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- W2014741603 abstract "The contractile activity of leukotriene B4 (LTB4), leukotriene D4 (LTD4) and histamine on strips of guinea pig lung parenchyma was shown to be dependent on the calcium concentrations of the Krebs solution. The calcium channel blocker verapamil (2.0 to 15uM) had an additive effect on the inhibitory activity of low calcium (0.1 mM) on contractions of guinea pig parenchyma to leukotrienes and histamine. Cobalt chloride, a divalent cation, also produced dose-dependent reductions of the myotropic activities of LTB4, LTD4 and histamine. An antagonist of calmodulin, triflouperazine (1–200 uM), dose-dependently inhibited the contractile activity of the three agonists on the parenchyma strip. The IC50 of this compound for inhibition of histamine was much lower (2–3uM) than the IC50 for inhibition of leukotrienes (75 uM). Valinomycin, a potassium ionophore, also interfere with the contractile activities of leukotrienes and histamine whereas a blocker of sodium channel, tetrodotoxin, had no effect on the activity of these agonists. Furthermore, an inhibitor of methyltransferase, 3-deazaadenosine, significantly diminished the responses of the parenchyma to leukotrienes and histamine. These results confirmed the important role of extracellular and intracellular calcium in the myotropic activity of leukotrienes and histamine in guinea pig lungs and showed that compunds which interfere either directly or indirectly with calcium mobilization into the lung smooth muscles, decreased the tissue responsiveness." @default.
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- W2014741603 date "1986-06-01" @default.
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- W2014741603 title "Further studies on the mechanism of action of leukotrienes and histamine on guinea pig lung parenchyma role of calcium, phospholipase and methyltransferase" @default.
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- W2014741603 doi "https://doi.org/10.1016/0090-6980(86)90214-5" @default.
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