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• W1979528917 abstract "1. In order to examine the mechanisms of cGMP-induced relaxation in airway smooth muscle, the effects of atrial natriuretic peptide (ANP) and 8-brom cGMP on muscle tone were studied by measuring isometric tension, while the effects on cytosolic Ca2+ concentrations were studied by measuring the spectra of fura-2 loaded in guinea-pig tracheal strips. 2. Atrial natriuretic peptide and 8-brom cGMP caused a concentration-dependent inhibition of spontaneous tone in the guinea-pig trachea. The relaxant effects of these agents on spontaneous tone were markedly suppressed in the presence of iberiotoxin (IbTX), a selective inhibitor of large-conductance Ca2(+)-activated K+ (BKCa) channels. Iberiotoxin (30 nmol/L) markedly affected the maximal effect induced by ANP and 8-brom cGMP and augmented EC70 values for ANP and EC50 values for 8-brom cGMP approximately 27- and 17-fold, respectively. The inhibitory effects of IbTX on relaxation induced by these agents were diminished in the presence of 1 mumol/L nifedipine, an antagonist of voltage-operated Ca2+ channels (VOCC). 3. The inhibitory action of ANP and 8-brom cGMP on spontaneous tone was not affected by the presence of 10 mumol/L glibenclamide, an inhibitor of ATP-sensitive K+ channels, and 100 nmol/L apamin, an inhibitor of small-conductance Ca2(+)-activated K+ channels. When these agents were applied to tissues precontracted by high (40 mmol/L) K+, the relaxant effects of these agents markedly diminished. 4. The extracellular Ca2(+)-dependent contraction was inhibited in the presence of 0.3 mumol/L ANP or 0.1 mmol/L 8-brom cGMP. Concentration-response curves to extracellular Ca2+ (0.03-2.4 mmol/L) were markedly diminished by exposure to these agents. The maximal effect induced by extracellular Ca2+ was affected by these agents. 5. Atrial natriuretic peptide caused an inhibition of spontaneous tone accompanied by a reduction in the intracellular Ca2+ concentration. In the presence of IbTX, the elimination of both muscle tone and cytosolic Ca2+ by ANP was suppressed. 6. We conclude that ANP and 8-brom cGMP activate BKCa channels and that the inhibition of Ca2+ influx through VOCC, mediated by BKCa channel activation, may be involved in cGMP-dependent bronchodilation." @default.
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• W1979528917 date "1997-02-01" @default.
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• W1979528917 title "EFFECTS OF BK_CaCHANNELS ON THE REDUCTION OF CYTOSOLIC Ca₂₊IN cGMP-INDUCED RELAXATION OF GUINEAPIG TRACHEA" @default.
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• W1979528917 doi "https://doi.org/10.1111/j.1440-1681.1997.tb01804.x" @default.
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