title: Specificity of anti-leukotriene actions of nicardipine.
abstract: The calcium channel blocker, nicardipine (100 ng/ml) markedly antagonized the coronary vasoconstrictor effect of the peptide leukotrienes LTC4 and LTD4 on the isolated perfused cat coronary artery. However, nicardipine even at 300 ng/ml failed to antagonize the leukotriene induced contraction of either tracheal or pulmonary parenchymal strips from guinea pigs. However, at higher concentrations (i.e., 10 micrograms/ml), nicardipine inhibited the production of peptide leukotrienes from minced cat lung incubated in the presence of A23187. Thus, nicardipine exerts some selectivity in its anti-leukotriene actions.
mesh_terms: D000818:Animals; D002415:Cats; D003331:Coronary Vessels / Q000187:drug effects; D006168:Guinea Pigs; D066298:In Vitro Techniques; D008168:Lung / Q000378:metabolism; D008297:Male; D009119:Muscle Contraction / Q000187:drug effects; D009130:Muscle, Smooth / Q000187:drug effects*; D009131:Muscle, Smooth, Vascular / Q000187:drug effects; D009529:Nicardipine; D009543:Nifedipine / Q000031:analogs & derivatives* / Q000494:pharmacology; D013189:SRS-A / Q000037:antagonists & inhibitors* / Q000096:biosynthesis; D014132:Trachea / Q000187:drug effects; D014661:Vasoconstriction / Q000187:drug effects
chemical_list: D013189:SRS-A; D009529:Nicardipine; D009543:Nifedipine