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


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.
Kang
J
J
Unité de Recherche en Ontogénie et Reproduction, Centre de Recherche du CHUL, 2705 Boul. Laurier, Ste-Foy, Québec, Canada.
Chapdelaine
P
P
Laberge
P Y
PY
Fortier
M A
MA
D015124:8-Bromo Cyclic Adenosine Monophosphate / Q000494:pharmacology; D018929:Cell Culture Techniques; D003656:Decidua / Q000166:cytology / Q000378:metabolism*; D004717:Endometrium / Q000166:cytology*; D005260:Female; D006801:Humans; D007700:Kinetics; D017258:Medroxyprogesterone Acetate / Q000494:pharmacology; D027361:Organic Anion Transporters / Q000235:genetics / Q000378:metabolism*; D011451:Prostaglandin-Endoperoxide Synthases / Q000378:metabolism*; D012333:RNA, Messenger / Q000235:genetics; D017154:Stromal Cells / Q000187:drug effects / Q000378:metabolism*
D027361:Organic Anion Transporters; D012333:RNA, Messenger; C503526:SLCO2A1 protein, human; D015124:8-Bromo Cyclic Adenosine Monophosphate; D017258:Medroxyprogesterone Acetate; D011451:Prostaglandin-Endoperoxide Synthases