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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

A single post-ovulatory dose of ulipristal acetate impairs post-fertilization events in mice

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Gomez-Elias, Matias D. [1] ; May, Maria [2] ; Munuce, Maria Jose [3] ; Bahamondes, Luis [4] ; Cuasnicu, Patricia S. [1] ; Cohen, Debora J. [1]
Total Authors: 6
[1] Consejo Nacl Invest Cient & Tecn, Inst Biol & Med Expt IBYME, Vuelta Obligado 2490, C1428ADN, Buenos Aires, DF - Argentina
[2] Univ Buenos Aires, Fac Farm & Bioquim, Inst Invest Farmacol ININFA UBA CONICET, Buenos Aires, DF - Argentina
[3] Natl Univ Rosario, Sch Biochem & Pharmaceut Sci, Lab Reprod Med, Biochem Chem Area, Rosario, Santa Fe - Argentina
[4] Univ Estadual Campinas, Sch Med, Dept Obstet & Gynaecol, UNICAMP, Campinas, SP - Brazil
Total Affiliations: 4
Document type: Journal article
Source: MOLECULAR HUMAN REPRODUCTION; v. 25, n. 5, p. 257-264, MAY 2019.
Web of Science Citations: 0

Ulipristal acetate (UPA) is a selective progesterone receptor modulator used for emergency contraception that has proven to be highly effective in preventing pregnancy when taken up to 120 h after unprotected sexual intercourse. Even though it may act mainly by delaying or inhibiting ovulation, additional effects of UPA on post-fertilization events cannot be excluded. Therefore, the aim of this study was to determine whether a single post-ovulatory dose of UPA could prevent pregnancy using the mouse as a pre-clinical model. Mated females received a single dose of UPA (40 mg/kg) on Day E1.5 or E2.5 (E0.5: copulatory plug detection) and post-fertilization events were evaluated. Our studies revealed that UPA administration produced a significant decrease in the number of conceptuses compared to control. Moreover, UPA-treated females exhibited a lower number of early implantation sites on Day E5.5, despite normal in vivo embryo development and transport to the uterus at E3.5. Administration of UPA produced histological and functional alterations in the uterine horns, i.e., a dyssynchronous growth between endometrial glands and stroma, with non-physiological combination of both fractions compared to controls, and a completely impaired ability to respond to an artificial decidualization stimulus. Altogether, our results show that the administration of a single post-ovulatory dose of UPA impairs mouse pregnancy probably due to an effect on embryo-uterine interaction, supporting additional effects of the drug on post-fertilization events. Although these studies cannot be performed with human samples, our results with the mouse model provide new insights into the mechanism of action of UPA as an emergency contraception method. (AU)

FAPESP's process: 15/20504-9 - Clinical findings among progestin-only contraceptives' users
Grantee:Luis Guillermo Bahamondes
Support type: Research Projects - Thematic Grants