6533b854fe1ef96bd12aeaf1

RESEARCH PRODUCT

Inhibition of calcium entry induced by cularines and isocrasifoline in uterine smooth muscle.

Luis CastedoPilar D'oconCarmen VulaverdeDolores IvorraRafael BlascoSusana LópezDiego CortesLuz Candenas

subject

medicine.medical_specialtyNifedipineIn Vitro TechniquesOxytocinchemistry.chemical_compoundUterine ContractionAlkaloidsNifedipineCoumarinsInternal medicinePapaverinemedicineAnimalsVanadateBenzylisoquinolinePharmacologyPapaverineChemistryAlkaloidMuscle SmoothRats Inbred StrainsIsoquinolinesRatsEndocrinologyOxytocinMechanism of actionCalciumFemalemedicine.symptomVanadatesmedicine.drugMuscle contractionMuscle Contraction

description

Abstract The effects of nifedipine, papaverine and four benzylisoquinoline alkaloids (cularine, cularidine, celtisine and isocrasifoline) were studied in isolated rat uterus in order to clarify the mechanism of their relaxant action. All the compounds tested completely relaxed KCl-induced contractions and totally or partially inhibited oxytocin-induced rhythmic contractions. Only papaverine acted intracellularly, promoting relaxation of contractile responses induced by oxytocin or vanadate in a Ca 2+ -free medium. In spite of the structural relationship between papaverine and the other alkaloids, the mechanism of their relaxant action is not the same. The activities of cularine derivatives and of isocrasifoline were similar to that of nifedipine.

10.1016/0014-2999(91)90426-qhttps://pubmed.ncbi.nlm.nih.gov/1874285