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Semin Reprod Med 2001; 19(1): 087-096
DOI: 10.1055/s-2001-13915
Copyright © 2001 by Thieme Medical Publishers, Inc., 333 Seventh Avenue, New York, NY 10001, USA. Tel.: +1(212) 584-4662

Functional Importance of Bovine Myometrial and Vascular LH Receptors and Cervical FSH Receptors

Mordechai Shemesh1 , Dario Mizrachi1 , Michael Gurevich1 , Yehuda Stram2 , Laurence S. Shore1 , Michael J. Fields3
  • 1Hormone Research, Kimron Veterinary Institute, Bet Dagan, Israel and
  • 2Virology, Kimron Veterinary Institute, Bet Dagan, Israel and
  • 3Animal Science Department, University of Florida, Gainesville, Florida
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Publication History

Publication Date:
31 December 2001 (online)

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ABSTRACT

Bovine myometrium and cervix contain luteinizing hormone/human chorionic gonadotropin (LH/hCG) binding sites, LH receptor (LH-R) messenger RNA (mRNA), and LH-R protein. Expression of LH-R is dependent on the stage of the cycle. LH-R expression is high during the luteal phase but weak during the follicular phase. In both myometrium and cervix, LH activates both the adenylate cyclase and phospholipase C pathways, and the effect of LH on both pathways at each stage of the cycle is correlated with the amount of LH-R present in the tissue. Because activation of cyclic AMP (cAMP) is associated with myometrial quiescence, we suggest that LH activation of uterine cAMP could serve to keep the uterus quiescent during the luteal phase. On the other hand, in the uterine vein LH-R mRNA and LH-R are maximal during preestrus/estrus as opposed to the luteal phase. In the uterine vein, LH increases the expression of cyclooxygenase and production of both prostaglandin E2 (PGE2) and PGF2α. Because PGF2α is the physiological luteolytic signal in the cow, we suggest that this increase in prostaglandin production by the uterine vein is part of the physiological events leading to luteolysis. In addition to uterine LH-R, the bovine cervix at preestrus/estrus has high levels of follicle-stimulating hormone receptor (FSH-R) and its corresponding mRNA. As with LH-R, activation of FSH-R by FSH is associated with activation of a G protein-coupled receptor family that mediates the cAMP and inositol phosphate signaling pathways. Activation of these signaling pathways is associated with an increase in the expression of cyclooxygenase and production of PGE2. Because expression of the FSH receptor was maximal at the time of the FSH peak in the blood, we suggest a physiological role for FSH in the cervix relaxation and opening at estrus.

KEYWORD

Myometrium - LH - LH receptors - bovine

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