CN114533878A - Mgst1抑制剂的应用及治疗肝癌药物混合物 - Google Patents
Mgst1抑制剂的应用及治疗肝癌药物混合物 Download PDFInfo
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Abstract
目前大部分肿瘤的治疗方案都是手术切除辅助化疗,化疗耐药性现已成为影响肿瘤患者预后的重要因素。本发明中公开了一种MGST1抑制剂的应用及治疗肝癌药物混合物,具体为一个特异性的分子标志物,可作为抗肿瘤耐药的重要靶点。本发明中首次揭示了MGST1与肝癌耐药的密切关系,并提供了MGST1的抑制剂在制备降低或消除肝癌化疗耐药性的药物中的用途、其作为肝癌耐药标志物及其作为肝癌耐药预测、诊断以及药物设计和筛选的靶点的应用。本发明为克服肝癌耐药、提高疗效提供新的机理,为抗肝癌耐药提供新的靶点。
Description
技术领域
本发明属于分子生物学和肿瘤防治领域,更具体而言,本发明涉及耐药肿瘤的治疗领域。本发明提供了一种新的肿瘤耐药标志物:在肿瘤组织中高表达并导致肿瘤耐药的微粒体谷胱甘肽S-转移酶1(Microsomal glutathione S-transferase 1,MGST1),将该蛋白作为靶点,可筛选针对该蛋白及其相关分子的治疗肿瘤耐药的药物。
背景技术
肝癌是严重威胁人类生命健康的恶性肿瘤之一,其具有早期诊断困难、恶性程度高、预后差的特点,全身系统地化疗是肝癌的主要治疗手段之一,然后,肝癌细胞化疗耐药性的出现成为治疗的主要障碍。因此,为了逆转肿瘤耐药、提高化疗疗效,本领域迫切需要通过多种方式研究肿瘤耐药的关键基因靶点,并根据这些靶点设计治疗肿瘤耐药的新药,从而引导肿瘤耐药靶向性治疗。
微粒体谷胱甘肽S-转移酶1(MGST1)是一种膜蛋白,属于II期解毒酶,可通过中和活性氧来保护细胞存活,其定位于内质网和线粒体膜外壁,保护线粒体膜免受脂质过氧化和氧化应激损伤。在许多癌症中发现了MGST1的异常表达,对于MGST1在癌症耐药方面的功能已有初步报道,MGST1过表达介导细胞淋巴瘤对盐酸苯达莫司汀的耐药性(T.Takimoto-Shimomura,H.Nagoshi,S.Maegawa,Establishment and Characteristics of a NovelMantle Cell Lymphoma-derived Cell Line and a Bendamustine-resistant Subline,Cancer Genomics Proteomics 15(3)(2018)213–223),并保护MCF7细胞免受几种细胞抑制剂的影响,如氯苯丁腈、马法兰和顺铂等药物(K.Johansson,M.Ito,C.M.Schophuizen,S.Mathew Thengumtharayil,Characterization of new potential anticancer drugsdesigned to overcome glutathione transferase mediated resistance,Mol.Pharm.8(5)(2011)1698–1708)。然而,MGST1在肝癌耐药中的作用尚不清楚。为了研究MGST1在肝癌耐药中发挥的作用,本发明采用基于质谱的定量蛋白质组学技术筛选和生物学功能研究,运用Western blotting、平板克隆形成、流式细胞术等方法检测MGST1对肝癌耐药细胞增殖及凋亡的影响。
发明内容
本发明的目的是提供一种针对MGST1的抑制剂作为降低或消除肝癌耐药治疗的应用。
为了实现上述目的,本发明通过如下技术方案进行实现:
本发明提供了抑制MGST1的方法,是通过抑制剂实现。
进一步,所述抑制剂包括了:针对MGST1蛋白抑制的抗MGST1的抗体、针对MGST1编码序列的RNA干扰分子或反义寡核苷酸。
