Cited by 79Preterm Birth and ChorioamnionitisReproductive Health and ContraceptionReproductive System and Pregnancy

Effects of the antiprogesterone RU 486 on preterm birth in the rat

Garfield, R.E., Gasc, J.M., Baulieu, E.E.·1987·American Journal of Obstetrics and Gynecology

Abstract

The effects of the antiprogesterone compound RU 486 on preterm delivery, myometrial gap junctions, and plasma levels of steroid hormones were investigated in pregnant rats. Injection of RU 486 on day 16 of gestation resulted in prolonged delivery beginning after 24 hours. The preterm birth initiated by RU 486 was preceded and accompanied by the extensive development of gap junctions between myometrial cells. R 5020, but neither progesterone nor dexamethasone, prevented preterm birth and the development of gap junctions. Estrogen and progesterone levels declined after RU 486 treatment but only after a major proportion of the fetuses were delivered. This study indicates that progesterone may normally inhibit uterine contractility by suppressing the genome responsible for the expression of gap junctions.

Integrity signals

Registry

Crossref · 10.1016/s0002-9378(87)80315-0

Cites

18 of 18 references verified0 citation errors · 0 not checkable

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  • A decrease in local progesterone concentrations or receptor number is a plausible mechanism for labour initiation, because progesterone antagonists initiate preterm labour and progestational agents prevent it.

    “however, because progesterone antagonists—such as RU486—initiate preterm labour and progestational agents prevent preterm labour, a decrease in local progesterone concentrations or in the number of receptors is a plausible mechanism for initiation of labour.16, 17, 18”

    From Epidemiology and causes of preterm birth (2008) · cites this paper as [17]

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Authors
Garfield, R. E., Gasc, J. M., & Baulieu, E. E.
Affiliations
McMaster University (CA)
Venue
American Journal of Obstetrics and Gynecology
Publisher
Elsevier BV
Published
1987-11
Volume
157
Issue
5
Pages
1281-1285
ISSN
0002-9378 (ISSN-L)
OpenAlex
W2088704507
Cited by
79
References
20
Citations by year
2024: 1 · 2023: 1 · 2022: 1 · 2021: 2 · 2020: 1 · 2019: 2 · 2018: 4 · 2017: 1 · 2016: 1 · 2015: 2 · 2013: 3 · 2012: 3
FWCI
2.71
Type
journal article
Language
en
Open access
closed
Locations
  • American Journal of Obstetrics and Gynecology (publishedVersion)
  • PubMed (publishedVersion)
Topics
  • Health Sciences › Medicine › Epidemiology › Preterm Birth and Chorioamnionitis
  • Health Sciences › Medicine › Public Health, Environmental and Occupational Health › Reproductive Health and Contraception
  • Life Sciences › Immunology and Microbiology › Immunology › Reproductive System and Pregnancy
Keywords
RU486, mifepristone, antiprogesterone, preterm birth, myometrium, gap junctions, progesterone, estrogen, steroid hormones, uterine contractility, pregnancy, dexamethasone
MeSH terms
Animals, Estrenes, Female, Intercellular Junctions, Obstetric Labor, Premature, Myometrium, Pregnancy, Pregnancy Maintenance, Progesterone, Rats, Inbred Strains, Mifepristone, Rats

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