Abstract
Two types of 47 kDa antigen specifically recognized by sera from rheumatoid arthritis (RA) patients were isolated from the membrane fraction of a human chondrosarcoma-derived chondrocytic cell line (HCS-2/8) by a 2-step procedure: preparative SDS-PAGE and reverse-phase HPLC. An N-terminal amino acid sequence in one of the 47 kDa antigens, named RA-A47, had 81% homology to that deduced from the DNA sequence of thecolligingene which is reported as humanhsp47gene, and 100% homology to that deduced from the DNA sequence ofcolligin-2gene, a homologue ofcolligin.The RA-A47 cross-reacted with a monoclonal antibody raised against chick heat shock protein (Hsp) 47 and bound to gelatin. The expression of thera-a47gene was enhanced by heat shock treatment and TGF-β stimulation. These findings suggest that RA-A47 is a Hsp47-like protein, presumably the product of thecolligin-2gene, and that a collagen-specific molecular chaperone(s) such as Hsp47 and/or RA-A47 is involved in cartilage destruction in RA.
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