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Updated: Jan 24, 2026

Methods for Analyzing the Impacts of Natural Uranium on In Vitro Osteoclastogenesis
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Uranium Effect on Osteocytic Cells In Vitro.

Lucile Hurault1, Gaelle Creff2, Agnès Hagège3

  • 1UMR E-4320 TIRO-MATOs CEA/DRF/BIAM, Université Nice Sophia Antipolis, Université Côte d'Azur 06107 Nice.

Toxicological Sciences : an Official Journal of the Society of Toxicology
|May 24, 2019
PubMed
Summary
This summary is machine-generated.

Natural uranium (U(VI)) negatively impacts bone health by affecting osteocytes, the most abundant bone cells. Even low U(VI) exposure impairs osteocyte mineralization and function, potentially disrupting bone remodeling.

Keywords:
autophagymineralizationnatural uraniumosteocytes

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Area of Science:

  • Environmental Science
  • Toxicology
  • Bone Biology

Background:

  • Natural uranium (U(VI)) is a prevalent environmental radionuclide that targets the skeleton.
  • Previous studies reported U(VI) toxicity in osteoblasts and osteoclasts, key bone remodeling cells.
  • Osteocytes (OST), the most numerous and longest-lived bone cells, are embedded in bone matrix and susceptible to long-term uranium exposure.

Purpose of the Study:

  • To investigate the effects of U(VI) on osteocytes (OST), focusing on their cytotoxicity, mineralization function, and cellular responses.
  • To determine the impact of chronic low-dose U(VI) exposure on osteocyte function and gene expression.
  • To characterize the uranium speciation within osteocytes upon exposure.

Main Methods:

  • Cytotoxicity assays to determine the U(VI) cytotoxicity index in OST.
  • Assessment of OST mineralization function under chronic U(VI) exposure.
  • Gene expression analysis to identify molecular pathways affected by U(VI).
  • Extended X-ray absorption fine structure (EXAFS) spectroscopy to analyze uranium speciation.

Main Results:

  • Osteocytes exhibit a higher U(VI) cytotoxicity index (~730 µM) compared to osteoblasts and osteoclasts.
  • Chronic exposure to U(VI) as low as 5 µM significantly reduced OST mineralization function.
  • U(VI) exposure altered OST differentiation pathways and triggered autophagy.
  • EXAFS analysis confirmed the formation of an uranyl phosphate phase within OST, similar to Autunite.

Conclusions:

  • Osteocytes' mineralization function is sensitive to U(VI) exposure, even at low concentrations (5 µM).
  • Prolonged U(VI) exposure may disrupt the crucial role of osteocytes in bone remodeling.
  • Uranium speciation in OST involves the formation of uranyl phosphate, impacting cellular processes.