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Comparative Study
. 1993 Feb;36(2):229-33.
doi: 10.1002/art.1780360214.

Increased levels of IgA antibodies to cytokeratin-18 and epidermal keratin in rheumatoid arthritis

A A Borg  1 , P T Dawes, D L Mattey
Affiliations
Comparative Study

Increased levels of IgA antibodies to cytokeratin-18 and epidermal keratin in rheumatoid arthritis

A A Borg et al. Arthritis Rheum. 1993 Feb.

Abstract

Objective: To investigate whether levels of antibodies to cytokeratin-18 (CK-18) and epidermal keratin (EPK) were raised in patients with rheumatoid arthritis (RA).

Methods: We measured antibodies to CK-18 and EPK in patients with RA and in patients with osteoarthritis (OA), as well as in normal control subjects by means of an enzyme-linked immunosorbent assay.

Results: IgA antibodies to both CK-18 and EPK were significantly increased in patients with RA compared with the controls and with patients with OA (P < 0.0001). No difference was noted in the levels of IgG or IgM antibodies to CK-18 or EPK between controls and patients with OA or RA.

Conclusion: Raised levels of IgA autoantibody to CK-18 and EPK may reflect damage to cytokeratin-containing cells (e.g., in synovial endothelium) and could be a useful disease marker in RA.

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