[Effect of hydrocortisone on the mitotic cycle of epithelial cells in the mouse pylorus]

It was shown with the aid of thymidine-H3 that the mitotic cycle of mucous-forming cells (superficial epithelial mucosal cells of the neck) of the stomach pyloric glands of mice lasted 13.5 hrs (G1+1/2M = 7.6 hrs, S = 5.3 hrs; G2+1/2M = 0.6 hrs). With the administration of a physiological dose of hydrocortisone (0.1 mg) the duration of the mitotic cycle of mucous-forming cells of the stomach pyloric glands increased by 6.7 hrs (G1+1/2M = 11.6 hrs, S = 7.8 hrs; G2+1/2M = 0.8 hrs). A high dose of the hormone had a similar effect and increased the presynthetic period to 12.9 hours and the postsynthetic one--to 2.3 hours.