Circulating immune complexes in asbestos workers

Our plain-English summary of Circulating immune complexes in asbestos workers, by J.J. Zone, W.N. Rom (Environmental Research, 1985).

The study

• Authors: J.J. Zone, W.N. Rom
• Journal: Environmental Research
• Published: 1985;37(2):383-9
• Cited by: 16 articles, as counted by NIH iCite
• Read it: PubMed · Publisher

Abstract

Circulating immune complexes, rheumatoid factor, and antinuclear antibodies were evaluated in 25 asbestos insulation workers and 32 brick mason controls. There were 10 asbestos workers with radiographic parenchymal or pleural changes, consistent with their asbestos exposure. There were no differences in antinuclear antibodies or rheumatoid factor between asbestos workers and controls. The asbestos workers had significantly increased levels of IgG and IgA circulating immune complexes. There was a significant correlation between IgA circulating immune complexes and radiographic changes.

In plain English

This University of Utah study compared blood immune markers in 25 male asbestos insulation workers and 32 brick masons who served as controls. The article does not name the asbestos fiber types. The insulation workers had a mean of 27.0 years of exposure. Ten of the 25 had pleural abnormalities on chest X-ray, and six of these also had parenchymal fibrosis. The researchers measured IgG and IgA circulating immune complexes (antibodies bound to their targets, carried in the blood). They also tested for antinuclear antibodies and rheumatoid factor. Overall, the insulation workers had significantly higher IgG immune complexes (P < 0.05) and IgA immune complexes (P < 0.001) than the brick masons. Among the insulation workers, IgA immune-complex levels were associated with an abnormal chest X-ray (P = 0.025); IgG immune-complex levels were not. No differences in antinuclear antibodies or rheumatoid factor were seen between the groups. The authors concluded that the findings suggest a possible relationship between IgA immune complexes and disease activity. They noted the group was small and select with minimal disease, and that IgA complexes are not specific to asbestos exposure.

We wrote this plain-English summary from the full article with the help of AI, and a second AI model checked each sentence against the article. It is not the authors' wording; the abstract and the article are their own account.

What the study did and found

• Design: Comparison of blood tests and chest X-rays in asbestos-exposed insulation workers versus a control group of brick masons (cross-sectional comparison)
• Who was studied: 25 Caucasian male asbestos insulation workers (mean age 57.7 years) and 32 Caucasian brick masons as controls (30 males, 2 females; mean age 46.4 years), studied at the University of Utah Medical Center
• Exposure: Asbestos exposure in the insulation trades, with a mean exposure duration of 27.0 years; fiber types not specified
• Main results:
  • Ten of 25 asbestos workers had pleural abnormalities on chest X-ray, and six of these had parenchymal fibrosis. Only one brick mason had an abnormal chest X-ray.
  • As a group, the asbestos workers had significantly higher IgG circulating immune complexes than the brick masons (P < 0.05)
  • Only 4 of 25 asbestos workers had IgG immune complex levels above the normal range, and IgG immune complex levels were not correlated with an abnormal chest X-ray (P > 0.1)
  • As a group, the asbestos workers had significantly higher IgA circulating immune complexes than the brick masons (P < 0.001); 8 of 25 asbestos workers were above the normal range
  • Among asbestos workers, IgA immune complex levels were positively associated with an abnormal chest X-ray, comparing those with and without X-ray changes (P = 0.025)
  • Antinuclear antibodies were positive in 3 of 25 asbestos workers, which was not significantly different from the brick mason controls
  • Rheumatoid factor was positive in 3 of 25 asbestos workers and 2 of 32 brick masons; all three positive asbestos workers had radiographic abnormalities
• The authors' conclusion: The authors concluded that higher IgA and IgG immune complexes in the asbestos workers, and the association between abnormal chest X-rays and IgA immune complexes, suggest a possible relationship between IgA immune complexes and disease activity
• Limitations the authors state:
  • The study population was small and select, with minimal asbestos-related disease despite long exposure
  • The control group was younger than the asbestos workers
  • Too few subjects had positive antinuclear antibodies or rheumatoid factor to evaluate their relationship with immune complexes
  • Showing a cause-and-effect relationship would require testing of fresh lung tissue
  • IgA immune complexes occur in other disorders and are not specific to asbestos exposure
  • The study did not evaluate the body's clearance of immune complexes

Topics

Medical terms in this study, explained in our Lexicon: Insulator, Asbestos Exposure.

Related studies

• Circulating rheumatoid and antinuclear factors in asbestos workers — M. Turner-Warwick, W.R. Parkes (1970)
• Immune response in shipyard workers with x ray abnormalities consistent with asbestos exposure — H. Anton-Culver, B.D. Culver, et al. (1988)
• Immune Status of Workers with Professional Risk of Being Affected by Chrysotile Asbestos in Kazakhstan — S. Koigeldinova, A. Alexeyev, et al. (2022)
• Immune responses in asbestos-exposed individuals — D.L. Morris, S.D. Greenberg, et al. (1985)
• Far-reaching consequences of high level air pollution on the developing immune system — T. Turnovska, I. Sirakova, et al. (2001)
• Lung function in relation to radiographic changes in asbestos workers — S. Zedda, G. Aresini, et al. (1973)

Browse more research in Environmental Research, or return to medical research.