Induction of preterm birth in mice by RU486

Dudley, D.J., Branch, D.W., Edwin, S.S. and Mitchell, M.D. (1996) Induction of preterm birth in mice by RU486. Biology of Reproduction, 55 5: 992-995. doi:10.1095/biolreprod55.5.992

Author Dudley, D.J.
Branch, D.W.
Edwin, S.S.
Mitchell, M.D.
Title Induction of preterm birth in mice by RU486
Journal name Biology of Reproduction   Check publisher's open access policy
ISSN 0006-3363
Publication date 1996-11
Sub-type Article (original research)
DOI 10.1095/biolreprod55.5.992
Volume 55
Issue 5
Start page 992
End page 995
Total pages 4
Place of publication Madison, WI, U.S.A.
Publisher Society for the Study of Reproduction
Language eng
Subject 1103 Clinical Sciences
1114 Paediatrics and Reproductive Medicine
1115 Pharmacology and Pharmaceutical Sciences
Formatted abstract
We hypothesized that treatment of pregnant mice with the progesterone receptor antagonist RU486 might cause preterm labor and result in the delivery of live pups. We also hypothesized that RU486 administration would alter prostaglandin production by decidual explants taken from these pregnancies. C3H/HeN females mated with C57BI/6 males were injected with a single s.c. dose of RU486 on Days 12-14 of gestation. Three doses were tested (50 μg, 150 μg, and 250 μg), and the mice were observed for evidence of delivery. The time course of delivery was determined in a second experiment using 150 μg of RU486, and care was taken to observe the condition of the delivered pups. In a third experiment, mice were killed when delivery commenced after injection with 150 μg of RU486, and decidual explants were prepared. Controls that had received injections of vehicle were killed at the same time, and decidual explants were established. Media were removed after 24 h and analyzed for prostaglandin E2 (PGE2) and prostaglandin F(2α) (PGF(2α)) by RIA and for interleukin 6 (IL-6) by ELISA. Two of 3 mice given 50 μg of RU486 delivered 16 pups prematurely. All 3 mice given 150 μg of RU486 delivered 22 pups prematurely, and 2 of 3 given 250 μg of RU486 delivered 12 pups prematurely. Of mice treated with 150 μg of RU486, none delivered within 12 h; 2 of 7 delivered within 15 h; and 6 of 7 delivered within 22 h. All pups appeared to be healthy, with no evidence of placental infarction or death. PGE2, PGF(2α), and IL-6 production by decidual explants was significantly greater in tissues taken from RU486-treated mice (n = 6) than in controls (n = 3). In summary, RU486 reliably induced preterm birth of the mice within 24 h after s.c. injection. This was associated with increased decidual prostaglandin and cytokine production and thus may mediate preterm labor. Inducing preterm birth with RU486 in a mouse model may be useful in investigations of the mechanism(s) of preterm labor.
Keyword Rhesus Macaques
Murine Decidua
Late Pregnancy
Fetal Death
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Unknown

Document type: Journal Article
Sub-type: Article (original research)
Collection: UQ Centre for Clinical Research Publications
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Citation counts: TR Web of Science Citation Count  Cited 55 times in Thomson Reuters Web of Science Article | Citations
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Created: Thu, 26 Aug 2010, 12:50:41 EST