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Downregulation of the neuronal opioid gene expression concomitantly with neuronal decline in dorsolateral prefrontal cortex of human alcoholics
Uppsala universitet, Medicinska och farmaceutiska vetenskapsområdet, Farmaceutiska fakulteten, Institutionen för farmaceutisk biovetenskap.ORCID-id: 0000-0003-4388-1656
Uppsala universitet, Medicinska och farmaceutiska vetenskapsområdet, Farmaceutiska fakulteten, Institutionen för farmaceutisk biovetenskap.ORCID-id: 0000-0002-2451-4386
Uppsala universitet, Medicinska och farmaceutiska vetenskapsområdet, Farmaceutiska fakulteten, Institutionen för farmaceutisk biovetenskap.ORCID-id: 0000-0002-1332-7067
Uppsala universitet, Medicinska och farmaceutiska vetenskapsområdet, Farmaceutiska fakulteten, Institutionen för farmaceutisk biovetenskap.
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2018 (engelsk)Inngår i: Translational Psychiatry, ISSN 2158-3188, E-ISSN 2158-3188, Vol. 8, artikkel-id 122Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

Molecular changes in cortical areas of addicted brain may underlie cognitive impairment and loss of control over intake of addictive substances and alcohol. Prodynorphin (PDYN) gives rise to dynorphin (DYNs) opioid peptides which target kappa-opioid receptor (KOR). DYNs mediate alcohol-induced impairment of learning and memory, while KOR antagonists block excessive, compulsive-like drug and alcohol self-administration in animal models. In human brain, the DYN/KOR system may undergo adaptive changes, which along with neuronal loss, may contribute to alcohol-associated cognitive deficit. We addressed this hypothesis by comparing the expression levels and co-expression (transcriptionally coordinated) patterns of PDYN and KOR (OPRK1) genes in dorsolateral prefrontal cortex (dlPFC) between human alcoholics and controls. Postmortem brain specimens of 53 alcoholics and 55 controls were analyzed. PDYN was found to be downregulated in dlPFC of alcoholics, while OPRK1 transcription was not altered. PDYN downregulation was confined to subgroup of subjects carrying C, a high-risk allele of PDYN promoter SNP rs1997794 associated with alcoholism. Changes in PDYN expression did not depend on the decline in neuronal proportion in alcoholics, and thereby may be attributed to transcriptional adaptations in alcoholic brain. Absolute expression levels of PDYN were lower compared to those of OPRK1, suggesting that PDYN expression is a limiting factor in the DYN/KOR signaling, and that the PDYN downregulation diminishes efficacy of DYN/KOR signaling in dlPFC of human alcoholics. The overall outcome of the DYN/KOR downregulation may be disinhibition of neurotransmission, which when overactivated could contribute to formation of alcohol-related behavior.

sted, utgiver, år, opplag, sider
NATURE PUBLISHING GROUP , 2018. Vol. 8, artikkel-id 122
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URN: urn:nbn:se:uu:diva-358683DOI: 10.1038/s41398-017-0075-5ISI: 000437025300001PubMedID: 29925858OAI: oai:DiVA.org:uu-358683DiVA, id: diva2:1245707
Forskningsfinansiär
Forte, Swedish Research Council for Health, Working Life and Welfare, 2009-1709Forte, Swedish Research Council for Health, Working Life and Welfare, 259-2012-23Swedish Research Council, K2014-62X-12190-19-5Tilgjengelig fra: 2018-09-05 Laget: 2018-09-05 Sist oppdatert: 2018-09-17bibliografisk kontrollert

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