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Comparative immunochemical analysis of five Thermoactinomyces strains
J K Ylönen1, T H Ojanen, H J Jägerroos
1Department of Clinical Microbiology, University of Kuopio, Finland.
International Archives of Allergy and Applied Immunology
|January 1, 1989
Summary
This study compared antigens from Thermoactinomyces vulgaris and Thermoactinomyces candidus, identifying a common 55 kilodalton antigen in farmer's lung patient sera, crucial for understanding hypersensitivity pneumonitis.
Area of Science:
- Microbiology
- Immunology
- Biochemistry
Background:
- Farmer's lung is a hypersensitivity pneumonitis caused by inhaled thermophilic actinomycetes.
- Thermoactinomyces vulgaris and Thermoactinomyces candidus are key etiological agents.
- Understanding the antigenic structures is vital for diagnosis and treatment.
Purpose of the Study:
- To compare the antigen structures of Thermoactinomyces vulgaris and Thermoactinomyces candidus.
- To identify specific antigens recognized by farmer's lung patient sera.
- To investigate cross-reactivity between different strains.
Main Methods:
- Sodium dodecyl sulfate-polyacrylamide gel electrophoresis (SDS-PAGE) and silver staining for antigen separation.
- Immunoblotting with specific antisera and patient sera on nitrocellulose membranes.
- Immunodiffusion and crossed immunoelectrophoresis for cross-reactivity analysis.
Main Results:
- Protein components between 50 and 60 kilodaltons (kDa) were identified as the most immunogenic.
- A common antigen at 55 kDa was recognized by all farmer's lung patient sera tested.
- Cross-reactions were observed between the studied strains, indicating shared antigenic determinants.
Conclusions:
- A 55 kDa antigen is a significant common determinant in Thermoactinomyces species relevant to farmer's lung.
- The findings contribute to the immunological characterization of hypersensitivity pneumonitis.
- Further research can utilize these findings for improved diagnostic tools.