Antibodies to cytoskeletal proteins in sera of patients with angiographically assessed coronary artery disease.

Circulating autoantibodies to various components of the arterial wall have been reported in atherosclerosis. To examine the occurrence of autoantibodies to cytoskeletal proteins in coronary artery disease (CAD) we studied 56 patients with angiographically demonstrable CAD and compared them with 37 controls without CAD. Enzyme-linked immunosorbent assay (ELISA) was used to analyze the serum samples. In coronary patients, antibody absorbance values at least two standard deviations above the mean for the controls were considered positive. The following numbers of positive antibody absorbances were found in the group of 56 patients: actin IgG, 6 (10.7%); cytokeratin-18 IgG, 3 (5.4%), IgA, 2 (3.6%); myosin IgA, 11 (19.6%); desmin IgG, 13 (23.2%), IgM, 3 (5.4%); vimentin IgG, 2 (3.6%), IgM, 7 (12.5%), IgA, 6 (10.7%). The specificity of desmin IgG was tested with Western blotting against extracts of human internal mammary artery. The positive antibody absorbances to one or several cytoskeletal proteins in the patients were not found to correlate with the clinical symptoms of CAD. Our results suggest an association between autoantibodies to cytoskeletal proteins, particularly to those for desmin, with angiographically assessable CAD.