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Prenatal Dexamethasone Programs Autonomic Dysregulation in Female Rats. | LitMetric

AI Article Synopsis

Article Abstract

Autonomic dysfunction is associated with cardiovascular and neurological disease, including hypertension, heart failure, anxiety, and stress-related disorders. Prior studies demonstrated that late gestation exposure to dexamethasone (DEX) resulted in female-biased increases in stress-responsive mean arterial pressure (MAP) and heart rate (HR), suggesting a role for glucocorticoid-mediated programming of autonomic dysfunction. The present study investigated the influence of sympathetic (SYM) or parasympathetic (PS) blockade on cardiovascular function in male and female rat offspring of mothers injected with DEX (gestation days [GD]18-21). At 11-12- weeks of age, MAP, HR, and heart rate variability (HRV) were evaluated at baseline and in response to SYM antagonists (α-adrenoceptor + β-adrenoceptor), a PS (muscarinic) antagonist, or saline (SAL). To assess stress-responsive function, rats were exposed to acute restraint. Tyrosine hydroxylase was measured in adrenals and left ventricle, and gene expression for the β adrenergic receptor, choline acetyltransferase, and acetylcholinesterase were measured in left ventricle. Maternal DEX injection reduced basal HRV in male and female offspring. SYM blockade attenuated increases in stress-responsive HR and MAP. PS blockade elevated stress-responsive HR and MAP to a greater extent in Vehicle females. SYM and PS blockade produced equivalent effects on HR and MAP responses in male offspring, regardless of maternal treatment. Based on these findings, we suggest that maternal DEX injection disrupted autonomic regulation of cardiovascular function in females, resulting in a shift toward greater SYM input and less input from PS. Future studies will investigate whether changes in autonomic function are mediated by changes in central autonomic circuitry.

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http://dx.doi.org/10.1152/ajpheart.00075.2024DOI Listing

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