更进一步,所述抗MGST1的抗体,包括:对MGST1或其活性片段具有免疫活性,能够特异性识别并结合MGST1的氨基酸序列或其空间结构的单克隆抗体、多克隆抗体和具有免疫活性的抗体片段。
本发明所述的针对MGST1编码序列的RNA干扰分子,选自shRNA、siRNA、miRNA、dsRNA。
进一步,所述的RNA干扰分子siRNA的优选序列为siRNA1,正义链:
5'-GCUUAUGAGUACUGCAACUTT-3'和反义链:
5'-AGUUGCAGUACUCAUAAGCTT-3';siRNA2,正义链:5'
AGUUGCAGUACUCAUAAGCTT-3'和反义链:
5'-AAUACAGGAGGCCAAUUCCTT-3';siRNA3,正义链:
5'-GGAUAUGGAGUUACUCUUUTT-3'和反义链:
5'-AAAGAGUAACUCCAUAUCCTT-3'。
本发明所述的反义寡核苷酸,特异地与MGST1基因DNA或mRNA结合而抑制MGST1基因表达,在基因水平调控的分子药物,包括人工合成或体内表达的反义DNA和反义RNA。
本发明所述的肝癌包括:原发性肝癌,继发性肝癌,以及原发性肝癌或继发性肝癌的离体培养细胞。
进一步,原发性肝癌包括:肝细胞肝癌、肝内胆管癌,肝细胞癌混合肝内胆管癌;继发性肝癌包括:肠癌、胰腺癌转移胆囊癌、胆管癌。
本发明所述的药物,包括:顺铂、吉非替尼、阿霉素、紫杉醇、5-氟尿嘧啶、索拉非尼、西地尼布、帕唑帕尼、阿西替尼、瓦他拉尼、司马沙尼、舒尼替尼、雷莫芦单抗及阿柏西普。
本发明中首次揭示了MGST1与肝癌耐药的密切关系,并提供了MGST1的抑制剂在制备降低或消除肝癌化疗耐药性的药物中的用途、其作为肝癌耐药标志物及其作为肝癌耐药预测、诊断以及药物设计和筛选的靶点的应用。本发明为克服肝癌耐药、提高疗效提供新的机理,为抗肝癌耐药提供新的靶点。
附图说明
图1.MGST1蛋白在肝癌索拉非尼耐药细胞HepG2-R中高表达;
图2.siRNA转染敲低MGST1蛋白表达水平;
图3.平板克隆实验显示抑制MGST1表达提高了肝癌耐药细胞对索拉非尼药物敏感性。
具体实施方式
下面结合具体实施例,具体阐述本发明。下列实施例中,索拉非尼耐药株HepG2-R按照文献方法构建(Yeh,C.C.;Hsu,C.H.;Shao,Y.Y.;Ho,W.C.Integrated Stable IsotopeLabeling by Amino Acids in Cell Culture(SILAC)and Isobaric Tags for Relativeand Absolute Quantitation(iTRAQ)Quantitative Proteomic Analysis IdentifiesGalectin-1as a Potential Biomarker for Predicting Sorafenib Resistance inLiver Cancer.Mol Cell Proteomics.14(6)(2015)1527-45.);未注明具体条件的实验方法,通常是按照常规条件,如Sambrook等人著,分子克隆:实验室指南(New York:ColdSpring Harbor Laboratory Press,1989)中所述条件,或按照制造厂商所建议的条件。所用溶液中百分比如无特殊说明均为体积比。
实施例1.MGST1蛋白在肝癌索拉非尼耐药细胞HepG2-R中高表达
为研究MGST1在正常肝癌细胞和肝癌耐药细胞中的表达水平,通过对肝癌细胞HepG2及索拉非尼耐药细胞HepG2-R无标定量蛋白质组学分析发现,MGST1在HepG2-R中的丰度明显高于HepG2中。采用蛋白质印迹法(参考《分子克隆》)进一步检测两种细胞中MGST1蛋白表达水平。
