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- W2031504042 abstract "To investigate the effect of changes in CO2 tension on airway smooth muscle tone induced by various agonists, contractile responses to acetylcholine, histamine and endothelin-1 (ET-1) were studied in isolated guinea pig tracheae at very low PCO2 (16 +/- 0 mmHg, n = 38), moderately low PCO2 (28 +/- 0 mmHg, n = 23), normal PCO2 (38 +/- 1 mmHg, n = 70) or high PCO2 (94 +/- 1 mmHg, n = 32). The minimum concentration of ET-1 (10(-10) M) needed to induce contractions was lower than that of acetylcholine (10(-7) M) and histamine (10(-7) M) at normal PCO2. Changes in PCO2 did not significantly affect acetylcholine- or histamine-induced contractions. In contrast, very low and moderately low PCO2 attenuated the contractions induced by ET-1, but high PCO2 potentiated those induced by a high concentration of ET-1. Very low PCO2 with normal pH and with high pH attenuated the contractions caused by ET-1, whereas normal PCO2 with high pH did not. These results suggest that ET-1-induced airway smooth muscle contraction can be modified by PCO2 per se. Aspirin and indomethacin potentiated the responses to ET-1 at very low PCO2 more than at normal PCO2, but attenuated the responses to low concentration of ET-1 at high PCO2. These results also suggest that cyclooxygenase-related eicosanoids are involved in the effects of PCO2 on ET-1-induced contractions." @default.
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- W2031504042 date "1993-02-01" @default.
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- W2031504042 title "Modification by CO2 of endothelin-1-induced contraction of isolated guinea pig trachea" @default.
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- W2031504042 doi "https://doi.org/10.1007/bf03011316" @default.
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