Sex differences in prenatal programming of hypertension by dexamethasone

Area of Science:

• Endocrinology
• Developmental Biology
• Nephrology

Background:

• Prenatal exposure to synthetic glucocorticoids like dexamethasone can impact offspring development.
• Previous studies indicate dexamethasone increases blood pressure in male offspring, but the underlying mechanisms remain unclear.

Purpose of the Study:

• To investigate if prenatal dexamethasone exposure affects blood pressure similarly in male and female offspring.
• To determine if hypertension in offspring is associated with changes in renal tubular transporters or the renin-aldosterone system.

Main Methods:

• Pregnant rats received dexamethasone on specific gestational days.
• Offspring blood pressure, proteinuria, and albuminuria were assessed at different ages.
• Renal tubular transporter protein abundance, plasma renin, and serum aldosterone levels were measured.

Main Results:

• Prenatal dexamethasone increased blood pressure and induced proteinuria/albuminuria in male offspring at two and six months, but not in females.
• A transient increase in the sodium-potassium-two-chloride cotransporter was observed in males at two months.
• No significant alterations in other renal transporters, renin, or aldosterone were found.

Conclusions:

• Prenatal dexamethasone exposure leads to hypertension and kidney dysfunction specifically in male offspring.
• The observed hypertension is not consistently mediated by alterations in renal tubular transporters or the renin-aldosterone system.