Journal
JOURNAL OF THE AMERICAN ACADEMY OF CHILD AND ADOLESCENT PSYCHIATRY
Volume 50, Issue 6, Pages 574-582Publisher
ELSEVIER SCIENCE INC
DOI: 10.1016/j.jaac.2011.02.015
Keywords
early-life stress; cortisol; HPA axis; discordant MZ twin design; bullying
Categories
Funding
- Medical Research Council (MRC) [G9806489]
- British Academy
- Jacobs Foundation
- Economic and Social Research Council (ESRC) [RES-177-25-0013]
- Nuffield Foundation
- National Institute of Child Health and Human Development [HD061298]
- Canadian Institutes of Health Research
- National Alliance for Research on Schizophrenia and Depression Young Investigator Award
- UK Department of Health
- Royal Society
- Hebrew University
- Caselberg Trust
- Economic and Social Research Council [ES/H034897/1] Funding Source: researchfish
- Medical Research Council [G1002190, G9817803B, G9806489] Funding Source: researchfish
- National Institute for Health Research [CSA/01/05/001] Funding Source: researchfish
- ESRC [ES/H034897/1] Funding Source: UKRI
- MRC [G9806489, G1002190] Funding Source: UKRI
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Objective: Childhood adverse experiences are known to engender persistent changes in stress-related systems and brain structures involved in mood, cognition, and behavior in animal models. Uncertainty remains about the causal effect of early stressful experiences on physiological response to stress in human beings, as the impact of these experiences has rarely been investigated while controlling for both genetic and shared environmental influences. Method: We tested whether bullying victimization, a repeated adverse experience in childhood, influences cortisol responses to a psychosocial stress test (PST) using a discordant monozygotic (MZ) twin design. Thirty pairs (43.3% males) of 12-year-old MZ twins discordant for bullying victimization were identified in the Environmental Risk (E-Risk) Longitudinal Twin Study, a nationally representative 1994-1995 cohort of families with twins. Results: Bullied and nonbullied MZ twins showed distinct patterns of cortisol secretion after the PST. Specifically, bullied twins exhibited a blunted cortisol response compared with their nonbullied MZ co-twins, who showed the expected increase. This difference in cortisol response to stress could not be attributed to children's genetic makeup, their familial environments, pre-existing and concomitant individual factors, or the perception of stress and emotional response to the PST. Conclusion: Results from this natural experiment provide support for a causal effect of adverse childhood experiences on the neuroendocrine response to stress. J. Am. Acad. Child Adolesc. Psychiatry, 2011;50(6):574-582.
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