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Prenatal dexamethasone causes oligonephronia, sodium retention, and higher blood pressure in the offspring

G Celsi1, A Kistner, R Aizman

  • 1Institute of Women's and Child's Health, Karolinska Institute, Stockholm, Sweden.

Pediatric Research
|September 4, 1998
PubMed

Insights

Maternal exposure to high glucocorticoid levels during pregnancy can impair fetal kidney development, leading to adult hypertension in offspring. This occurs even when kidney size normalizes, due to glomerular damage and sodium retention.

Area of Science:

  • Nephrology
  • Developmental Biology
  • Endocrinology

Background:

  • Low birth weight is linked to increased adult hypertension risk.
  • Mechanisms underlying this link require further investigation.

Purpose of the Study:

  • To investigate the impact of maternal glucocorticoid exposure on fetal renal development and adult hypertension.
  • To explore the role of dexamethasone versus hydrocortisone in programming hypertension.

Main Methods:

  • Induction of fetal growth retardation in rats using maternal dexamethasone treatment.
  • Assessment of pup kidney development, glomerular number, and cell mitosis.
  • Measurement of adult body weight, blood pressure, glomerular filtration rate (GFR), albuminuria, and sodium balance.

Main Results:

  • Dexamethasone-exposed pups had lower birth weight, kidney weight, and fewer glomeruli.
  • Adult offspring exposed to dexamethasone exhibited significantly higher blood pressure, lower GFR, and increased albuminuria.
  • Maternal hydrocortisone treatment did not result in abnormal fetal development or adult hypertension.

Conclusions:

  • High maternal glucocorticoid levels during gestation impair renal development, predisposing offspring to arterial hypertension.
  • Glomerular damage and impaired sodium handling contribute to hypertension development, despite normalization of renal mass.
  • Placental metabolism of glucocorticoids is crucial in preventing these adverse effects.

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