Searchable abstracts of presentations at key conferences in endocrinology
Endocrine Abstracts (2008) 15 P290

SFEBES2008 Poster Presentations Reproduction (22 abstracts)

A profile of the prostanoids produced by human pregnant uterine tissue in vitro

Joanne Durn 1 , Kay Marshall 1 , Anna Nicolaou 1 , Diane Farrar 2 , Peter O’Donovan 2 & David Woodward 3

1University of Bradford, Bradford, UK; 2Bradford Royal Infirmary, Bradford, UK; 3Allergan Inc., Irvine, California, USA.

The aim of this study was to simultaneously profile, using electrospraionization liquid chromatography mass spectrometry (ESI-LC-MS), prostanoids (PG) produced in the pregnant labouring (L) and non labouring (NL) myometrium.

Lower segment samples were obtained at Caesarean section from consenting pregnant women (18–36 years of age) at term gestation (38–41weeks). Samples were transported to the laboratory and immediately bathed in physiological Kreb’s solution±indometacin (1 μM) for 1 h at 4  °C (samples with indometacin referred to as treated), prior to freezing and subsequent solid phase extraction. Extracts analysed using ESI-LC-MS were quantified using calibration lines made up of commercially available standards. Results are expressed as mean pg/mg protein (as estimated by Lowry method).

About 14 and 18 PG were identified and quantified in treated (T) NL and L samples, respectively. Untreated (U) samples (both L and NL) contained 18 prostanoids. L myometrium synthesised six series-1 PG, nine series-2 PG and three series-3 PG. NL samples gave roughly the same profile, producing 6,10 and 2 series-1,2 and 3 PG correspondingly.

Non labourLabour
6-keto-prostaglandin F (6-keto-PGF) predominates over every other PG identified in NL tissue (P<0.01)Prostaglandin F (PGF) predominates over every other PG identified (P<0.05), including 6-keto-PGF in T samples of L tissue
No significant difference between 6-keto-PGF from NL and L tissueSynthesis of 6-keto-PGF (U samples) is greater than any other P (P<0.05), including PGF (not significant)
PGF is the only PG to increase at labour versus non labour (P<0.05)

Our data are consistent with the role of prostacyclin as a mediator of uterine quiescence at term and the role of PGF as an elicitor of myometrial contractions at term labour.

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