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Biology of Reproduction, Vol 21, 269-272, Copyright © 1979 by Society for the Study of Reproduction

Effects of Estrogen on Mitosis in Individual Cell Types of the Immature Rat Uterus

JOHN L. KIRKLAND 1, LAURIE LaPOINTE 1, ERIC JUSTIN 1, , and GEORGE M. STANCEL 1

1 Division of Endocrinology, Department of Pediatrics, Baylor College of Medicine and Department of Pharmacology, The University of Texas Medical School at Houston, Houston, Texas 77025


This study was initiated to determine the time course of estrogen action in individual uterine cell types of the immature rat uterus. Animals were treated with a single injection of estradiol-17beta for various times and colchicine was administered 4 h prior to sacrifice. In the luminal epithelium, a peak of arrested mitoses was observed 24 h after hormone administration and represented sim12% of the cell population. In contrast both the stroma and myometrium displayed a peak of arrested mitoses 36-48 h after hormone administration and the maximum value represented sim1% of the total cell populations. These results indicate that the patterns of estrogen-induced cell division are quantitatively and qualitatively distinct in the different cell types of the immature rat uterus.

Note:
ACKNOWLEDGMENTS The authors wish to express their appreciation to Mrs. Barbara Harris and Mrs. Roljean Henderson for skillful assistance and advice.

Submitted on February 9, 1979
Accepted on April 16, 1979




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Copyright © 1979 by the Society for the Study of Reproduction.