期刊
LIFE SCIENCES
卷 116, 期 1, 页码 25-30出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.lfs.2014.08.018
关键词
Methyl palmitate; Pregnant human myometrium; Contractility; Perivascular fat; Voltage-gated potassium channels; 4-Aminopyridine; Tetraethylammonium; Oxytocin; Dysfunctional labor; Obesity
资金
- Galway University Hospital Perinatal Fund
Aims: Methyl palmitate is thought to cause relaxation in vascular smooth muscle by opening voltage-activated potassium channels. We have tested the hypothesis that methyl palmitate, a putative regulator from perivascular fat, is an inhibitor of the contractility of human pregnant myometrium and that its effects might partially explain the higher incidence of dysfunctional labor in obese women compared to those with normal body mass indices. Main methods: Strips of myometrium obtained with informed consent from women undergoing elective cesarean section at term were mounted in organ baths. Strips stimulated with oxytocin (1 nM) or KCl (30 mM) were exposed to cumulatively increasing concentrations of methyl palmitate up to 10 mu M. Similar strips were exposed to cumulative addition of the potassium channel blockers 4-aminopyridine and tetraethylammonium. The contractility of the strips was monitored and analyzed using conventional methods. Key findings: Methyl palmitate failed to inhibit oxytocin- or KCl-induced contractions over the concentration range tested. In fact, it exerted a slight excitatory effect in the presence of KCl, though not in the presence of oxytocin. The contractility of naive strips was unaltered by exposure to 1 mu M methyl palmitate. Both 4-aminopyridine and tetraethylammonium produced concentration-dependent contractions of human pregnant myometrium providing pharmacological evidence for the presence of voltage-activated potassium channels in this preparation. Significance: Our findings do not support the hypothesis that methyl palmitate is an inhibitor of human pregnant myometrial contractility. Alternate hypotheses must be pursued to explain the higher incidence of dysfunctional labor in obese women. (C) 2014 Elsevier Inc. All rights reserved.
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