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Neonatal dexamethasone administration causes progressive renal damage due to induction of an early inflammatory

Yan Liu1, Harry van Goor, Rick Havinga

  • 1Center for Liver, Digestive, and Metabolic Diseases, Laboratory of Pediatrics, University Medical Center Groningen, University of Groningen, Hanzeplein 1, 9713 GZ Groningen, The Netherlands.

American Journal of Physiology. Renal Physiology
|February 1, 2008
PubMed

Insights

Neonatal dexamethasone (DEX) exposure in rats causes long-term kidney damage, leading to renal failure later in life. This early inflammatory trigger results in progressive fibrosis and kidney deterioration.

Area of Science:

  • Nephrology
  • Developmental Biology
  • Pharmacology

Background:

  • Glucocorticoids (GCs) are crucial for preventing chronic lung disease in premature infants.
  • Early-life GC exposure may negatively impact kidney function and lead to later-life hypertension.
  • Neonatal dexamethasone (DEX) is a commonly used GC in clinical settings.

Purpose of the Study:

  • To investigate the long-term effects of neonatal dexamethasone (DEX) administration on renal function and morphology in rats.
  • To determine the underlying mechanisms, including inflammation and fibrosis, contributing to DEX-induced kidney damage.

Main Methods:

  • Male rats received DEX or saline (control) during the first 3 days of life.
  • A time-course study assessed renal function, blood pressure, growth, and gene expression from day 2 to 32 weeks.
  • Histological analysis was performed to evaluate renal morphology and fibrosis.

Main Results:

  • Neonatal DEX exposure caused persistent growth retardation and severe renal damage, leading to premature death by 50 weeks.
  • Progressive proteinuria, increased systolic blood pressure, elevated alpha-SMA, and fibrosis were observed from 8 weeks onwards in DEX-treated rats.
  • DEX induced early renal inflammation (TNF-alpha, MCP-1) and macrophage infiltration, followed by sustained TGF-beta elevation and pro-fibrotic changes.

Conclusions:

  • Neonatal DEX administration in rats results in significant, long-term renal dysfunction and failure.
  • Early inflammatory processes triggered by DEX contribute to a persistent pro-fibrotic response, causing progressive kidney deterioration.
  • These findings highlight potential risks of early-life GC exposure on kidney development and long-term health.

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