花椒油素对A23187和钙调节血小板及细胞内游离钙作用的研究

Effect of xanthoxylin on A23187-and calcium-induced platelet aggregation and cytosolic free-Ca^(2+) level

目的 研究花椒油素对CaCl2和钙离子载体A23187调节血小板及其中Ca2+浓度的作用。方法 比浊法测定血小板聚集，用Fura-2/AM荧光法测定细胞内游离钙的水平。结果 花椒油素显著地抑制CaCl2和A23187诱导的血小板聚集，前者的抑制率为9.0%(67.1%，后者的抑制率为18.1%(72.5%。明显降低A23187诱导的血小板胞质游离Ca2+浓度，降低率为12.8%(63.4%。结论 花椒油素抑制聚集作用与降低细胞内游离Ca2+水平之间呈线性正相关（P<0.01）。

Objective To study the effects of xanthoxylin on platelet aggregation and freeCa2+ level induced by CaCl2 and A23187. Methods Platelet aggregation and free Ca2+ level in the platelet cytosol were measured by turbidimetry and fluorimetry of Fura-2/AM. Results Xanthoxylin at the concentration of 0.037, 0.185, 0.924, 9.240, 92.40 μmol/L significantly inhibited CaCl2 and A23187-induced platelet aggregation, with the inhibition rates ranging from 9.0% to 67.1% for CaCl2 and from 18.1% to 72.5% for A23187. A23187-induced free-Ca2+ level in the platelet cytosol was also significantly reduced (from 12.8% to 63.4%). Conclusion The inhibition rate of platelet aggregation was positively correlated with the reduction rate of cytosolic free-Ca2+ level by xanthoxylin.