Spontaneous thyroiditis in the obese strain of chickens. IV. The effect of thymectomy and thymo-bursectomy on the development of the disease.

G. Wick,J. Kite,E. Witebsky

Published 1970 in Journal of Immunology

ABSTRACT

By means of radioimmunoelectrophoresis and radioelectrophoresis, thyroxinebinding antibodies were demonstrated on one or several occasions in about 16% of obese strain (OS) chickens, but not in normal White Leghorn chickens. Thyroxine antibodies were generally demonstrated at a later time than hemagglutinating thyroglobulin antibodies. By means of absorption experiments, evidence was obtained that thyroxine is present as an antigenic determinant on the chicken thyroglobulin molecule. Thyroxine-binding antibodies occurred in greater frequency in sera with higher hemagglutinating antibody titers. Thyroxine-binding antibodies were present in 22% of chickens with moderate thyroid infiltration and residues of functioning thyroid tissue but only in 9% of chickens with total or almost total destruction of the thyroid tissue. Intravenous injection of OS sera with thyroxine-binding antibodies into normal chicken embryos caused an increase of the mean thyroid follicle diameter. This was explained as due to hypophyseal feedback after binding and inactivation of the thyroxine.

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