The clinical use of chemotherapeutic drugs in colorectal cancer treatment is limited by the occurrence of multidrug resistance (MDR). However, the underlying mechanism remains unknown. Our previous studies showed that COX-2 induced up-regulation of MDR1/P-gp, which was associated with an enhanced activity of JNK signal transduction. Clinical practice have proved that Jian-Pi-Jie-Du herbal formula reversed drug-resistance in colorectal cancer, but the target is still unclear. In this study, we built COX-2 recombinant lentivirus by overexpression and RNAi. Molecular cloning, siRNA, Real-time PCR, Western blot and other experimental techniques will be used to explore the mechanism of drug-resistance aroused by oxaliplatin in vitro and in vivo, as well as to investigate the effects of Jian-Pi-Jie-Du herbs on COX-2/JNK signaling in colorectal cancer. It will be helpful to find the target in the prevention and treatment of drug-resistance tumor.
多药耐药(MDR)是影响结直肠癌临床化疗疗效的重要因素之一,但诱发多药耐药的机制原理尚不清楚。前期研究发现COX-2通过激活JNK信号通路介导MDR1/P-gp的过表达,是引起多药耐药的重要诱因。同时临床用药也证实健脾解毒中药复方能够通过抑制P-gp的表达逆转肠癌耐药,但具体作用靶点仍未明确。因此本研究构建COX-2过表达和siRNA干扰慢病毒载体,采用分子克隆,基因沉默,Real-time PCR, Western blot等技术,针对结肠癌耐奥沙利铂现象,进行体内体外研究,探讨健脾解毒中药对COX-2/JNK信号传递介导的结直肠癌多药耐药的调控机制。这对于进一步完善诱导多药耐药发生的信号转导途径,明确中药防治肿瘤多药耐药的作用靶点,具有重要意义。
多药耐药(MDR)是影响结直肠癌临床化疗疗效的重要因素之一,但诱发多药耐药的机制原理尚不清楚。前期研究发现COX-2通过激活JNK信号通路介导MDR1/P-gp的过表达,是引起多药耐药的重要诱因。同时临床用药也证实健脾解毒中药复方能够通过抑制P-gp的表达逆转肠癌耐药,但具体作用靶点仍未明确。.因此本研究构建COX-2过表达和siRNA干扰慢病毒载体,采用分子克隆,慢病毒感染等技术,建立COX-2过表达大肠癌裸鼠皮下移植瘤耐药模型,通过小动物活体成像技术观察COX-2/JNK信号通路在裸鼠体内的活化情况,证实COX-2基因的上调激活JNK信号通路是大肠癌发生多药耐药的重要因素。发现健脾解毒中药具有抑制COX-2蛋白编码,阻断JNK信号通路激活的调节作用;证实健脾解毒中药通过COX-2/JNK/P-gp信号途径增加大肠癌化疗敏感性,逆转耐药的抗肿瘤作用。对于进一步完善诱导多药耐药发生的信号转导途径,明确中药防治肿瘤多药耐药的作用靶点,具有重要意义。.此外,在深入研究JNK信号通路对大肠癌多药耐药的调节作用的过程中,我们发现miR-200c能够靶向调节JNK2基因的非编码区域,对大肠癌耐药起着负反馈的调节作用。该研究成果发表在美国癌症协会(AACR)的Mol Cancer Ther(Hua Sui, 2014, 13:3137-51, IF:6.103)杂志,同时获得国家发明专利授权1项。.标注该课题的文章15篇,其中SCI收录8篇(1篇已接受,待刊印)。申请国家发明专利3项,授权1项,培养硕博士研究生3名。获得省部级科技进步奖2项,入选省部级人才培养计划1项。
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数据更新时间:2023-05-31
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