CN105524161A - 抗肿瘤小分子多肽piddδ及其载体和应用 - Google Patents
抗肿瘤小分子多肽piddδ及其载体和应用 Download PDFInfo
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Abstract
本发明公开了一种抗肿瘤小分子多肽PIDDΔ及其载体和应用。该抗肿瘤小分子多肽PIDDΔ为长度306个氨基酸的多肽,能特异性结合Keap1,阻断内源性PIDD-Keap1相互作用;细胞生物学实验表明多肽PIDDΔ具有抑制肺癌细胞活性、促进肺癌细胞凋亡的重要抗癌功能。发明为肺肿瘤治疗开发新的靶点提供实验依据,对于应用于肺肿瘤的临床治疗具有十分重要的开发应用前景。
Description
技术领域
本发明属于基因工程技术领域,具体是一种抗肿瘤小分子多肽PIDDΔ及其载体和应用。
背景技术
目前,肺癌的发病率和死亡率均居癌症之首,是对人群健康和生命威胁最大的恶性肿瘤之一。在中国,由于吸烟人数的快速上升,大气污染的日趋严重等因素,近年来肺癌发病率和死亡率一直呈明显攀升趋势。尽管近几年肺癌治疗包括化疗有了长足的进步,但是预后仍然不容乐观。过去25年肺癌患者化疗后的5年生存率仍未见显著提高,仅为15%。因此,加强治疗肺癌的研究,探索新的治疗途径具有十分重要的意义。
多肽药物是目前生物医药领域最具成长性的崭新领域,以其高效、安全、特异性强等特点逐渐用于癌症,传染病等预防和治疗。基因的功能最终要通过其表达产物——蛋白质来实现,生物体的一切活动或功能都离不开蛋白质的物质基础。发现和鉴定具有重要功能的蛋白质,可为新药的开发带来决定性的影响。并且多肽类药物具有分子量小,在人体内不结存,无副作用,免疫原性小,活性好等优点成为一个研究的热点。
发明内容
发明目的:针对现有技术中存在的不足,本发明的目的在于提供一种抗肿瘤小分子多肽PIDDΔ,其具有抑制肺癌细胞增殖的功效。本发明的另一目的是提供一种能表达上述抗肿瘤小分子多肽PIDDΔ的载体。本发明还有一目的是提供上述抗肿瘤小分子多肽PIDDΔ的应用。
技术方案:为了实现上述发明目的,本发明采用的技术方案为:
抗肿瘤小分子多肽PIDDΔ,其氨基酸序列如SEQIDNO.1所示。
所述的抗肿瘤小分子多肽PIDDΔ的编码基因,其DNA序列如SEQIDNO.2所示。
含有所述的抗肿瘤小分子多肽PIDDΔ的编码基因的载体。
所述的载体,将抗肿瘤小分子多肽PIDDΔ的编码基因克隆到pCMV-HA真核表达载体构建而成。
所述小分子多肽PIDDΔ在制备抗肺癌药物中的应用。
本发明人的前期研究结果表明,PIDD可以通过与Keap1分子相互作用,导致促癌信号通路Nrf2的激活,进而上调多药耐药蛋白MRP1的表达,促进肺癌细胞的耐药存活。因此,阻断内源性PIDD与Keap1相互作用,便可抑制Nrf2信号通路的激活,进而抑制肿瘤细胞的生长及肿瘤细胞的增殖等作用。
有益效果:与现有技术相比,本发明具有如下的优点及效果:本发明提供的抗肿瘤小分子多肽能特异性结合Keap1,阻断细胞内源性PIDD与Keap1相互作用,抑制Nrf2信号通路激活,达到抗肿瘤的效果,在抗肿瘤药物制备中具有广泛的应用。
附图说明
图1是载体质粒pCMV-HA的结构示意图;
图2是多肽PIDDΔ重组真核表达载体酶切鉴定结果图;
图3是免疫印迹检测重组多肽PIDDΔ的表达结果图;
图4是CCK-8实验检测306aa多肽PIDDΔ对H1299细胞活性的抑制结果图;
图5是PI染色流式细胞术检测306aa多肽PIDDΔ抑制肺癌细胞进入S期图;
图6是克隆形成实验检测306aa多肽PIDDΔ抑制H1299细胞增殖结果图。
具体实施方式
下面结合具体实施例对本发明作进一步的说明。实施例中未注明具体条件的实验方法,通常按照常规条件,例如分子克隆实验指南(第三版,J.萨姆布鲁克等著,黄培堂等译,科学出版社,2002年)中所述的条件,或按照制造厂商所建议的条件进行。
实施例1:306aa多肽PIDDΔ重组
1)重组肽的克隆载体构建
提取人的mRNA,逆转录为cDNA,以cDNA为模板,上游引物P1为5’-GCGAATTCCTGGCCCATCTGGCCCAC-3’(含EcoRI酶切位点);下游引物P2为5’-GAAGATCTCTAGAAGTGGGGCACCTGGC-3’(含BglII酶切位点),应用PCR技术成功扩增出306aa(SEQIDNO.1)对应的918bp的mRNA序列(SEQIDNO.2)。扩增得到的片段与pCMV-HA载体连接(载体图见图1),将连接产物(PIDD质粒)转入感受态大肠杆菌DH5α中,在含Amp琼脂平板上挑选克隆,以碱裂解法小提重组质粒后,以EcoRI、BglII酶切鉴定(图2)。
2)重组肽的真核表达载体构建及其表达鉴定
