Prenatal maternal cortisol concentrations predict neurodevelopment in middle childhood

Area of Science:

• Neuroscience
• Developmental Biology
• Endocrinology

Background:

• Glucocorticoids, like cortisol, are key in fetal brain development via the hypothalamic-pituitary-adrenocortical (HPA) axis.
• Maternal prenatal cortisol exposure is hypothesized to influence child neurodevelopment.
• Understanding this link is crucial for fetal programming research.

Purpose of the Study:

• To investigate the association between prenatal maternal cortisol levels and child neurodevelopment.
• To assess the impact of maternal cortisol on brain structure and cognitive function in children aged 6-9 years.

Main Methods:

• Prospective longitudinal study of 91 mother-child pairs.
• Measured maternal plasma cortisol at 19 and 31 gestational weeks.
• Assessed child brain structure (cortical thickness via MRI) and cognitive function (WISC-IV, EVT-2) at 6-9 years.

Main Results:

• Higher third-trimester maternal cortisol correlated with increased child cortical thickness, particularly in frontal regions.
• Elevated third-trimester maternal cortisol was associated with enhanced child cognitive performance.
• No significant association found between prenatal cortisol and child cortical thinning.

Conclusions:

• Elevated maternal cortisol in late gestation may confer lasting benefits for child brain development and cognition.
• Findings support cortisol's role in fetal maturation, suggesting potential long-term advantages.
• Extreme elevations or synthetic glucocorticoids may pose neurotoxic risks to the developing fetal brain.