Biol Reprod Keystone Symposia Conference on Frontiers in Reproductive Biology & Regulation of Fertility.
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Biology of Reproduction, Vol 24, 373-379, Copyright © 1981 by Society for the Study of Reproduction

Factors Influencing Circular Muscle Activity in the Pregnant Rat Uterus

TATSUHIKO KAWARABAYASHI 1, and JEAN M. MARSHALL 1

1 Section of Neurosciences, Division of Biology and Medicine, Brown University, Providence, Rhode Island 02912


Near the end of pregnancy the circular muscle of the rat uterus exhibits characteristic changes that are apparently prerequisite for normal delivery. This study concerns the effects on the circular muscle of some intrinsic factors believed to regulate the myometrium during pregnancy, namely, uterine volume (stretch), the ovarian steroids, and the fetoplacental unit. We compared the activity of circular muscle isolated from 1) gravid and nongravid uterine horns of unilaterally pregnant rats, 2) normal and dislocated horns of unilaterally placental-dislocated rats, 3) ovariectomized rats, and 4) normal pregnant rats. Microelectrode and tension recordings were made on the circular muscle segments obtained from these groups of animals at the end of gestation and during parturition. The results show that uterine volume and circulating estrogens are more important than the fetoplacental unit in the evolution of circular muscle activity in the pregnant rat.

Note:
ACKNOWLEDGMENTS We wish to thank Mrs. Suzanne Hahn for her excellent technical assistance.

Submitted on August 29, 1980
Accepted on November 14, 1980




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