title: Thromboxane receptor signalling in human myometrial cells.
abstract: We measured the effects of stable thromboxane A2 (TXA2) analogues on signalling in cultured human myometrial cells. U46619 and/or IBOP stimulated total inositol phosphates (IPs) and cAMP production, RhoA-associated protein kinase (ROK) activity and elevated intracellular calcium [Ca2+]i. Pretreatment of the cells with pertussis toxin did not inhibit IPs or [Ca2+]i production but the thromboxane receptor (TP) antagonist SQ-29548 did inhibit IPs and cAMP production, the elevation of [Ca2+]i, and the increase in ROK activity. Pretreatment with thapsigargin inhibited [Ca2+]i elevation. TP receptor-stimulated ROK activity was inhibited by the ROK inhibitor Y27632 while ROK activity was enhanced by the caspase 3 inhibitor, Z-DEVD-FMK. TP receptor-stimulated IPs production is additive to prostaglandin F2alpha (FP) or prostaglandin E (EP) receptor-stimulated IPs production and neither FP nor EP receptor-stimulated IPs production is inhibited by SQ29548. Thus cultured human myometrial cells express at least two functional TP receptor subtypes; TPalpha-like (cAMP-stimulating) and TPbeta-like (IPs, [Ca2+] and ROK-stimulating).
authors.affiliation: Nuffield Department of Obstetrics and Gynaecology, University of Oxford, John Radcliffe Hospital, Headington, UK. frances.moore@obs-gyn.ox.ac.uk
authors.forename: Frances
authors.initials: F
authors.lastname: Moore
authors.forename: Gergely
authors.initials: G
authors.lastname: Asbóth
authors.forename: Bernal Andrés
authors.initials: BA
authors.lastname: López
mesh_terms: D019796:15-Hydroxy-11 alpha,9 alpha-(epoxymethano)prosta-5,13-dienoic Acid / Q000494:pharmacology; D000577:Amides / Q000494:pharmacology; D000595:Amino Acid Sequence; D019086:Bridged Bicyclo Compounds, Heterocyclic; D002118:Calcium / Q000378:metabolism; D053148:Caspase 3; D061945:Caspase Inhibitors; D002478:Cells, Cultured; D000242:Cyclic AMP / Q000378:metabolism; D004791:Enzyme Inhibitors / Q000494:pharmacology; D005231:Fatty Acids, Unsaturated; D005260:Female; D006801:Humans; D006834:Hydrazines / Q000494:pharmacology; D047908:Intracellular Signaling Peptides and Proteins; D008969:Molecular Sequence Data; D009215:Myometrium / Q000166:cytology / Q000187:drug effects / Q000378:metabolism*; D009842:Oligopeptides / Q000494:pharmacology; D020033:Protein Isoforms; D017346:Protein Serine-Threonine Kinases / Q000037:antagonists & inhibitors / Q000378:metabolism; D011725:Pyridines / Q000494:pharmacology; D017482:Receptors, Thromboxane / Q000187:drug effects / Q000378:metabolism*; D015398:Signal Transduction; D010738:Type C Phospholipases / Q000187:drug effects / Q000378:metabolism; D054460:rho-Associated Kinases
chemical_list: D000577:Amides; D019086:Bridged Bicyclo Compounds, Heterocyclic; D061945:Caspase Inhibitors; D004791:Enzyme Inhibitors; D005231:Fatty Acids, Unsaturated; D006834:Hydrazines; D047908:Intracellular Signaling Peptides and Proteins; D009842:Oligopeptides; D020033:Protein Isoforms; D011725:Pyridines; D017482:Receptors, Thromboxane; C110772:benzoylcarbonyl-aspartyl-glutamyl-valyl-aspartyl-fluoromethyl ketone; C108830:Y 27632; D019796:15-Hydroxy-11 alpha,9 alpha-(epoxymethano)prosta-5,13-dienoic Acid; C045749:SQ 29548; D000242:Cyclic AMP; D017346:Protein Serine-Threonine Kinases; D054460:rho-Associated Kinases; D010738:Type C Phospholipases; C505407:CASP3 protein, human; D053148:Caspase 3; D002118:Calcium