分别在10cm培养皿培养HepG2及HepG2-R细胞,当细胞密度达80%-90%时(约5×106个细胞),首先用6ml PBS(pH 7.4)(购买于美国Gibco公司)洗3次,再加入300μl的RIPA裂解液(购买于上海碧云天生物技术有限公司,裂解液主要成分为50mM Tris(pH 7.4),150mM NaCl,1%Triton X-100,1%sodium deoxycholate,0.1%SDS,以及sodiumorthovanadate,sodium fluoride,EDTA,leupeptin等多种抑制剂),培养皿置于冰上裂解细胞15min,12000g离心15min,去除沉淀获得蛋白质上清液。分别用BCA试剂盒(购买于上海碧云天生物技术有限公司)测定蛋白质浓度。分别采用蛋白质印迹法检测MGST1蛋白质表达水平,每个泳道的蛋白样品上样量为50μg。Bio rad电泳仪,Bio rad转膜仪购买于美国Biorad公司,MGST1的抗体购买于美国Gene Tex公司,货号GTX114551。β-actin抗体做内参,购买于美国Sigma公司,货号A5441。
结果显示MGST1在肝癌索拉非尼耐药细胞HepG2-R中蛋白表达水平明显高于对照细胞HepG2(图1),表明MGST1的表达与肝癌耐药具有关联。
实施例2.抑制MGST1表达提高了肝癌耐药细胞对索拉非尼药物敏感性
1.siRNA设计合成
根据MGST1基因序列由上海吉玛制药技术有限公司设计合成siRNA1;
并同时提供与MGST1基因无序列同源性的阴性对照siRNA(siRNA NC)。
siRNA NC
正义链:5'-UUCUCCGAACGUGUCACGUTT-3'
反义链:5'-ACGUGACACGUUCGGAGAATT-3'
siRNA1 MGST1
正义链:5'-GCUUAUGAGUACUGCAACUTT-3'
反义链:5'-AGUUGCAGUACUCAUAAGCTT-3';
2.细胞转染
取生长良好且处于对数生长期的HepG2-R细胞(105个)铺至六孔板,采用转染试剂盒Lipofectamine RNAiMAX(购自Invitrogen公司)进行转染,对照组转染siRNA NC,实验组转染siRNA1 MGST1,实验操作及试剂用量参照转染试剂盒说明书即可。培养48小时后,采用蛋白质印迹法(参考《分子克隆》)检测蛋白质表达水平。MGST1抗体购自美国Genetex公司,货号GTX114551。HSP90抗体做内参,购买于美国Santacruz Biotochnotogy公司,货号SC-13119。蛋白质印迹法结果显示实验组转染siRNA1 MGST1后,MGST1的表达水平相比于对照组降低(图2),说明转染成功,siRNA1 MGST1可以实现MGST1的表达敲低。
3.平板克隆
在10cm培养皿中培养肝癌索拉非尼耐药细胞HepG2-R,对数生长期时加入0.5ml胰酶消化2min,加入6ml DMEM培养基吹打细胞液,细胞计数后稀释,分别取2ml细胞液(含104个细胞)至六孔板每孔中。48h后,细胞贴壁生长良好时,进行细胞转染。采用转染试剂盒Lipofectamine RNAiMAX进行转染,对照组转染siRNA NC,实验组转染siRNA1 MGST1,实验操作及试剂用量参照转染试剂盒说明书即可。继续培养24h后分别加索拉非尼至终浓度0μM,8μM,继续培养细胞,观察细胞生长状态。7天左右进行结晶紫染色。采用体积浓度20%乙酸500μl溶解结晶紫20min,检测590nm处吸光值。
结果显示,加索拉非尼0μM时,siRNA1 MGST1组敲低MGST1蛋白表达会抑制细胞的存活,促进凋亡,说明MGST1抑制细胞凋亡。随着索拉非尼药物浓度增加,siRNA1 MGST1组细胞存活率明显低于siRNANC组,每组差异均具有统计学意义(*p<0.05)(图3),结果表明抑制MGST1表达提高了肝癌耐药细胞对索拉非尼药物敏感性,提高索拉非尼药物对肝癌的治疗效果。
实施例3.抑制MGST1表达提高肝癌耐药细胞对吉非替尼药物敏感性
1.siRNA设计
根据MGST1基因序列由上海吉玛制药技术有限公司设计合成siRNA2,并同时提供与MGST1基因无序列同源性的阴性对照siRNA(siRNA NC)。
siRNA NC
