display profound differences in ethanol intake and behavior. One of the neurobiological processes that could be underlying these differences is the endogenous opioid system, which has been implicated in the rewarding and reinforcing effects of alcohol. We therefore hypothesized that the differences between the supplier groups would also be evident in the endogenous opioid system. Radioimmunoassay was used to determine the levels of the opioid peptides Met-enkephalin-Arg(6)Phe(7) and dynorphin B in several brain areas of ethanol-drinking and ethanol naïve Wistar rats from five different suppliers. In the ethanol naïve animals, differences between the supplier groups were found in the pituitary gland, hypothalamus, frontal cortex, dorsal striatum and hippocampus. In the ethanol-drinking rats, differences were found in the same structures, with the addition of medial prefrontal cortex and substantia nigra. Correlations between ethanol intake and peptide levels were also found in several of the areas examined. The structures in ...Continue Reading

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Citations

Oct 16, 2013·Peptides·Richard J Bodnar
Feb 18, 2015·Progress in Neuro-psychopharmacology & Biological Psychiatry·Jessica R Barson, Sarah F Leibowitz
Dec 18, 2014·Alcoholism, Clinical and Experimental Research·Sara Palm, Ingrid Nylander
Dec 6, 2019·Frontiers in Behavioral Neuroscience·Arshi MustafaSvante Winberg
Sep 27, 2018·Frontiers in Psychiatry·Linnea GranholmIngrid Nylander

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