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Binding sites to the beta chain of thyroid stimulating hormone (TSH) were localized in pituitaries of thyroidectomized rats. Immunocytochemical staining was observed in hypertrophied TSH cells ("thyroidectomy cells") and primarily located in dilated rough endoplasmic reticulum. Staining was also found on the few secretory granules and on some of the intracisternal granules. Some of the thyroidectomy cells stained intensely, while others exhibited very little staining. When thyroidectomized rats were treated with thyroxine 4 days before death, the TSH cells contained more secretory granules, and the intracisternal granules were larger and more numerous. L-thyroxine was 10 times as potent as D-thyroxine in promoting the build-up of granules. Both types of granules stained intensely.

An immunocytochemical study of TSH beta storage in rat thyroidectomy cells with and without D or L thyroxine treatment.