摘要
槲皮素(quercetin,Que),是一种天然的黄酮类化合物,具有多种生物活性[1],但是Que水溶性差,口服时胃肠难以吸收[2].因此,为进一步开发和利用Que,人工合成水溶性Que——槲桷皮素硫酸酯(sodiumquercetinsulfate...
Quercetin is a kind of natural flavonoids.Various pharmacological activities of quercetin have been studied extensively.Sodium quercetin sulfate (SQS) has inhibitory effect on platelet aggregation induced by thrombin,but the mechanism of SQS on blood platelet still remains unclear. Effects of SQS on cytosolic calcium concentration ([Ca 2+ ] i) induced by thrombin and protein kinase C(PKC) in pig platelets has been studied.[Ca 2+ ] i was determined by Fura 2 AM fluorescence technique and PKC activity was assayed by incubating PKC with histone ⅢS and [γ 32 P] ATP.The results showed that SQS inhibited Ca 2+ influx in blood platelet induced by thrombin in the presence of extracellular Ca 2+ 1 mmol·L -1 ;SQS also had inhibitory effect on internal Ca 2+ release in the absence of extracellular Ca 2+ .SQS inhibited the activity of cytosolic PKC from blood platelet,but had no effect on membrane PKC.SQS inhibited platelet aggregation induced by thrombin and its molecular mechanism might be due to its inhibition of calcium pathway and PKC pathway.This work primarily provided evidence that helps to clarify the molecular mechanism of the antiplatelet actions of SQS.
出处
《中国生物化学与分子生物学报》
CAS
CSCD
1999年第2期334-336,共3页
Chinese Journal of Biochemistry and Molecular Biology
基金
广东省重点学科资助课题
关键词
槲皮素
硫酸酯
游离钙
蛋白激酶C
血小板
Sodium quercetin sulfate
Quercetin
Calcium
Protein kinase C
Blood platelet