Related Experiment Videos
Histocompatibility antigens in a population based silicosis series
K Kreiss1, J A Danilovs, L S Newman
1National Jewish Center for Immunology and Respiratory Medicine, University of Colorado School of Medicine, Denver.
British Journal of Industrial Medicine
|June 1, 1989
Summary
Genetic factors like Human Leukocyte Antigen (HLA) B44 and A29 are linked to silicosis susceptibility. This study found higher prevalence of these HLA types in silicotic individuals, suggesting a genetic predisposition to the lung disease.
Area of Science:
- Immunogenetics
- Occupational Lung Diseases
- Environmental Health
Background:
- Silicosis susceptibility varies, suggesting genetic and immune factors.
- Human Leukocyte Antigens (HLA) influence immune responses and may indicate genetic predisposition.
- Previous hypotheses linked certain HLA antigen groups to silicosis risk.
Purpose of the Study:
- To investigate the association between specific Human Leukocyte Antigen (HLA) types and silicosis.
- To identify potential genetic markers for silicosis susceptibility.
- To explore correlations between HLA types and clinical manifestations of silicosis.
Main Methods:
- Population-based study in Leadville, Colorado, identifying 49 silicotic subjects from chest radiographs.
- Collected data on symptoms, occupational history, and blood samples for HLA typing (A, B, DR, DQ).
- Assayed antinuclear antibody, immune complexes, immunoglobulins, and rheumatoid factor.
Main Results:
- Silicotic subjects showed significantly higher prevalence of HLA-B44 (45%) and HLA-A29 (20%) compared to the reference population.
- No significant differences were found in D-region antigen frequencies.
- HLA-B44 positivity was associated with older age at diagnosis and less dyspnea, while HLA-A29 positivity correlated with abnormal IgA levels and higher immune complexes.
Conclusions:
- This study provides the first evidence of significant excesses of specific HLA antigens (B44 and A29) in silicotic patients.
- These findings support the hypothesis of genetic susceptibility to silicosis, particularly involving HLA-B44 and HLA-A29.
- Specific HLA types may influence disease presentation and immune alterations in silicosis.