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Pathophysiological changes in rat kidneys with partial ureteral obstruction since infancy.

B A Pettersson, A Aperia, G Elinder

    Kidney International
    |August 1, 1984
    PubMed
    Summary

    Partial ureteral obstruction in infant rats can either destroy nephrons or trigger adaptive growth to preserve kidney function. This study reveals how the kidneys respond to early-life urinary tract issues.

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    Area of Science:

    • Nephrology
    • Pediatric Urology
    • Renal Physiology

    Background:

    • Partial ureteral obstruction (PUO) in infancy can lead to significant kidney damage.
    • Understanding the compensatory mechanisms in the developing kidney is crucial for managing congenital urinary tract anomalies.

    Purpose of the Study:

    • To investigate the long-term effects of early-onset partial ureteral obstruction on renal structure and function in a rat model.
    • To determine if the developing kidney exhibits adaptive responses to maintain glomerular filtration rate (GFR) despite obstruction.

    Main Methods:

    • A partial ureteral obstruction model was created in 5-day-old rats, inducing mild (Hn (m)) or severe (Hn (s)) hydronephrosis.
    • Kidney weight, nephron count, mean arterial blood pressure (MAP), total GFR, single nephron GFR (SNGFR), and pressures were measured between 45-65 days of age.

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  • Comparisons were made with sham-operated and control rats.

    • Main Results:

    • Severe obstruction (Hn (s)) led to a 73% reduction in functioning nephrons and a 54% decrease in total GFR.
    • Mild obstruction (Hn (m)) preserved total GFR, with elevated SNGFR in remaining nephrons, suggesting compensatory growth.
    • Hypertension and reduced glomerular density were observed in the severe obstruction group.

    Conclusions:

    • Early-onset partial ureteral obstruction has profound effects on nephron mass and renal function.
    • The developing kidney can mount a compensatory response to maintain GFR, but severe obstruction leads to nephron loss and hypertension.
    • These findings highlight the potential for adaptive nephron growth in response to infant urinary tract obstruction.