Isolation and characterization of a cartilage-specific membrane antigen (CH65) : comparison with cytokeratins and heat-shock proteins

作者: W. Van Eden , S. H. E. Kaufmann , A. Schulmeister , A. Wand-Württenberger , H. Bang

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摘要: We report the isolation and characterization of a 65,000 MW chondrocyte autoantigen (CH65) which may be involved in rheumatoid arthritis. This chondrocyte-specific antigen reacted with sera from patients arthritis (RA). CH65 did not cross-react polyclonal antibody raised against microbial heat-shock protein (hsp) 65, anti-human hsp 65 monoclonal antibodies (mAb) (LK1 LK2), anti-microbial mAb (IA10, IIC8 WTB-78H1) anti-cytokeratin 8, 18, 19 (NCL5D3MAb). could purified chicken membranes by ammonium sulphate precipitation novel electro-gel-filtration method. The amino acid analysis yielded an unusually high degree glycine, serine asparagine residues. internal sequence obtained tryptic digestion revealed homologies cytokeratin family. Despite these homologies, lacked immunological cross-reactivity commercial antibodies. Mice generated (C6) were used to identify as tissue-specific constitutive membrane chondrocytes. Sera RA cross-reacted CH65. stress or (hsp 65), implicated development experimental clinical arthritis, showed no Western blots. These findings suggest that represent interesting cartilage-specific new RA. availability this form specific offer useful tools research.

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