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Ontogenetic aspects of thallium-induced nephrotoxicity in rats

D Appenroth1, S Tiller, S Gambaryan

  • 1Institute of Pharmacology and Toxicology, Friedrich Schiller University, Jena, Germany.

Journal of Applied Toxicology : JAT
|May 1, 1996
PubMed

Insights

Young rats show reduced thallium sulfate (Tl2SO4) kidney toxicity compared to adults. This difference in nephrotoxicity is linked to thallium concentration in renal tissue and Na+/K(+)-ATPase activity.

Area of Science:

  • Toxicology
  • Renal Physiology
  • Developmental Biology

Background:

  • Thallium sulfate (Tl2SO4) is a nephrotoxic agent.
  • Understanding age-dependent differences in heavy metal toxicity is crucial for risk assessment.
  • Developing rodent models are particularly sensitive to environmental toxicants.

Purpose of the Study:

  • To investigate the effects of Tl2SO4 on renal function in young rats (10- and 20-day-old).
  • To compare the nephrotoxicity of Tl2SO4 in young rats versus adult rats.
  • To explore the underlying mechanisms of thallium-induced nephrotoxicity in different age groups.

Main Methods:

  • Determination of glomerular filtration rate (GFR).
  • Measurement of urinary volume, electrolyte, and protein excretion.
  • Morphological investigations of renal tissues.
  • Assessment of Na+/K(+)-ATPase activity in rat renal tissues.

Main Results:

  • No morphological renal destructions were observed in 10- and 20-day-old rats, unlike in adult rats.
  • Renal functional changes were less pronounced in young rats compared to adults.
  • Lower thallium concentration in renal tissue may explain reduced nephrotoxicity in 10-day-old rats.
  • Decreased nephrotoxicity in 20-day-old rats could not be explained by lower thallium concentration alone.
  • Na+/K(+)-ATPase activity was implicated in thallium accumulation in renal tissue and indirect determinant of nephrotoxicity.

Conclusions:

  • Young rats exhibit lower susceptibility to Tl2SO4-induced nephrotoxicity compared to adult rats.
  • Age-dependent differences in renal handling of thallium and Na+/K(+)-ATPase activity play a role in modulating nephrotoxicity.
  • Further research is needed to fully elucidate the mechanisms of decreased nephrotoxicity in 20-day-old rats.

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