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Effects of RU 486 on electrical activity, on sexual steroid and prostaglandin F2 alpha concentrations in the myometrium at mid-pregnancy in the rat.

Authors
  • Bouftila, B
  • Clabaut, M
Type
Published Article
Journal
Comptes rendus de l'Académie des sciences. Série III, Sciences de la vie
Publication Date
Sep 01, 2001
Volume
324
Issue
9
Pages
805–813
Identifiers
PMID: 11558327
Source
Medline
License
Unknown

Abstract

Effects of RU 486 (10 mg.kg-1, per.os) were assessed at mid-pregnancy in the rat. One hour after RU 486 treatment, myometrial electrical activity stayed low. It increased from the 3rd hour after administration of RU 486 and a perfect synchronization of the bursts of the action potentials was observed from the 6th h to the 24th h. Tissular steroid hormones and PGF2 alpha, evaluated at hour 6 after RU 486 administration, showed a decrease of progesterone concentrations in both myometrium and uterus. Estradiol levels decreased in uterus whereas, PGF2 alpha levels increased in both myometrium and uterus. These results show for the first time that RU 486 strongly increases the myometrial electrical activity in the rat at mid-pregnancy. This action was closely related to E2, P4 and PGF2 alpha concentrations.

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