title: Endogenous opioid system influences depressive reactions to socially painful targeted rejection life events.
abstract: Although exposure to a recent major life event is one of the strongest known risk factors for depression, many people who experience such stress do not become depressed. Moreover, the biological mechanisms underlying differential emotional reactions to social adversity remain largely unknown. To investigate this issue, we examined whether the endogenous opioid system, which is known to influence sensitivity to physical pain, is also implicated in differential risk for depression following socially painful targeted rejection versus non-targeted rejection life events. Adolescents (n=420) enrolled in a large longitudinal birth cohort study had their recent stress exposure and current mental health status assessed using self-report and interview-based methods. Participants were also genotyped for the A118G polymorphism in the μ-opioid receptor gene (OPRM1, rs1799971), which has been found to influence neural and psychological responses to rejection, likely by affecting opioid receptor expression and signaling efficiency. As hypothesized, G allele carriers, who are known to exhibit less opioid receptor expression and signaling efficiency, were more severely depressed and twice as likely to meet criteria for major depressive disorder following a recent targeted rejection major life event (e.g., being broken up with, getting fired) relative to A/A homozygotes who experienced such stress. However, A118G genotype did not moderate the effects of other similarly severe major life events on depression. These data thus elucidate a biological pathway that may specifically influence sensitivity to social pain and rejection, which in turn has implications for understanding differential risk for depression and several other social stress-related disorders.
authors.affiliation: Cousins Center for Psychoneuroimmunology, University of California, Los Angeles, USA; Department of Psychiatry and Biobehavioral Sciences, University of California, Los Angeles, USA. Electronic address: gslavich@mednet.ucla.edu.
authors.forename: George M
authors.initials: GM
authors.lastname: Slavich
authors.affiliation: Department of Psychology, University of California, Los Angeles, USA.
authors.forename: Molly A
authors.initials: MA
authors.lastname: Tartter
authors.affiliation: Department of Psychology, Emory University, USA.
authors.forename: Patricia A
authors.initials: PA
authors.lastname: Brennan
authors.affiliation: Department of Psychiatry and Biobehavioral Sciences, University of California, Los Angeles, USA; Department of Psychology, University of California, Los Angeles, USA.
authors.forename: Constance
authors.initials: C
authors.lastname: Hammen
mesh_terms: D000293:Adolescent; D000294:Adolescent Behavior / Q000523:psychology; D000483:Alleles; D003865:Major Depressive Disorder / Q000235:genetics* / Q000378:metabolism / Q000523:psychology*; D005260:Female; D020022:Genetic Predisposition to Disease / Q000235:genetics*; D005838:Genotype; D006720:Homozygote; D006801:Humans; D008016:Life Change Events; D008137:Longitudinal Studies; D008297:Male; D020641:Polymorphism, Single Nucleotide / Q000235:genetics; D017450:Receptors, Opioid, mu / Q000235:genetics* / Q000378:metabolism; D012059:Rejection, Psychology; D055815:Young Adult
chemical_list: D017450:Receptors, Opioid, mu
keywords: A118G; Adolescence; Disease; Genetic; Health; Opioid; Pain; Polymorphism; Risk; Stress
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