Journal
REPRODUCTIVE SCIENCES
Volume 20, Issue 8, Pages 882-890Publisher
SAGE PUBLICATIONS INC
DOI: 10.1177/1933719112468949
Keywords
calcium-sensing receptors; calhex-231; calindol; cinacalcet; human myometrium; tocolysis
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Funding
- Alva Foundation
- Canadian Institutes of Health Research
- University Hospital Galway Perinatal Fund
- McMaster University
- National University of Ireland, Galway, Ireland
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Ligands for extracellular calcium-sensing (CaS) receptors inhibit oxytocin-induced contractions of the rat's uterus. In this study, we investigated whether the CaS receptor ligands calindol, cinacalcet, and calhex 231 have similar effects on pregnant human myometrium. We compared their effects to those of the calcium-channel blocker nifedipine. In conventional concentration-effect experiments, both the mean contractile force (MCF) and the maximum amplitude of contractions induced by 1 nmol/L oxytocin were inhibited by nifedipine. Calindol and cinacalcet were ineffective as inhibitors, while calhex-231 produced partial inhibition. When single 10 mol/L doses were applied calhex-231 produced a slowly developing inhibition, reducing the MCF to 38%, and amplitude to 34%, of vehicle controls after 1 hour. In similar experiments, calindol was ineffective while cinacalcet weakly inhibited only the amplitude. Immunohistochemistry revealed sparse expression of CaS receptors in pregnant human myometrium.
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