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Experimental folic acid nephropathy.

M Fink1, M Henry, J D Tange

  • 1Department of Pathology, University of Melbourne.

Pathology
|April 1, 1987
PubMed
Summary
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Folic acid causes kidney damage in rats through direct toxicity and obstruction. Sodium bicarbonate pretreatment reduced obstruction but did not prevent direct renal epithelial cell injury.

Area of Science:

  • Nephrology
  • Toxicology
  • Pharmacology

Background:

  • Folic acid administration can lead to kidney damage.
  • The mechanisms of folic acid-induced nephrotoxicity, including obstructive and direct cellular effects, require further elucidation.

Purpose of the Study:

  • To differentiate between the obstructive and direct nephrotoxic effects of folic acid in a rat model.
  • To investigate the role of urinary pH modulation in mitigating folic acid-induced kidney injury.

Main Methods:

  • Rats received intravenous folic acid after pretreatment with either ammonium chloride (NH4Cl) or sodium bicarbonate (NaHCO3).
  • Kidney weight, urine output, and histological examination of renal tissues were assessed to evaluate damage and folic acid deposition.

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Main Results:

  • Ammonium chloride pretreatment did not alter folic acid's effects and led to droplet accumulation in papillary collecting ducts.
  • Sodium bicarbonate pretreatment reduced folic acid deposition, lessened kidney weight increase, induced polyuria, and decreased interstitial proliferation, but proximal tubule damage persisted.
  • These findings suggest direct nephrotoxicity independent of intraluminal obstruction.

Conclusions:

  • Folic acid exerts direct nephrotoxic effects on renal tubular epithelium, distinct from obstructive damage.
  • Renal injury induced by folic acid occurs at multiple nephron levels, indicating a complex toxicological profile.