特异性相互作用毛细管电色谱法筛选中药活性成分
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摘要
中药是中国千年传统文化的积淀,也是中华民族的瑰宝。但中药因其成分复杂,药效组分模糊而限制了其国际化、现代化的步伐。如何对目标药物进行筛选,找出药效明确的活性成分便成为中药现代化发展的关键。传统的药物筛选方法是以动物模型为基础,这种方法虽然能够得到较为可靠的目标活性物质,但是其周期很长,成本也非常高,还会受到环境的影响。受体学说的阐明,为药物筛选提供了新的思路,以受体为靶分子的药物筛选也就应运而生,这种方法可与多种分析手段结合,目的性更强,且能大大缩短筛选的周期,成为了当今药物筛选中较为重要的一种方法。
     本研究采用血小板作为靶分子建立开管毛细管电色谱法,对中药丹参和三七中抗/促血小板活性成分进行筛选。为进一步评价血小板和活性成分之间相互作用力的强度,本研究首次推导出了适用于所建立方法的结合常数计算公式,从而能够定量评价复杂体系中活性成分与血小板的相互作用。本文的研究内容如下:
     ①建立了一种新的开管毛细管电色谱方法,利用物理吸附的方式将血小板固定于毛细管内壁,通过改变固定长度,研究样品在其中的迁移行为变化,并根据迁移淌度与血小板涂层长度之间的线性方程,得到目标组分与血小板相互作用的结合常数。通过对血小板浓度,洗脱剂,运行缓冲液等影响因素的考察和优化,得到了本方法的适用条件。最后将所建立的方法应用到了HSA与帕珠沙星相互作用的评价中,所得结合常数与文献值较为相符,从而证明了本方法能够用于药物-受体的相互作用强度评价。
     ②将此方法应用于阳性药物阿司匹林、阴性药物帕珠沙星与血小板的相互作用中,通过荧光光谱法和亲和萃取法的验证,证明了本方法所建立的结合常数计算公式,能够对特异性相互作用进行评价。
     ③将此方法应用于核苷混合物中抗/促血小板成分的筛选中,首先通过各核苷在不同血小板涂层长度下的峰型变化,定性筛选出了抗/促血小板的成分,然后再将这些成分单独与血小板进行实验,得到了其与血小板的结合常数,从而定量地评价了这些成分与血小板之间的相互作用力。
     ④将此方法应用于实际中药丹参和三七提取物中抗/促血小板活性成分的筛选,并计算出了各峰所对应的成分与血小板之间的结合常数,通过比较结合常数值的大小,得到了这些峰所对应的成分与血小板相互作用的强度,为进一步筛选提供了数据参考。
     ⑤对九种野生菌/食用菌中核苷成分进行了定性定量分析,得到了各野生菌/食用菌中核苷的种类及含量,通过对各野生菌中核苷成分的分析,初步预测了具有潜在抗/促血小板功能的野生菌/食用菌,为其药理作用的进一步探索奠定了基础。
Traditional Chinese Medicine (TCM) is a great contribution of Chinese people to the human being. But the internationalizing and modernizing of TCM was restricted because of its complex matrix and undefined active components. Therefore, screening of active components in TCM is benificial for its modernization. Although animal models are commonly used screening method, it requires a long cycle, high cost and is easily influenced by the surroundings. With the development of the receptor theory, some new approaches for drug screeing have been developed using receptors as target molecules. These methods can combine with some analytical techniques with definite goals. And what’s more it can shorten the screening period. So it becomes an important and intensively used method in modern drug screening.
     In present study, platelet was used as receptor to establish an open tubular capillary electrochromatography (OT-CEC) method, and some TCM extracts including salvia and pseudo-ginseng were screened. Furthermore, a formula related to the binding constant was deduced, by which the interaction between receptor and ligand can be evaluated quantitatively. The main contents of present study were as follows:
     ①A new OT-CEC was established which was executed by physically attached of platelet onto the inner wall of the capillary. By varying the coating length of the platelet, the corresponding sample mobility can be obtained and the binding constant can be calculated by the deduced formula. By optimizing the platelet density, washing solution and running buffer, the working conditions was carefully selected. Finally this method was used to evaluate the interaction between HSA and pazufloxacin. The result is almost agreed with the records which proved the method can be used to evaluate the interaction between the target and receptor.
     ②The established method was used to evaluate the interaction between platelet and aspirin, pazufloxacin, respectively. The result was compared by fluorescence spectrum and affinity extraction which revealed that the established method can be applied to evaluate the specific interaction.
     ③Applied the established method to screen the anti/promote platelet compounds from the mixture of nucleosides. The compounds were picked out in preliminary screening depending on the change of peak shape. And then the binding constants for the selected compounds were calculated separately to evaluate the binding strength quantitatively.
     ④The developed method was applied for the screening of platelet active components in the TCM extracts, and the binding constants were calculated for each peak. The result provide useful information for the further screening studies.
     ⑤The contents of four nucleosides in nine mushroom samples were determined by CE. Combined with the screening result in④, the potential anti- or pro- platelet effects of the investigated mushrooms can be predicted, which may be beneficial for the further pharmacology research of those mushrooms.
引文
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