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To confirm the utility of the bromodeoxyuridine (BrdU) labeling method in the study of cell proliferation in mouse uterine tissues, changes in the labeling index in the luminal and glandular epithelia, the periluminal, periglandular and deep stromal regions and the myometrium were surveyed in normal adult mice during the estrous cycle and early pregnancy, in prepubertal mice and in ovariectomized adult and young animals treated with estrogen and/or progesterone. All results obtained were consistent with those obtained in previous histometric and autoradiographic studies and proved the effectiveness of the BrdU labeling method in the study of the uterus as well as many other organs. A marked rise in the labeling index was found in the luminal epithelium at metestrus, as well as on the proestrous morning, indicating the occurrence of extensive cell proliferation in the absence of estrogen stimulation. The change in the labeling index in adult mice was much more evident in the luminal epithelium than in the glandular epithelium in all conditions examined. On the other hand, the change in the stroma was more eminent in the periglandular region than in the periluminal and deep regions in most conditions. In immature mice, a great increase in labeling incidence occurred not only in luminal epithelium but also in muscle layers along with the process of puberty and at the time of estrogen stimulation. A moderate increase in the incidence also occurred in all other areas of the uterus including the perimetrium. Again, the increase was more prominent in the periglandular area than in other stromal regions.

endocrinologia japonica

DNA Replication in Uterine Cells of Adult and Prepubertal Mice Under Normal and Hormonally Stimulated Conditions Detected by Bromodeoxyuridine Labeling Method.