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Autoradiography of tritiated thymidine labeled anterior pituitary cells in propylthiouracil treated rats.

Mature male rats weighing 190–230 g were treated for 3–24 days with 2.5 mg of propylthiouracil (PTU) ip every 12 hr. During the last 48 hr of this treatment they were injected with 4 doses of tritiated thymidine (0.5 µCi per g body weight per dose). Periodic acid- Schiff(PAS)-stained sections of their pituitary glands were then subjected to autoradiography. A 3-foldincr ase in labeling index and a 6-fold increase in mitotic index was found after 15 days of treatmentwith PTU. Most of the labeled cellswere chromophobic without the morphological characteristics ofthyroidectomy cells, suggesting that they arose from potentially thyrotropic cells, not involved at that time in the hypersecretion of TSH. (Endocrinology 87: 1113,1970)