Circulating levels of mouse anti-collagen antibodies (auto-antibodies) and bovine anti-collagen antibodies was assessed by ELISA in serum collected from mice in the CIA model. A mouse anti-mouse type II collagen IgG antibody assay kit and mouse anti-bovine type II collagen IgG antibody assay kit was used, according to the manufacture's protocol (Chondrex Inc. Redmond, WA, USA). The antibody concentrations in the samples were calculated by comparison with the optical density (OD) values of standard anti-CII antibody (units/ml) provided in each of the assay kits as previously described (24 (link), 26 (link)).
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