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THE EFFECT OF ESTRADIOL ON THE CELL KINETICS IN THE UTERINE AND CERVICAL EPITHELIUM OF NEONATAL MICE

The effect of estradiol‐17β on the length of the various phases of the cell cycle was studied in the neonatal mouse uterine, and cervical epithelium. A double labelling method was used, and in addition labelled mitoses were counted. In the uterus proper, estradiol shortens the length of the total cell cycle, Tc, from 17‐9 hr to 15‐7 hr, and the duration of S phase, Ts, from 6–7 to 5‐1 hr 6 hr after estradiol treatment. 12 hr after estradiol treatment, Tc is shortened to 7‐4 hr and Ts to 4–5 hr. The shortening of Tc at 12 hr is mainly due to an effect on TG1, which is shortened from 8–55 hr in untreated animals to 1–8 hr in estradiol treated animals.