Physiological mechanisms of pregnancy recognition in ruminants.

F. W. Bazer, W. W. Thatcher, P. J. Hansen, M. A. Mirando, Troy Ott, C. Plante

Research output: Contribution to journalReview article

108 Citations (Scopus)

Abstract

Maternal recognition of pregnancy in sheep, cattle and goats involves physiological mechanisms that result in protection of corpora lutea from luteolysis by modification or inhibition of uterine production of luteolytic pulses of prostaglandin (PG) F-2 alpha. Ovine, bovine and caprine luteal cells release oxytocin in a pulsatile manner during late dioestrus. Oxytocin then binds to its endometrial receptors and initiates luteolytic pulses of PGF-2 alpha. Ovine, bovine and caprine trophoblast protein-1 (oTP-1, bTP-1 and cTP-1) are secreted by the trophectoderm of conceptuses between Days 10 and 21-24 of pregnancy. These antiluteolytic proteins (oTP-1 and bTP-1) are primarily responsible for inhibiting uterine production of luteolytic amounts of PGF-2 alpha. During early pregnancy, the numbers of endometrial receptors for oxytocin are significantly lower in ewes and cows, and stimulatory effects of exogenous oxytocin on uterine production of PGF-2 alpha are correspondingly reduced or absent for ewes, cows and goats. Exogenous oestrogens can, through a uterine-dependent mechanism, stimulate synthesis of endometrial receptors for oxytocin and uterine production of PGF-2 alpha; an effect which is significantly attenuated during early pregnancy. These results suggest that oTP-1, bTP-1 and possibly cTP-1 exert their antiluteolytic effect(s) by: (1) inhibiting effects of oestrogen and/or progesterone necessary for synthesis of endometrial receptors for oxytocin; (2) inhibiting endometrial synthesis and/or recycling of oxytocin receptors directly; or (3) inducing the endometrium to synthesize an inhibitor of an enzyme(s) necessary for synthesis of PGF-2 alpha.

Original languageEnglish (US)
Pages (from-to)39-47
Number of pages9
JournalJournal of reproduction and fertility. Supplement
Volume43
StatePublished - Jan 1 1991

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Ruminants
Prostaglandins F
Oxytocin Receptors
Pregnancy
Oxytocin
Sheep
Goats
Estrogens
Luteolysis
Luteal Cells
Diestrus
Corpus Luteum
Recycling
Enzyme Inhibitors
Endometrium
Progesterone
Mothers
Proteins

All Science Journal Classification (ASJC) codes

  • Medicine(all)

Cite this

Bazer, F. W., Thatcher, W. W., Hansen, P. J., Mirando, M. A., Ott, T., & Plante, C. (1991). Physiological mechanisms of pregnancy recognition in ruminants. Journal of reproduction and fertility. Supplement, 43, 39-47.
Bazer, F. W. ; Thatcher, W. W. ; Hansen, P. J. ; Mirando, M. A. ; Ott, Troy ; Plante, C. / Physiological mechanisms of pregnancy recognition in ruminants. In: Journal of reproduction and fertility. Supplement. 1991 ; Vol. 43. pp. 39-47.
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Bazer, FW, Thatcher, WW, Hansen, PJ, Mirando, MA, Ott, T & Plante, C 1991, 'Physiological mechanisms of pregnancy recognition in ruminants.', Journal of reproduction and fertility. Supplement, vol. 43, pp. 39-47.

Physiological mechanisms of pregnancy recognition in ruminants. / Bazer, F. W.; Thatcher, W. W.; Hansen, P. J.; Mirando, M. A.; Ott, Troy; Plante, C.

In: Journal of reproduction and fertility. Supplement, Vol. 43, 01.01.1991, p. 39-47.

Research output: Contribution to journalReview article

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AB - Maternal recognition of pregnancy in sheep, cattle and goats involves physiological mechanisms that result in protection of corpora lutea from luteolysis by modification or inhibition of uterine production of luteolytic pulses of prostaglandin (PG) F-2 alpha. Ovine, bovine and caprine luteal cells release oxytocin in a pulsatile manner during late dioestrus. Oxytocin then binds to its endometrial receptors and initiates luteolytic pulses of PGF-2 alpha. Ovine, bovine and caprine trophoblast protein-1 (oTP-1, bTP-1 and cTP-1) are secreted by the trophectoderm of conceptuses between Days 10 and 21-24 of pregnancy. These antiluteolytic proteins (oTP-1 and bTP-1) are primarily responsible for inhibiting uterine production of luteolytic amounts of PGF-2 alpha. During early pregnancy, the numbers of endometrial receptors for oxytocin are significantly lower in ewes and cows, and stimulatory effects of exogenous oxytocin on uterine production of PGF-2 alpha are correspondingly reduced or absent for ewes, cows and goats. Exogenous oestrogens can, through a uterine-dependent mechanism, stimulate synthesis of endometrial receptors for oxytocin and uterine production of PGF-2 alpha; an effect which is significantly attenuated during early pregnancy. These results suggest that oTP-1, bTP-1 and possibly cTP-1 exert their antiluteolytic effect(s) by: (1) inhibiting effects of oestrogen and/or progesterone necessary for synthesis of endometrial receptors for oxytocin; (2) inhibiting endometrial synthesis and/or recycling of oxytocin receptors directly; or (3) inducing the endometrium to synthesize an inhibitor of an enzyme(s) necessary for synthesis of PGF-2 alpha.

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