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Functional CRH variation increases stress-induced alcohol consumption in primates. | LitMetric

AI Article Synopsis

Article Abstract

Corticotropin-releasing factor (CRF), encoded by the CRH gene, is a key integrator of stress responses, and, as such, CRH gene variation may contribute to individual differences in susceptibility to stress-related pathology. In rhesus macaques, a single nucleotide polymorphism (SNP) is found within the CRH promoter (-248C--> T). Here, we assessed whether this variant influenced stress responding and, because increased CRF system activity drives alcohol drinking in rodents, we examined whether it predicted voluntary alcohol consumption as a function of prior stress exposure. Using a hypothalamic nuclear extract, we showed that the -248 T allele resulted in increased DNA protein interactions relative to the C allele. In vitro, the T allele resulted in CRH promoter activity that was higher following both stimulation with forskolin and treatment with dexamethasone. Endocrine and behavioral responses to social separation stress (release of ACTH and cortisol, and suppression of environmental exploration, respectively) were higher among carriers of the T allele, particularly among those exposed to early adversity in the form of peer rearing. We also found that T allele carriers with a history of early life adversity consumed more alcohol in a limited-access paradigm. Our data suggest that CRH promoter variation that confers increased stress reactivity increases the risk for alcohol use disorders in stress-exposed individuals.

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Source
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2732884PMC
http://dx.doi.org/10.1073/pnas.0902863106DOI Listing

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