Abstract
Nuclear and nuclear matrix proteins of HeLa cells were separated by sodium dodecyl sulfate polyacrylamide gel electrophoresis, and subsequently transferred onto nitrocellulose. Antibodies present in sera of patients with primary biliary cirrhosis and autoimmune chronic active hepatitis reacted with some of the blotted proteins. The antibodies were mainly directed against chromatin-associated proteins and protein constituents of discrete RNP particles. In addition, antibodies found in autoimmune liver disease sera detected a hitherto undescribed nuclear protein of 54 kD, and a nuclear matrix protein of approximately 150 kD. Antibodies recognizing a nuclear 25 kD doublet apparently constituted a marker antibody for autoimmune liver disease. Those directed at the 17 kD centromere protein were associated with the primary biliary cirrhosis-related CREST syndrome, while those recognizing La antigen were related to cases of sicca syndrome associated with autoimmune liver diseases.
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