Cited by 18Preterm Birth and ChorioamnionitisInflammatory mediators and NSAID effectsReproductive Physiology in Livestock

Prostaglandin-Endoperoxide Synthase 1 Mediates the Timing of Parturition in Mice Despite Unhindered Uterine Contractility

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Herington, Jennifer L, O’Brien, Christine, Robuck, Michael F, Lei, Wei, Brown, Naoko, Slaughter, James C, Paria, Bibhash C, Mahadevan-Jansen, Anita +1 more·2018·Endocrinology

Abstract

Cyclooxygenase (COX)-derived prostaglandins stimulate uterine contractions and prepare the cervix for parturition.Prior reports suggest Cox-1 knockout (KO) mice exhibit delayed parturition due to impaired luteolysis, yet the mechanism for late-onset delivery remains unclear.Here, we examined key factors for normal onset of parturition to determine whether any could account for the delayed parturition phenotype.Pregnant Cox-1KO mice did not display altered timing of embryo implantation or postimplantation growth.Although messenger RNAs of contraction-associated proteins (CAPs) were differentially expressed between Cox-1KO and wild-type (WT) myometrium, there were no differences in CAP agonist-induced intracellular calcium release, spontaneous or oxytocin (OT)-induced ex vivo uterine contractility, or in vivo uterine contractile pressure.Delayed parturition in Cox-1KO mice persisted despite exogenous OT treatment.Progesterone (P 4 ) withdrawal, by ovariectomy or administration of the P 4 -antagonist RU486, diminished the delayed parturition phenotype of Cox-1KO mice.Because antepartum P 4 levels do not decline in Cox-1KO females, P 4 -treated WT mice were examined for the effect of this hormone on in vivo uterine contractility and ex vivo cervical dilation.P 4 -treated WT mice had delayed parturition but normal uterine contractility.Cervical distensibility was decreased in Cox-1KO mice on the day of expected delivery and reduced in WT mice with long-term P 4 treatment.Collectively, these findings show that delayed parturition in Cox-1KO mice is the result of impaired luteolysis and cervical dilation, despite the presence of strong uterine contractions.(Endocrinology 159: 490-505, 2018) P regnancy duration and the onset of birth (parturition) are tightly regulated events (1-3).One of the early factors known to influence the timing of labor is the timing of embryo implantation.Delayed or poor embryo implantation can result in mistiming of parturition, in part due to delayed or poor in utero embryonic development and maturation (4-6).Multiple-gestation pregnancies also contribute to the timing of parturition: Larger numbers of offspring prompt an earlier delivery, whereas few offspring in polytocous species are associated with prolonged gestation (7, 8).A larger-than-normal number of offspring triggers early-onset parturition due to premature stretch of uterine myometrial cells, activating the uterus to contract.The fetus and placenta also emit molecular signals that control the length of pregnancy and trigger the onset of labor (1, 9-11).

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  1. Lye S, Challis L. Paracrine and endocrine control of myometrial activity. In: Gluckman P, Johnson B, Nathanielsz P, eds. Advances in fetal physiology: Review in honour of G.C. Liggins. Vol 8. Ithaca, NY: Perinatology Press; 1989:361-375.

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Authors
Herington, J. L., O’Brien, C., Robuck, M. F., Lei, W., Brown, N., Slaughter, J. C., Paria, B. C., Mahadevan-Jansen, A., & Reese, J.
Affiliations
  • Vanderbilt University Medical Center (US)
  • Vanderbilt University (US)
  • Soochow University (CN)
Corresponding author
Herington, Jennifer L
Venue
Endocrinology
Published
2017-09-29
Volume
159
Issue
1
Pages
490-505
ISSN
  • 0013-7227 (ISSN-L)
  • 1945-7170
OpenAlex
W2759334075
Cited by
18
References
96
Citations by year
2025: 2 · 2024: 1 · 2023: 3 · 2022: 2 · 2021: 3 · 2020: 3 · 2019: 3 · 2018: 1
FWCI
1.50
Type
journal article
Language
en
Open access
Locations
  • Endocrinology (publishedVersion)
  • Europe PMC (PubMed Central) (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • Vanderbilt University
  • Vanderbilt University Medical Center
  • Georgia Clinical and Translational Science Alliance (KL2TR000446)
  • National Institutes of Health (KL2TR000446)
  • National Institute of General Medical Sciences (R01GM118361)
  • National Institute of Child Health and Human Development
  • National Center for Advancing Translational Sciences
  • Eunice Kennedy Shriver National Institute of Child Health and Human Development (HD081121, R21HD088830, R01HD081121, R21HD080148)
Topics
  • Health Sciences › Medicine › Epidemiology › Preterm Birth and Chorioamnionitis
  • Health Sciences › Medicine › Pharmacology › Inflammatory mediators and NSAID effects
  • Life Sciences › Agricultural and Biological Sciences › Agronomy and Crop Science › Reproductive Physiology in Livestock
Keywords
childbirth, cyclooxygenase-1, luteolysis, progesterone withdrawal, uterine contractility, cervical dilatation, oxytocin, labor onset, gestation length, embryo implantation, myometrium, RU486
MeSH terms
Abortifacient Agents, Steroidal, Animals, Cells, Cultured, Cervix Uteri, Luteolysis, Female, Membrane Proteins, Mice, Inbred Strains, Myometrium, Ovariectomy, Oxytocics, Oxytocin, Pregnancy, Pregnancy, Prolonged, Progesterone, Uterine Contraction, Mifepristone, Mice, Knockout, Cervical Ripening, Cyclooxygenase 1, In Vitro Techniques

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