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编号:13105624
合欢皮总皂苷抗肿瘤作用靶点鉴定与分子机制解析(1)
http://www.100md.com 2017年10月1日 《中国中药杂志》 2017年第19期
     [摘要] 合欢皮作为常用中药,临床常用于治疗失眠、焦虑、肿瘤等。现代药理中针对合欢皮总皂苷(TSAJ)抗肿瘤活性多有报道,但由于单体成分分离困难,药理机制难以开展。该研究采用MTT法和Hoechst 33258染色法,确认了TSAJ对肝癌细胞的生长抑制作用,构建了表面修饰有TSAJ的固相亲合微球,利用该固相微球特异性地从人肝癌细胞裂解液中富集靶点蛋白,再利用高分辨质谱对富集到的靶点蛋白进行鉴定。采用MataboAnalyst 3.0处理数据,筛选并确定了Exportin-2,Beta-actin-like protein 2,Myosin-9,Protein transport protein Sec61 subunit beta,Cytochrome c oxidase copper chaperone等5个靶点蛋白。这些蛋白分别具有调控细胞凋亡及细胞生长、分化、运动等功能,提示TSAJ的抗肿瘤机制可能与诱导细胞凋亡及抑制肿瘤血管生成有关。综上所述,该研究利用TSAJ修饰的固相亲和微球,特异性富集并鉴定了TSAJ的靶点蛋白,从靶点源头上解释了TSAJ抗肿瘤作用机制,同时也为中药复杂体系的分子药理机制研究提供了一种全新的思路。
, 百拇医药
    [关键词] 合欢总皂苷; 抗肿瘤; 靶点鉴定; 信号通路; 作用机制

    [Abstract] Dried stem bark from Albizia julibrissin(AJ) is a common traditional Chinese herb with several therapy effects including insomnia, anxiety and anti-tumor. Recently, the anti-tumor effect and mechanism studies of AJ have drawn much attention; however, there are still some troubles in chemical composition separation, which leads to the difficulties in pharmacological research of AJ. In this study, we firstly confirmed the proliferation inhibitory effect of total saponins from AJ(TSAJ)on human hepatocarcinoma(HepG2) cells, and also tested the apoptosis induction effect of TSAJ. Then, we successfully captured the potential target proteins from HepG2 lysates by using TSAJ-modified solid beads, and identified the target proteins by LC-MS/MS. Finally, we confirmed 5 target proteins including Exportin-2, Beta-actin-like protein 2, Myosin-9, Protein transport protein Sec61 subunit beta,and Cytochrome c oxidase copper chaperone, which are responsible forcell apoptosis, proliferation, differentiation andmigration. In summary, our findings elucidate the potential anti-tumor mechanism of TSAJ from the direct target proteins, and provide a new insight for exploring the pharmacological mechanism of traditional Chinese medicine.
, 百拇医药
    [Key words] total saponins from Albizia julibrissin; anti-tumor; target; pathway; mechanism

    合歡皮首载于《神农本草经》,是豆科植物合欢Albizia julibrissin Durazz.的干燥树皮,具有安神解郁,活血消肿的功效[1],常用于心神不安、忧郁失眠、肺痈疮肿、跌扑伤痛等。现代药理研究表明,合欢具有镇静、抗肿瘤、抗生育,抗菌等多种作用[2-5]。合欢皮总皂苷(TSAJ)是合欢皮的主要化学成分[6],近年来对其抗肿瘤作用多有报道。本课题组前期研究发现,TSAJ体内体外抗肿瘤效果都十分显著,体内给药荷瘤小鼠抑瘤率高达30% [7]。但由于皂苷类单体成分分离困难,合欢皮皂苷的抗肿瘤机制研究却鲜有深入报道。

    药物靶点的阐明是了解药物作用机制的重要前提,对从源头上揭示药物的分子机制具有重要的指导意义[8]。作者通过把中药活性成分与固相亲和微球表面进行键合,利用中药活性成分作为探针,直接从细胞中“钩钓”直接作用靶点,进而对靶点蛋白的生物学功能进行分析并解释其药理机制。在本研究中,作者构建了表面修饰TSAJ的固相微球,特异性地富集了人肝癌细胞裂解液中的靶点蛋白,然后进行高分辨质谱分析和鉴定,最终采用MataboAnalysis 3.0筛选并确定靶点蛋白。通过对靶点蛋白生物学功能解析,阐释了TSAJ的潜在分子药理机制,为诠释中药多成分、多靶点的作用机制提供了新的思路。, http://www.100md.com(钱薏 韩清华 刘丹 屠鹏飞 曾克武 梁鸿)
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