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Related Experiment Videos

Glomerular adaptation in uninephrectomized young rats.

G Celsi1, L Larsson, I Seri

  • 1Department of Pediatrics, St. Göran's Children's Hospital, Karolinska Institute, Stockholm, Sweden.

Pediatric Nephrology (Berlin, Germany)
|July 1, 1989
PubMed
Summary

Infant uninephrectomy in rats leads to increased glomerular filtration and ultrafiltration pressure, with glomerular surface area expanding by 60 days. However, hydraulic conductivity decreases by 60 days, indicating complex glomerular adaptation.

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Area of Science:

  • Nephrology
  • Pediatric Nephrology
  • Renal Physiology

Background:

  • Compensatory renal growth is crucial for maintaining kidney function after nephron loss, particularly when initiated in infancy.
  • Understanding glomerular adaptation mechanisms is key to addressing long-term renal health following early-life kidney injury or surgery.

Purpose of the Study:

  • To investigate glomerular adaptation during compensatory renal growth in rats uninephrectomized (Nx) or sham-operated (S) at 5 days of age.
  • To assess changes in afferent effective ultrafiltration pressure (PUF), glomerular filtration area, and hydraulic conductivity at 20 and 60 days post-operation.

Main Methods:

  • Uninephrectomy (Nx) or sham-operation (S) performed on postnatal day 5 in rats.
  • Assessment of single nephron glomerular filtration rate (SNGFR), afferent effective PUF (stop-flow method), glomerular filtration area, and glomerular hydraulic conductivity at 20 and 60 days.

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  • Rats were fed a normal protein diet throughout the study.

    • Main Results:

    • Significantly higher SNGFR and afferent effective PUF in Nx rats compared to S rats at both 20 and 60 days.
    • Glomerular filtration area was similar at 20 days but significantly greater in Nx rats by 60 days.
    • Glomerular hydraulic conductivity was similar at 20 days but significantly decreased in 60-day-old Nx rats compared to S rats.

    Conclusions:

    • Infant uninephrectomy induces significant compensatory glomerular hyperfiltration and increased ultrafiltration pressure.
    • While glomerular surface area expands to accommodate increased filtration, a decrease in hydraulic conductivity occurs by 60 days.
    • These findings highlight complex, age-dependent glomerular adaptations following early-life nephron loss.