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Myosin autoantibodies detected by immunofluorescence
Clinical and Experimental Immunology
|April 1, 1977
Summary
Autoantibodies targeting muscle myosin proteins were identified in patient sera, revealing distinct types that react with smooth, skeletal, or cardiac muscles. These findings highlight the diversity of myosin autoantibodies and their potential cross-reactivity across different muscle tissues.
Area of Science:
- Immunology
- Molecular Biology
- Biochemistry
Background:
- Autoantibodies against muscle components can be associated with various muscle disorders.
- Myosins, crucial contractile proteins, exist in different forms across various muscle types.
Purpose of the Study:
- To investigate the presence and characteristics of autoantibodies targeting striated and smooth muscle myosins.
- To understand the specificity and cross-reactivity of these myosin autoantibodies.
Main Methods:
- Indirect immunofluorescence assays were used to detect autoantibodies.
- Absorption studies with purified human, rabbit, and chicken muscle contractile proteins, including myosin and heavy meromyosin fragments, were performed to confirm specificity.
Main Results:
- Myosin autoantibodies were rare in patients with muscle disorders, with only one case of anti-myosin activity found in Coxsackie viral pericarditis, reacting with cardiac and skeletal muscle type 1 fibers.
- Two distinct types of smooth muscle myosin autoantibodies were identified: one specific to smooth muscle myosin, and another cross-reactive with skeletal and cardiac muscle, as well as cytoplasmic myosin in various organs.
- Cross-reacting antibodies were absorbed by both smooth and skeletal myosin, indicating shared epitopes on the heavy meromyosin fragment.
Conclusions:
- The diversity of myosin autoantibodies reflects the heterogeneity of myosin proteins in mammalian tissues.
- Cross-reacting myosin autoantibodies suggest common antigenic determinants within the heavy meromyosin fragment across different myosin types.