正义链:5'-UUCUCCGAACGUGUCACGUTT-3'
反义链:5'-ACGUGACACGUUCGGAGAATT-3'
siRNA2 MGST1
正义链:5'-CCACUGUUCUGUGCAAUGATT-3'
反义链:5'-AAUACAGGAGGCCAAUUCCTT-3';
取生长良好且处于对数期的肝癌吉非替尼耐药细胞HepG2-SR细胞铺至六孔板,待细胞汇合率达50%时,采用脂质体Lipofectamine2000为转染试剂,对照组转染siRNA NC,实验组转染siRNA2MGST1,实验操作参照Lipofectamine2000试剂说明书即可。采用蛋白质印迹法(参考《分子克隆》)检测蛋白质表达水平。MGST1抗体购自美国Genetex公司,货号GTX114551。蛋白质印迹法结果显示实验组转染siRNA2MGST1后,MGST1的表达水平相比于对照组降低(图2),说明转染成功,siRNA2 MGST1可以实现MGST1的表达敲低。
2.细胞转染和收集
培养肝癌吉非替尼耐药细胞HepG2-SR细胞,生长良好时胰酶消化,培养基终止吹打,得细胞悬浮液,稀释后,六孔板每孔加2ml细胞液含105个细胞。48h后,细胞贴壁生长良好时,进行细胞转染。采用脂质体Lipofectamine2000为转染试剂,siRNA NC与siRNA2MGST1各转染2μL siRNA加至300μLopti-mem培养基,10μL RNAi试剂加至300μLopti-mem培养基,吹打混匀30分钟后加入,转染6小时后换成正常培养基。24-48h后分别换液,加吉非替尼0μM,2μM,4μM,继续培养细胞48h,观察细胞生长状态。
3.细胞凋亡检测
加入100μL胰酶消化2min后收集细胞,3mL PBS清洗3次,离心收集细胞沉淀,采用美国BD公司细胞凋亡检测试剂盒(货号556547),按照试剂盒说明书进行操作,使用1×binding buffer重悬细胞,5μL FITC加5μL PI避光染色15min,上机检测荧光强度,并进行统计学分析。
结果显示,在加药吉非替尼终浓度0μM,2μM,4μM时,siRNA2 MGST1组细胞凋亡率为分别是(7.09±2.4)%,(14.38±2.6)%,(24.65±3.7)%,明显高于siRNA NC组的凋亡率(4.69±2.1)%,(9.62±3.2)%,(17.25±3.4)%,结果表明抑制MGST1表达导致肝癌细胞对吉非替尼药物敏感性增加,提高吉非替尼药物对肝癌的治疗效果。
实施例4.抑制MGST1表达提高肝癌耐药细胞对5-氟尿嘧啶药物敏感性
1.siRNA设计合成
根据MGST1基因序列由上海吉玛制药技术有限公司设计合成siRNA2,并同时提供与MGST1基因无序列同源性的阴性对照siRNA(siRNA NC)。
siRNA NC
正义链:5'-UUCUCCGAACGUGUCACGUTT-3'
反义链:5'-ACGUGACACGUUCGGAGAATT-3'
siRNA2 MGST1
正义链:5'-CCACUGUUCUGUGCAAUGATT-3'
反义链:5'-AAUACAGGAGGCCAAUUCCTT-3';
2.细胞转染和收集
在10cm培养皿中培养肝癌耐药细胞Bel-7402-5-氟尿嘧啶细胞,对数生长期时加入0.5mL胰酶消化2min,加入6Mlrpmi 1640培养基吹打细胞得到细胞悬液,计数稀释后,六孔板每孔加2ml细胞液(含104个细胞)。48h后,细胞贴壁生长良好时,进行细胞转染。采用转染试剂盒LipofectamineRNAiMAX进行转染,对照组转染siRNA NC,实验组转染siRNA2MGST1,实验操作及实际用量参照转染试剂盒说明书即可。继续培养24h后分别加加5-氟尿嘧啶0μM,10μM,20μM,继续培养细胞48h,观察细胞生长状态。
3.细胞凋亡检测
加入100μL胰酶消化2min后收集细胞,3mL PBS清洗3次,离心收集细胞沉淀,采用美国BD公司细胞凋亡检测试剂盒(货号556547),按照试剂盒说明书进行操作,使用1×binding buffer重悬细胞,5μL FITC加5μL PI避光染色15min,上机检测荧光强度,并进行统计学分析。
