Abstract
In the present paper, we reported the induction of idiotypic antiserum against anti-thyroglobulin antibody from the serum of a patient with chronic thyroiditis. Antisera were raised against IgG F (ab')2 of anti-thyroglobulin antibodies obtained from 5 patients with chronic thyroditis. After adequate absorptions, only one antiserum was rendered idiotype-specific, as assayed by solid phase radioimmunoassay.
Specificity of the idiotypic antiserum was examined by the following ways.
1) The idiotypic antiserum reacted with F (ab')2 of anti-thyroglobulin antibody from patient NAG, but neither F (ab')2 without anti-thyroglobulin antibody from NAG nor F (ab')2 of antithyroglobulin antibody obtained from other 4 patients reacted with the idiotypic antiserum.
2) Binding of the idiotypic antiserum to NAG F (ab')2 of anti-thyroglobulin antibody was inhibited by NAG IgG and NAG IgG F (ab')2 with anti-thyroglobulin antibody but not by NAG F (ab')2 without anti-thyroglobulin antibody and pooled human IgG.
The reaction between anti-thyroglobulin antibody and idiotypic antiserum was inhibited by thyroglobulin till 45 percent of control. No cross reaction was detected between the idiotypic antiserum and different IgG obtained from 9 patients with chronic thyroiditis.
