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Sci Rep. 2018 Jan 29;8(1):1759. doi: 10.1038/s41598-018-19816-x.

Social rank-associated stress vulnerability predisposes individuals to cocaine attraction.

Author information

1
Department of Molecular Biology, Ariel University, Ariel, Israel.
2
Leslie and Susan Gonda (Goldschmied) Multidisciplinary Brain Research Center and the Mina and Everard Goodman Faculty of Life Sciences, Bar-Ilan University, Ramat-Gan, Israel. yadidg@mail.biu.ac.il.
3
Department of Molecular Biology, Ariel University, Ariel, Israel. albertpi@ariel.ac.il.

Abstract

Studies of personality have suggested that dissimilarities in ability to cope with stressful situations results in differing tendency to develop addictive behaviors. The present study used selectively bred stress-resilient, socially-dominant (Dom) and stress-vulnerable, socially-submissive (Sub) mice to investigate the interaction between environmental stress and inbred predisposition to develop addictive behavior to cocaine. In a Conditioned Place Preference (CPP) paradigm using cocaine, Sub mice displayed an aversion to drug, whereas Dom mice displayed drug attraction. Following a 4-week regimen of Chronic Mild Stress (CMS), Sub mice in CPP displayed a marked increase (>400%) in cocaine attraction, whereas Dom mice did not differ in attraction from their non-stressed state. Examination of hippocampal gene expression revealed in Sub mice, exposure to external stimuli, stress or cocaine, increased CRH expression (>100%), which was evoked in Dom mice only by cocaine exposure. Further, stress-induced decreases in DRD1 (>60%) and DRD2 (>50%) expression in Sub mice differed markedly from a complete lack of change in Dom mice. From our findings, we propose that social stratification dictates vulnerability to stress-induced attraction that may lead to addiction via differential regulation of hippocampal response to dopaminergic input, which in turn may influence differing tendency to develop addictive behaviors.

PMID:
29379100
PMCID:
PMC5789078
DOI:
10.1038/s41598-018-19816-x
[Indexed for MEDLINE]
Free PMC Article

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