结果显示,在5-氟尿嘧啶药物终浓度为0μM,10μM,20μM时,siRNA2FOLR1组细胞凋亡率为(7.13±1.2)%,(18.95±2.9)%,(34.26±4.7)%,明显高于siRNA NC组的凋亡率(3.96±1.8)%,(12.54±3.1)%,(19.76±3.6)%,结果表明抑制MGST1表达提高肝癌耐药细胞5-氟尿嘧啶药物敏感性,提高5-氟尿嘧啶药物对肝癌的治疗效果。
综上所述,通过抑制肝癌耐药细胞中MGST1的表达,可以增强肝癌的化疗治疗效果。
上述实施例为本发明较佳的实施方式,但本发明的实施方式并不受上述实施例的限制,其他的任何未背离本发明的精神实质与原理下所作的改变、修饰、替代、组合、简化,均应为等效的置换方式,都包含在本发明的保护范围之内。
序列表
<110> 中国科学院大连化学物理研究所
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Claims (10)
1.MGST1抑制剂的应用,其特征在于:MGST1抑制剂在制备降低或消除肝癌药物治疗中的耐药性的药物中的用途。
2.如权利要求1所述的用途,其特征在于,所述抑制剂选自:针对MGST1蛋白抑制的抗MGST1的抗体、针对MGST1编码序列的RNA干扰分子或反义寡核苷酸中的一种或两种以上。
3.如权利要求1所述的应用,其特征在于,所述肝癌药物为顺铂、吉非替尼、阿霉素、紫杉醇、5-氟尿嘧啶、索拉非尼、西地尼布、帕唑帕尼、阿西替尼、瓦他拉尼、司马沙尼、舒尼替尼、雷莫芦单抗及阿柏西普中的一种或两种以上。
4.如权利要求1或3所述的应用,其特征在于:所述的肝癌包括原发性肝癌和继发性肝癌中的一种或者两种组合;或原发性肝癌或继发性肝癌的离体培养细胞中的一种或者两种。
5.如权利要求4所述的应用,其特征在于:其中原发性肝癌包括:肝细胞肝癌、肝内胆管癌,肝细胞癌混合肝内胆管癌中的一种或者两种;继发性肝癌包括:肠癌、胰腺癌转移胆囊癌、胆管癌中的一种或者两种。
6.如权利要求2所述的应用,其特征在于:抗MGST1的抗体包括:对MGST1或其活性片段具有免疫活性,能够特异性识别并结合MGST1的氨基酸序列或其空间结构的单克隆抗体、多克隆抗体和具有免疫活性的抗体片段中的一种或两种以上;所述的针对MGST1编码序列的RNA干扰分子选自:shRNA、siRNA、miRNA、dsRNA中的至少一种或两种以上;所述的反义寡核苷酸为:特异地与MGST1基因DNA或mRNA结合而抑制MGST1基因表达,在基因水平调控的分子药物,包括人工合成或体内表达的反义DNA和反义RNA中的一种或两种以上。
7.如权利要求1或6所述的应用,其特征在于:所述抑制剂为针对MGST1编码序列的RNA干扰分子,RNA干扰分子siRNA的优选序列为下述中的一种或两种以上,
siRNA1,正义链:5'-GCUUAUGAGUACUGCAACUTT-3'和反义链:5'-AGUUGCAGUACUCAUAAGCTT-3';
siRNA2,正义链:5'-CCACUGUUCUGUGCAAUGATT-3'和反义链:5'-AAUACAGGAGGCCAAUUCCTT-3';
siRNA3,正义链:5'-GGAUAUGGAGUUACUCUUUTT-3'和反义链:5'-AAAGAGUAACUCCAUAUCCTT-3'。
8.一种治疗肝癌药物混合物,包含MGST1抑制剂,以及肝癌药物或肝癌药物活性成份中的一种或二种以上。
9.如权利要求8所述的治疗肝癌药物混合物,所述MGST1抑制剂为权利要求2、6或7中所述MGST1抑制剂中的一种或二种以上。
10.如权利要求8所述的治疗肝癌药物混合物,所述肝癌药物为权利要求3中所述肝癌药物中的一种或二种以上。
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