Mol. Hum. Reprod. Advance Access originally published online on November 14, 2006
Molecular Human Reproduction 2007 13(1):69-75; doi:10.1093/molehr/gal093
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Expression and regulation of prostaglandin E synthase isoforms in human myometrium with labour
1Clinical Sciences Research Institute, Warwick Medical School, UHCW Trust, Coventry, UK, 2Department of Cell Biology & Anatomy and 3Department of Pharmacology and Therapeutics, Faculty of Medicine, University of Calgary, Alberta, Canada
4 To whom correspondence should be addressed at: Department of Pharmacology and Therapeutics, Heritage Medical Research Building Rm 280/286, Faculty of Medicine, University of Calgary, 3330 Hospital Drive NW, Calgary, Alberta, Canada T2N 4N1. E-mail: d.m.slater{at}warwick.ac.uk
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Abstract |
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Since the controversies regarding the use of non-steroidal anti-inflammatory drugs (NSAIDs) and selective cyclo-oxygenase (COX)-2 antagonists for the treatment of preterm labour (PTL), more emphasis has been placed on investigating the terminal synthases involved in the production of prostaglandins (PGs) to allow more targeted therapy in PTL. Prostaglandin E2 (PGE2) is synthesized by one of three enzymes, cytosolic prostaglandin E synthase (cPGES), microsomal PGES-1 (mPGES-1) and microsomal PGES-2 (mPGES-2). We have determined (i) the immuno-localization of all three PGES enzymes in lower segment pregnant human myometrium, (ii) the expression of PGES and COX-2 mRNA expression at term and preterm gestation with and without labour and (iii) the effect of interleukin (IL)-1ß on COX-2 and PGES mRNA and protein expression in human myometrial smooth muscle (HMSM) cell cultures. We show mPGES-1 protein located predominantly in myometrial and vascular smooth muscle cells (SMCs), whilst mPGES-2 protein is largely in stromal cells surrounding the SMC and cPGES is diffusely located throughout the myometrium. Expression of mPGES-2 mRNA increased with term labour and PTL and expression of COX-2 and mPGES-1 mRNA with term labour, whereas cPGES expression did not change. IL-1ß stimulated release of PGE2 by HMSM cells and increased COX-2 and mPGES-1 mRNA and protein expression. Thus, COX-2 expression and mPGES-1 expression are co-ordinately up-regulated in lower segment myometrium with term labour and with IL-1ß treatment in HMSM cells.
Key words: prostaglandin E2 synthase/myometrium/labour/myometrial smooth muscle
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