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Circulating natural killer cells in retired asbestos cement workers
P Froom1, N Lahat, E Kristal-Boneh
1Occupational Health and Rehabilitation Institute, Raanana, Israel. paulf@trendline.co.il
Journal of Occupational and Environmental Medicine
|February 1, 2000
Summary
Asbestos exposure impairs natural killer (NK) cell effectiveness, reducing their activity while increasing their numbers. This study found a higher risk of low NK cell activity per cell in asbestos-exposed workers.
Area of Science:
- Immunology
- Occupational Health
- Environmental Health
Background:
- The impact of asbestos exposure on immune function, specifically natural killer (NK) cells, remains unclear.
- Asbestos is a known carcinogen linked to lung diseases, but its effects on cellular immunity require further investigation.
Purpose of the Study:
- To investigate the relationship between past asbestos exposure and NK cell number and activity.
- To determine if asbestos exposure affects the functional capacity of NK cells.
Main Methods:
- A comparative study involving 1052 retired asbestos workers and 100 healthy age-matched controls.
- Measurement of NK cell number and activity in both groups, with workers having no symptomatic lung disease or cancer.
- Analysis of the odds ratio for low NK activity per cell in relation to asbestos exposure duration.
Main Results:
- Asbestos-exposed workers exhibited significantly decreased NK cell activity and increased NK cell numbers compared to controls.
- A 10.8-fold higher odds ratio for low NK activity per cell was observed in exposed workers.
- Asbestos exposure exceeding 10 years was associated with an increased risk of diminished NK cell activity per cell.
Conclusions:
- Past asbestos exposure is linked to reduced NK cell effectiveness.
- Asbestos exposure leads to a compensatory increase in circulating NK cell numbers.
- These findings suggest a potential mechanism by which asbestos may compromise immune surveillance.