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• W2085683781 abstract "The influence of ageing and endothelium removal on the sensitivity and contractile response of rat coronary arteries to intracellular Ca2+ ([Ca2+]i) during activation with serotonin (5-HT) and membrane depolarisation with 125 mM K+ was investigated. The sensitivity and contractile response of coronary arteries to 5-HT were significantly higher in 2-year-old than in 3-month-old rats. The receptor responsible for the 5-HT-induced contractions in coronary arteries belongs to a population of 5-HT2 receptors in both young and old rats based on the Schild plot. The resting levels of [Ca2+]i and active tension were both increased by age and endothelium removal. During depolarisation with 125 mM K+, the sensitivity to [Ca2+]i and maximal tension induced by [Ca2+]i were not affected by age or endothelium. During activation with 10 microM 5-HT, the maximal tension induced by [Ca2+]i was increased by age but not affected by endothelium, whereas the sensitivity to [Ca2+]i was increased by endothelium removal. In conclusion, ageing is associated with an increased sensitivity to 5-HT in rat coronary small arteries. The increased sensitivity to 5-HT seems to involve an augmented contractile response to [Ca 2+]i in 5-HT-activated coronary arteries and a diminished endothelial basal vasodilator function." @default.
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• W2085683781 date "2004-03-01" @default.
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• W2085683781 title "Age- and endothelium-dependent changes in coronary artery reactivity to serotonin and calcium" @default.
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• W2085683781 doi "https://doi.org/10.1016/j.vph.2003.12.001" @default.
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