Summary
Cells binding anti-bovine TSH β serum were found exclusively in the rostral lobe of the adenohypophysis of the drake using the peroxidase-antiperoxidase complex unlabelled antibody method. The specificity of the binding of the anti-serum to TSH cells was established by relating the morphology and relative abundance of immunochemically stained cells to the TSH content of the adenohypophysis after experimentally altering the activity of the pituitary-thyroid axis. The TSH activity of the adenohypophysis was assessed indirectly, by the weight of the thyroid glands, and directly, by bioassay. As determined by bioassay, the TSH content of the rostral lobe of the adenohypohysis was much greater than that of the caudal lobe. Compared with control drakes, immunochemically stained cells in birds fed a goitrogen, methimazole, seemed to be enlarged and were closer together, while the stained cells in drakes injected with thyroxine were shrunken and less intensely stained. The TSH content of the adenohypophysis was increased in drakes fed methimazole. Castration did not alter the TSH content of the adenohypophysis or change the morphology of immunochemically stained cells. These observations suggest that in the drake: 1) anti-bovine TSH β serum binds specifically to TSH cells; 2) the TSH cells occur in the rostral and not in the caudal lobe of the adenohypophysis; and 3) the activity of TSH cells is not inhibited by the feedback effects of gonadal steroids.
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We thank Dr. L.E. Reichert Jr. and the National Institute of Arthritis, Metabolic and Digestive Diseases for the gift of ovine TSH and Mr. R. Wilkie for technical assistance. We are grateful to Dr. M.F. El Etreby, Professor B.K. Follett, Dr. C.G. Scanes, Dr. J. Seth and Dr. J.G. Pierce for gifts of immunochemicals
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Sharp, P.J., Chiasson, R.B., El Tounsy, M.M. et al. Localization of cells producing thyroid stimulating hormone in the pituitary gland of the domestic drake. Cell Tissue Res. 198, 53–63 (1979). https://doi.org/10.1007/BF00234834
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DOI: https://doi.org/10.1007/BF00234834