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Updated: May 11, 2026

Methods for Analyzing the Impacts of Natural Uranium on In Vitro Osteoclastogenesis
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Uranium dynamics and developmental sensitivity in rat kidney.

Shino Homma-Takeda1, Toshiaki Kokubo, Yasuko Terada

  • 1Radiobiology for Children's Health Program, National Institute of Radiological Sciences, 4-9-1 Anagawa, Inage-ku Chiba, 263-8555, Japan. shino_ht@nirs.go.jp

Journal of Applied Toxicology : JAT
|April 27, 2013
PubMed
Summary

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Uranium exposure causes kidney damage, with younger rats showing higher mortality and unique sensitivities. Developing kidneys retain uranium longer, but adult kidneys exhibit more pronounced toxicity.

Area of Science:

  • Environmental toxicology
  • Developmental biology
  • Nephrology

Background:

  • Renal toxicity is a primary health concern following uranium exposure.
  • Children are especially vulnerable to uranium due to potential exposure through depleted uranium or contaminated groundwater.
  • Understanding age-dependent renal sensitivity to uranium is crucial for risk assessment.

Purpose of the Study:

  • To investigate the age-specific distribution and toxicity of uranium in developing rat kidneys.
  • To determine how age at exposure influences uranium accumulation, clearance, and apoptosis in renal tissues.
  • To identify unique sensitivities to uranium exposure in neonate, prepubertal, and adult rats.

Main Methods:

  • Subcutaneous administration of uranium acetate (UA) to male Wistar rats at different ages (7, 25, and 70 days).

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  • Quantification of renal uranium concentrations and assessment of uranium distribution using synchrotron radiation X-ray fluorescence.
  • Evaluation of uranium-induced apoptosis and cell loss in renal proximal tubules.

    • Main Results:

    • Renal uranium concentrations increased with both age at exposure and dose.
    • Younger rats showed reduced uranium clearance, with uranium persisting longer in their kidneys.
    • Apoptosis and cell loss in proximal tubules increased with exposure level, with prepubertal rats exhibiting unique sensitivity to higher doses and increased mortality.

    Conclusions:

    • Age at exposure and exposure level are critical determinants of uranium renal toxicity.
    • Developing kidneys may retain uranium longer, but adult kidneys show more significant toxicity.
    • Prepubertal rats' heightened sensitivity to uranium-induced lethality may be linked to apoptosis in regenerating tubules.