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Intracellular chromium reduction.

P Arslan1, M Beltrame, A Tomasi

  • 1Institute of General Pathology, University of Padova, Italy.

Biochimica Et Biophysica Acta
|October 22, 1987
PubMed
Summary
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This study demonstrates intracellular chromium reduction in rat thymocytes using electron paramagnetic (spin) resonance (EPR) spectroscopy. This reduction is crucial for chromate uptake and is inhibited by specific drugs and anion carrier inhibitors.

Area of Science:

  • Environmental Toxicology
  • Cell Biology
  • Biochemistry

Background:

  • Hexavalent chromium (Cr(VI)) uptake involves anion diffusion and intracellular reduction.
  • Intracellular reduction of Cr(VI) to Cr(III) is key for chromate accumulation.
  • Mechanisms of Cr(VI) transport and intracellular processing require further elucidation.

Purpose of the Study:

  • To provide direct evidence for intracellular chromium reduction in rat thymocytes.
  • To investigate the role of intracellular reduction in Cr(VI) uptake.
  • To identify factors influencing intracellular chromium reduction.

Main Methods:

  • Incubation of metabolically active rat thymocytes with chromate.
  • Electron paramagnetic (spin) resonance (EPR) spectroscopy to detect chromium species.

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  • Treatment with glutathione-depleting drugs (diethylmaleate, phorone) and an anion carrier inhibitor (4-acetamido-4'-isothiocyanatostilbene-2-2'-disulfonic acid).

    • Main Results:

    • EPR spectroscopy detected a paramagnetic chromium signal in chromate-incubated cells.
    • The signal persisted after washing and was abolished by glutathione-depleting drugs.
    • The signal was also abolished by the specific anion carrier inhibitor, confirming intracellular reduction.

    Conclusions:

    • Direct evidence for intracellular reduction of Cr(VI) in rat thymocytes is presented.
    • Intracellular reduction plays a significant role in facilitating chromate uptake.
    • The process is linked to cellular redox status and anion transport mechanisms.