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Hum. Reprod. Advance Access published online on December 8, 2005
Human Reproduction, doi:10.1093/humrep/dei400
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© The Author 2005. Published by Oxford University Press on behalf of the European Society of Human Reproduction and Embryology. All rights reserved. For Permissions, please email: journals.permissions@oxfordjournals.org
Received August 26, 2005
Revised October 18, 2005
Accepted October 28, 2005

Article

Functional characterization of prostaglandin transporter and terminal prostaglandin synthases during decidualization of human endometrial stromal cells

J. Kang 1, P. Chapdelaine 1, P.Y. Laberge 2, and M.A. Fortier 3 *

1 Unité de Recherche en Ontogénie et Reproduction, Centre de Recherche du CHUL, 2705 Boul. Laurier, Ste-Foy, Québec, G1V 4G2, Canada
2 Département d’Obstétrique et Gynécologie, Université Laval, Ste-Foy, Québec, G1K 7P4, Canada
3 Unité de Recherche en Ontogénie et Reproduction, Centre de Recherche du CHUL, 2705 Boul. Laurier, Ste-Foy, Québec, G1V 4G2, Canada; Département d’Obstétrique et Gynécologie, Université Laval, Ste-Foy, Québec, G1K 7P4, Canada

* To whom correspondence should be addressed.
M.A. Fortier, E-mail: mafortier{at}crchul.ulaval.ca


  Abstract

BACKGROUND: Decidualization of endometrial stromal cells is essential for successful implantation and pregnancy. Prostaglandins (PG) have been shown to be required for the initiation and maintenance of decidualization in animal models. The transport of PG across the plasma membrane is mediated by carriers such as prostaglandin transporter (PGT). Our recent data have shown the expression of human PGT (hPGT) in the endometrium during the menstrual cycle. The objective of the present study was to characterize hPGT in decidualized stromal cells. METHODS AND RESULTS: Human endometrial stromal cells were treated with a combination of cAMP and medroxyprogesterone acetate to induce decidualization. Decidualization was confirmed by morphological differentiation and increased secretion of prolactin. A large increase in hPGT mRNA level, as measured by real-time PCR analysis, was observed in decidual cells compared with control. Similarly, a 2-fold up-regulation of hPGT and 3-12-fold increase in PG biosynthetic enzymes were obtained at the protein level. Decidual cells exhibited a higher isotopic PGE2 uptake and greater intracellular PG levels than control. CONCLUSIONS: The higher uptake of PG by decidual cells is highly likely to be mediated via hPGT. PGT is a newly identified regulator of PG action at the cellular level and likely contributes to the regulation of PG action in female reproductive processes.

Keywords: decidualization/human endometrial stromal cells/prostaglandins/prostaglandin transporter.
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