title: Comparison of effects of formoterol and BRL 37344 on isolated term-pregnant rat myometrial strips in vitro.
abstract: This study was designed to compare the effects of beta-adrenoceptor agonists formoterol and BRL 37344 on spontaneous contractions and the levels of cAMP and cGMP of myometrial strips isolated from timed-pregnant rats. Myometrial strips were obtained from term-pregnant Wistar albino rats (n=12), mounted in organ baths and tested for changes in isometric tension in response to formoterol and BRL 37344. We evaluated the effect of increasing concentrations of formoterol and BRL 37344 on oxytocin-induced myometrial contractions and on contractions of myometrial smooth muscle pretreated with metoprolol, ICI 118.551 and SR 59230A (beta1, beta2, beta3-adrenoceptor antagonist, respectively, 10(-6) M). Effects of formoterol and BRL 37344 on cAMP and cGMP levels in isolated myometrial strips (n=6) were evaluated by radioimmunoassay kits. Formoterol (10(-12)-10(-8) M) and BRL 37344 (10(-11)-10(-5) M) concentration-dependently decreased the amplitude of oxytocin-induced contractions. E(max) value (100%) of formoterol was increased significantly more than E(max) value (70.6%) of BRL 37344 (P<0.05), with no change in pD(2) value (9.54+/-0.12 and 9.12+/-0.12, respectively). The inhibition of the amplitude of oxytocin-induced contractions by formoterol was antagonized with ICI 118.551 (10(-6) M), but they were not changed by metoprolol (10(-6) M) or SR 59230A (10(-6) M). The inhibition of the amplitude of oxytocin-induced contractions by BRL 37344 were antagonized with SR 59230A (10(-6) M), but they were not changed by metoprolol (10(-6) M) or ICI 118.551 (10(-6) M). Formoterol and BRL 37344 increased cAMP levels. BRL 37344 increased cGMP levels in BRL 37344 group more than control group, but this increase is less significant than cAMP levels (P>0.05). Formoterol and BRL 37344 decreased amplitude of myometrial contractions with similar potency, but efficacy of formoterol was better than BRL 37344.
authors.affiliation: Department of Obstetrics and Gynecology, Cumhuriyet University School of Medicine, 58140 Sivas, Turkey.
authors.forename: Nazan
authors.initials: N
authors.lastname: Yurtcu
authors.forename: Ali
authors.initials: A
authors.lastname: Cetin
authors.forename: Baris
authors.initials: B
authors.lastname: Karadas
authors.forename: Ayse
authors.initials: A
authors.lastname: Gonca Imir
authors.forename: Tijen
authors.initials: T
authors.lastname: Kaya
authors.forename: Taner
authors.initials: T
authors.lastname: Erselcan
authors.forename: Ihsan
authors.initials: I
authors.lastname: Bagcivan
authors.forename: Meral
authors.initials: M
authors.lastname: Cetin
mesh_terms: D058666:Adrenergic beta-2 Receptor Agonists; D058667:Adrenergic beta-3 Receptor Agonists; D000318:Adrenergic beta-Agonists / Q000494:pharmacology*; D000319:Adrenergic beta-Antagonists / Q000494:pharmacology; D000818:Animals; D000242:Cyclic AMP / Q000378:metabolism; D006152:Cyclic GMP / Q000378:metabolism; D004983:Ethanolamines / Q000494:pharmacology*; D005260:Female; D000068759:Formoterol Fumarate; D066298:In Vitro Techniques; D009215:Myometrium / Q000187:drug effects* / Q000378:metabolism / Q000502:physiology; D010121:Oxytocin; D011247:Pregnancy; D011412:Propanolamines / Q000494:pharmacology; D051381:Rats; D017208:Rats, Wistar; D014590:Uterine Contraction / Q000187:drug effects*
chemical_list: D058666:Adrenergic beta-2 Receptor Agonists; D058667:Adrenergic beta-3 Receptor Agonists; D000318:Adrenergic beta-Agonists; D000319:Adrenergic beta-Antagonists; D004983:Ethanolamines; D011412:Propanolamines; C026777:ICI 118551; D010121:Oxytocin; C057368:BRL 37344; D000242:Cyclic AMP; D006152:Cyclic GMP; D000068759:Formoterol Fumarate