© 1990 British Society for Rheumatology
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DIVERSITY OF ANTIBODIES TO TYPE II COLLAGEN IN PATIENTS WITH RHEUMATOID ARTHRITIS: DETECTION BY BINDING TO
-CHAINS AND TO CYANOGEN BROMIDE PEPTIDES
0Departments of Rheumatology Oxford Road, Manchester
*Departments of Biochemistry and Molecular Biology, University of Manchester Medical School Oxford Road, Manchester
Correspondence to:
1Correspondence to Dr K. Morgan, Department of Rheumatology, University of Manchester Medical School, Oxford Road, Manchester M13 9PT.
Antibodies to denatured type II collagen were detected in the sera of a group of patients with rheumatoid arthritis by ELISA and by immunoblotting.
The antibodies were further examined by immunoblotting against cyanogen-bromide derived peptides of type II collagen. The majority of sera reacted against only one or two peptides and antibodies to the CB-l0 and CB-11 peptides were those most commonly found. However, some sera reacted with up to eight peptides, indicating that patients had antibodies to differing combinations of epitopes on type II collagen.
Examination of sequential serum samples from an individual patient showed that there were changes in the class of antibody produced to type II collagen and that antibodies to different peptides were preferentially produced at different times in the course of the disease.
Thus there was a selective response to different peptides of type II collagen not only between patients but also at different times in the course of disease in the same patient.
KEY WORDS: Antibodies, Type XI collagen, Type II collagen, Western blotting, ELISA, Sequential results
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