Abstract

We measured IgAl and IgA2 subclass antibody levels against human type I, II, III and IV collagens in patients with ankylosing spondylitis (AS) by enzyme linked immunosorbent assay (ELISA). Significant elevations of IgAl antibodies against type II collagen (p<0.01) and IgA2 antibodies against type I (p<0.001), III (p<0.001), and IV (p<0.01) collagens were observed in AS patients compared with those of healthy controls. These findings suggest that serum IgA antibodies against type I, III and IV collagens were mainly produced in secretory lesions in AS patients.

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