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作 者:王泽君[1] 邓艳春[1] 于德洁[1] 鲍光宏[1]
机构地区:[1]中国医学科学院基础医学研究所中国协和医科大学基础医学院,北京100005
出 处:《生物物理学报》1999年第4期655-660,共6页Acta Biophysica Sinica
基 金:国家自然科学基金!(39570274)
摘 要:用Fura - 2/AM 荧光测量技术研究了5 - 羟色胺(5- HT) 诱导的大鼠尾动脉平滑肌细胞胞内钙升高和一氧化氮(NO) 的抑制效应。实验表明, 胞外0m mol/ L Ca2 + 时胞内静息[Ca2 + ] i 为20 .2±8 .6nmol/L(n = 8) 。10μmol/L 5- HT 可诱导出胞内钙库释放引起的瞬态[Ca2 +]i 升高,其峰值达245 .7 ±71.6nmol/ L(n = 6) 。10 - 7 mol/L 硝普钠(SNP) 可抑制5- HT 诱导的[Ca2 +]i 升高,其峰值浓度降为75.1±35 .9nmol/L(n = 5) 。当细胞浴液含2.5m mol/L Ca2 + 时,静息[Ca2 +]i为112 .8 ±10 .3nmol/ L(n = 5) , 这时10μmol/ L 5 - HT 可诱导[Ca2 + ] i 的峰值为252 .3 ±80 .6nmol/L(n = 4) ,以及其后平台浓度为143 .0 ±37 .6nmol/L(n = 4) ,略大于[Ca2 +]i 为112.8 ±10 .3nmol/L 的静息浓度,为外钙内流引起。10 - 7 mol/L SNP 也可抑制5- HT 诱导[Ca2 + ]i 平台相浓度。平台浓度由143The aim of our study was to determine the alterations in intracellular free calcium concentration (i) of rat tail artery smooth muscle cells by using Fura-2/AM fluorescence measurement method. Experimental results indicated that there was a fast rise i from a resting level 20.2±8.6nmol/L (n=8) to 245.7±71.6nmol/L(n=6) peak value. This peak value was 10μmol/L 5-HT induced from calcium store, and this i peak value can be reduced to 75.1±35.9μmol/L(n=5) by 10-7mol/L SNP. When extracellular solution composed 2.5mmol/L Ca2+, the resting i was 112.8±10.3nmol/L(n=5). In this condition, a i peak value of 253.3±80.6nmol/L and followed a plateau of 143.37±6nmol/L(n=4) were evoked by 10μmol/L 5-HT. This i plateau value is a little bigger than that of 112.8±10.3nmol/L resting i that was generated by Ca2+ influx. The 143±476nmol/L(n=3) of i plateau value was reduced to 86.1±14.9nmol/L by 10-7mol/L SNP. This results suggested that NO can inhibit calcium store release as well as extracellular Ca2+ influx induced by 5-HT.
分 类 号:Q463[生物学—生理学] R331.3[医药卫生—人体生理学]
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