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Does occupational cobalt exposure determine early renal changes?

I Franchini1, M C Bocchi, C Giaroli

  • 1Laboratory of Industrial Toxicology, University of Parma, Italy.

The Science of the Total Environment
|June 30, 1994
PubMed
Summary
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Occupational cobalt (Co) dust exposure in hard-metal workers did not reveal significant subclinical renal effects. Kidney function markers remained comparable between exposed individuals and controls, suggesting cobalt is not a primary kidney target organ.

Area of Science:

  • Occupational Health
  • Toxicology
  • Nephrology

Background:

  • Occupational exposure to cobalt (Co) dust is prevalent in hard-metal manufacturing.
  • Potential subclinical renal effects from chronic cobalt exposure require investigation.

Purpose of the Study:

  • To assess subclinical renal effects in workers occupationally exposed to cobalt dust.
  • To evaluate early markers of renal dysfunction in relation to cobalt exposure.

Main Methods:

  • Cross-sectional study of 26 cobalt-exposed workers and 35 controls.
  • Interviews excluded subjects with pre-existing conditions or nephrotoxic exposures.
  • Measured urinary albumin, retinol-binding protein (RBP), beta 2-microglobulin (beta 2m), and tubular brush-border antigens.
  • Assessed exposure levels via ambient and biological monitoring.

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Main Results:

  • Prevalence of abnormal renal dysfunction markers was similar between cobalt-exposed workers and controls.
  • A shift towards higher beta 2-microglobulin values was observed in the exposed group, within the reference interval.
  • No correlation found between renal markers and cobalt exposure intensity or duration.

Conclusions:

  • Kidney function markers did not show significant abnormalities in cobalt-exposed workers compared to controls.
  • Findings suggest the kidney may not be a primary target organ for occupational cobalt exposure.
  • Further research with larger cohorts may be warranted to confirm these observations.