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Mechanisms linking in utero stress to altered offspring behaviour
Theresia H Mina1, Rebecca M Reynolds
1Endocrinology Unit, Queen's Medical Research Institute, University/British Heart Foundation Centre for Cardiovascular Science, 47 Little France Crescent, Edinburgh, EH16 4TJ, UK.
Insights
Maternal stress during pregnancy can negatively impact offspring behavior and cognitive function, persisting into adulthood. Understanding these early life programming mechanisms is crucial for developing interventions.
Area of Science:
- Developmental psychology
- Neuroendocrinology
- Maternal-fetal medicine
Background:
- Early life programming links in utero development to later-life health.
- Maternal stress, anxiety, and depression in pregnancy are associated with adverse offspring behavioral outcomes.
- These behavioral issues manifest early and can persist into adulthood.
Purpose of the Study:
- To explore the underlying mechanisms linking prenatal stress to offspring behavioral problems.
- To investigate the role of the hypothalamic-pituitary-adrenal (HPA) axis in mediating these effects.
- To identify critical periods of vulnerability during gestation.
Main Methods:
- Review of existing human studies on maternal prenatal stress and offspring outcomes.
- Examination of proposed mechanisms involving glucocorticoid exposure and HPA axis dysregulation.
- Analysis of potential alterations in maternal cortisol levels and placental function.
Main Results:
- Prenatal stress exposure is linked to adverse behavioral and cognitive outcomes in offspring.
- Dysregulation of the maternal and offspring hypothalamic-pituitary-adrenal (HPA) axis is a proposed mechanism.
- Altered maternal cortisol and placental changes may increase fetal glucocorticoid exposure, affecting offspring behavior.
Conclusions:
- Prenatal stress impacts offspring neurodevelopment and behavior through HPA axis pathways.
- Further research is needed to understand specific vulnerable periods and pathways.
- Identifying these mechanisms can inform interventions to mitigate negative impacts of in utero stress.
Abstract:
Development in utero is recognised as a determinant of health in later life, a concept known as early life 'programming'. Several studies in humans have now shown a link between in utero stressors of maternal stress, anxiety and depression and adverse behavioural outcomes for the offspring including poorer cognitive function and behavioural and emotional problems. These behaviours are observed from the very early neonatal period and appear to persist through to adulthood. Underlying mechanisms are not known but overexposure of the developing foetus to glucocorticoids has been proposed. Dysregulation of the maternal and offspring hypothalamic-pituitary-adrenal (HPA) axis has been proposed as a mechanism linking in utero stress with offspring behavioural outcomes. Studies suggest that altered circulating levels of maternal cortisol during pregnancy and/or changes in placental gene expression or methylation, which result in increased glucocorticoid transfer to the developing foetus, are linked to changes in offspring behaviour and in activity of the offspring HPA axis. Further understanding of the underlying pathways and identification of any gestation of vulnerability are needed to help design interventions to reduce in utero stress and improve behavioural outcomes in the offspring.
