Psychosocial stress and psychosis. A review of the neurobiological mechanisms and the evidence for gene-stress interaction.

Schizophrenia Bulletin
Ruud van WinkelInez Myin-Germeys

Abstract

This article presents evidence suggesting that psychosocial stress may increase risk for psychosis, especially in the case of cumulative exposure. A heuristically useful framework to study the underlying mechanisms is the concept of "behavioral sensitization" that stipulates that exposure to psychosocial stress--such as life events, childhood trauma, or discriminatory experiences--may progressively increase the behavioral and biological response to subsequent exposures. The neurobiological substrate of sensitization may involve dysregulation of the hypothalamus-pituitary-adrenal axis, contributing to a hypothesized final common pathway of dopamine sensitization in mesolimbic areas and increased stress-induced striatal dopamine release. It is argued that, in order to reconcile genetic and environmental influences on the development of psychosis, gene-environment interactions may be an important mechanism in explaining between-subject differences in risk following (cumulative) exposure to psychosocial stress. To date, most studies suggestive of gene-stress interaction have used proxy measures for genetic vulnerability such as a family history of psychosis; studies investigating interactions between molecular genetic measures and ...Continue Reading

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