OBJECTIVE: This study was undertaken to test that uterine mast cell degranulation alters human myometrial contractility in vitro and to define what mediators are involved in this process. STUDY DESIGN: Longitudinal myometrial strips prepared from biopsy specimen obtained from the lower uterine segment of women at preterm and term gestation (with and without labor) were studied. Contractile responses to compound 48/80, a mast cell degranulator, were compared in the absence or presence of a mast cell stabilizer, H 1 and H 2 receptor antagonists, cyclooxygenase, and lipoxygenase inhibitors. RESULTS: Compound 48/80 increased myometrial contractility in all groups. The mast cell stabilizer cromolyn inhibited contractility, whereas the cyclooxygenase inhibitor ibuprofen, the H 1 -receptor antagonist S(+)-chlorpheniramine maleate, but not the H 2 antagonist cimetidine, only slightly attenuated this effect. The lipoxygenase inhibitor linoleyl hydroxamic acid augmented the responses to compound 48/80 in the preterm but not in the term group. CONCLUSION: Uterine mast cell degranulation, or the effects of their mediators, can modulate uterine contractility during pregnancy.
OBJECTIVE: This study was undertaken to test that uterine mast cell degranulation alters human myometrial contractility in vitro and to define what mediators are involved in this process. STUDY DESIGN: Longitudinal myometrial strips prepared from biopsy specimen obtained from the lower uterine segment of women at preterm and term gestation (with and without labor) were studied. Contractile responses to compound 48/80, a mast cell degranulator, were compared in the absence or presence of a mast cell stabilizer, H 1 and H 2 receptor antagonists, cyclooxygenase, and lipoxygenase inhibitors. RESULTS: Compound 48/80 increased myometrial contractility in all groups. The mast cell stabilizer cromolyn inhibited contractility, whereas the cyclooxygenase inhibitor ibuprofen, the H 1 -receptor antagonist S(+)-chlorpheniramine maleate, but not the H 2 antagonist cimetidine, only slightly attenuated this effect. The lipoxygenase inhibitor linoleyl hydroxamic acid augmented the responses to compound 48/80 in the preterm but not in the term group. CONCLUSION: Uterine mast cell degranulation, or the effects of their mediators, can modulate uterine contractility during pregnancy.
Authors: Pooja Mittal; Roberto Romero; Adi L Tarca; Sorin Draghici; Chia-Ling Nhan-Chang; Tinnakorn Chaiworapongsa; John Hotra; Ricardo Gomez; Juan Pedro Kusanovic; Deug-Chan Lee; Chong Jai Kim; Sonia S Hassan Journal: Am J Obstet Gynecol Date: 2011-02 Impact factor: 8.661
Authors: Pooja Mittal; Roberto Romero; Adi L Tarca; Juan Gonzalez; Sorin Draghici; Yi Xu; Zhong Dong; Chia-Ling Nhan-Chang; Tinnakorn Chaiworapongsa; Stephen Lye; Juan Pedro Kusanovic; Leonard Lipovich; Shali Mazaki-Tovi; Sonia S Hassan; Sam Mesiano; Chong Jai Kim Journal: J Perinat Med Date: 2010-07-14 Impact factor: 1.901
Authors: Jocelyn J Fitzgerald; Elena Ustinova; Kevin B Koronowski; William C de Groat; Michael A Pezzone Journal: Auton Neurosci Date: 2012-11-24 Impact factor: 3.145