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Decrease in laminin content and protein excretion rate after five sixths nephrectomy and low-dose irradiation in the

Marina Aunapuu1, Andres Arend, Ivo Kolts

  • 1Department of Anatomy, University of Tartu, Ravila 19, 51014 Tartu, Estonia. mariaun@ut.ee

Annals of Anatomy = Anatomischer Anzeiger : Official Organ of the Anatomische Gesellschaft
|May 6, 2004
PubMed
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Low-dose irradiation, particularly 3 Grey, reduced protein excretion in rat remnant kidneys, a model for chronic renal failure. This suggests moderate irradiation may benefit kidney health by suppressing harmful sclerotic processes.

Area of Science:

  • Nephrology
  • Radiation Biology
  • Experimental Pathology

Background:

  • The rat remnant kidney model (5/6 nephrectomy) mimics chronic renal failure, exhibiting focal segmental glomerulosclerosis, tubular alterations, and glomerular basement membrane thickening.
  • Low-dose irradiation is hypothesized to mitigate sclerotic processes in renal failure models.

Purpose of the Study:

  • To investigate the impact of low-dose irradiation (1 or 3 Grey) on laminin distribution and urine protein excretion in a rat remnant kidney model.
  • To assess the potential renoprotective effects of moderate irradiation in chronic kidney disease.

Main Methods:

  • Twenty-four male Wistar rats underwent 5/6 nephrectomy and were divided into nephrectomized, nephrectomized with 1 Grey irradiation, and nephrectomized with 3 Grey irradiation groups.

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  • A healthy control group was included.
  • Animals were analyzed at 2, 4, and 8 weeks post-intervention using laminin immunohistochemistry and urine protein excretion measurements.

    • Main Results:

    • Laminin staining was present in tubular and glomerular basement membranes, with decreased intensity at week 2, particularly after irradiation, followed by an increase at week 8.
    • Irradiation with 3 Grey significantly reduced protein excretion compared to nephrectomized controls at all time points.
    • A 1 Grey dose of irradiation showed no significant effect on protein excretion.

    Conclusions:

    • Moderate low-dose irradiation (3 Grey) demonstrates beneficial effects on the rat remnant kidney, evidenced by decreased proteinuria.
    • Laminin in basement membranes may not be the primary determinant of membrane permeability in this model.
    • Low-dose irradiation warrants further investigation for its therapeutic potential in chronic renal failure.