将含有306aa多肽PIDD核酸片段的pCMV-HA质粒经EcoRI酶切后,利用回收试剂盒获得该片段,同时用相同的酶处理质粒pcDNA3.1(约5kb),然后将回收多肽核酸片段和经酶切的载体pCMV-HA在T4DNA连接酶作用下于16℃连接过夜。酶切鉴定重组体。将正确连接的306aa多肽真核表达载体转染H1299细胞,48小时后搜集样品,RIPA细胞裂解液裂解,免疫印迹结果证明了多肽的表达(图3),分子量大小34KD。
主要过程如下:
以cDNA为模板,分别取上下游引物P1和P2各5μL,加入1μLpfuDNA聚合酶,10×bnuffer5μL,10×dNTP5μL,加双蒸水总体积为50μL进行PCR反应,起始变性94℃5min,然后执行如下反应条件:94℃30s,65℃30s,72℃45s,30个循环,最后72℃延伸10min。
取PCR产物10μL,进行行1.2%普通琼脂糖凝胶电泳,结果扩增出一条约918bp的片段。取余下PCR产物40μL,进行1.2%低熔点琼脂糖凝胶电泳,回收并纯化918bp的PIDDcDNA片段。
将PIDD质粒和HA质粒分别用EcoRI和BglII双酶切,前者回收918bp的PIDD片段,后者回收线性化的HA片段,然后行1.2%低熔点琼脂糖凝胶电泳回收,将918bp的PIDD片段和3800bp的线性化的HA片段分别切下混在一起进行纯化。纯化后PIDD片段和HA片段混合物用4μL双蒸水溶解,加入T4DNA连接缓冲液2μL,T4DNA连接酶1μL(3U/μL),总反应体积为10μL,室温连接4h。将10μL连接产物转化大肠杆菌DH5α,并铺在含氨苄青霉素(100μg/mL)的琼脂培养基上生长12h,挑选单个菌落接种于含氨苄青霉素(100μg/mL)TB培养基中培养12h,少量提取质粒,通过EcoRI和BglII双酶切鉴定。然后进行大量提取、纯化,用40μL消毒三蒸水溶解沉淀,命名为“pCMV-HA-PIDD”,-20℃保存以备用。
从40μLpCMV-HA-PIDD中取10μL,由上海铂尚测序公司进行测序。
pCMV-HA-PIDD重组片段表达鉴定:细胞传代:转染前一天,将0.5-1.5×10H1299细胞用1640培养基传代至6cm培养皿中,使得第二天转染时融合度在80-90%左右;将2-4ug的质粒加入200μL的无血清培养基中,混匀;将Lipofectamine2000取出,轻柔摇匀,再将质粒量1-3倍量的Lipofectamine2000用另一200μL的无血清培养基稀释,吹打混匀,静置5min;将质粒和Lipofectamine2000混匀,室温静置20min;将混合物加入培养皿中,轻柔地摇匀,静置,36-48h后收集细胞;RIPA细胞裂解液裂解,免疫印迹检测多肽的表达。
实施例2:重组肽抗肺癌功能的检测
1)CCK-8实验证明重组肽细胞水平的抗肺癌效应
CCK-8细胞增殖实验:在H1299细胞中,转染野生型,306aa片段截短的PIDD载体48h后收集细胞,每孔5000个细胞接种到96孔板,每孔体积100μL。每孔换液(CCK-8与培养液的比例为1:10),37℃孵育2h,终止培养,酶标仪以490nm波长测量各孔的吸光度值,每组设四复孔。每24h测定各组CCK-8吸光度值一次,共检测3天,以时间为横坐标,吸光值为纵坐标绘制细胞生长曲线。
主要方法为:在96孔板中接种H1299细胞悬液(100μL/孔),密度为104-105/mL,将培养板在培养箱预培养过夜(在37℃,5%CO2的条件下),刺激细胞。到达时间点后换液,向每孔加入100μL含10μLCCK-8溶液的细胞培养基(注意不要在孔中生成气泡,它们会影响OD值的读数)。将培养板在培养箱内孵育1.5-2h。(不同时间点要保持相同的时间)用酶标仪测定(测定波长490nm,参照波长630nm)处的吸光度。
结果如图4所示,转染306aa的多肽片段PIDDΔ的细胞增殖速度低于与对照组。
2)PI染色流式细胞术实验证明重组肽细胞水平的抗肺癌效应
PI染色流式细胞分析术检测细胞周期:在H1299细胞中,转染野生型、306aa片段截短的PIDD载体48h后收集到5mLEP管中离心后弃掉培养基,用预冷的细胞PBS重悬洗涤3次,离心,弃掉PBS,用70%乙醇重悬,置于-20℃固定至少24h。检测前,离心收集的细胞,弃乙醇,用PBS洗涤3次,并用含1%TritonX-100的PBS,4℃通透,每管200μL。后加入RNaseA,避光4℃反应,每管300-400μL。加入200μLPI染色剂,避光4℃染色20min,每管200μL,流式细胞仪检测。
主要过程为:收集细胞:培养细胞到合适时间点,胰酶消化后,用完培终止并收集到5mLEP管中离心,1200rpm离心5min,弃掉培养基,用预冷的细胞PBS重悬洗涤2次。固定:再离心,弃掉PBS,用70%乙醇重悬,置于-20℃固定至少24小时。1200rpm离心5min,弃乙醇,用PBS洗涤3次,并用含1%tritonX-100的PBS4℃通透10min,每管200μL。加入RNaseA,与tritonX-100的PBS比例为1:1000,避光4℃反应20min,每管300-400μL。加入200μLPI染色剂,避光4℃染色20min,每管200μL,过滤(400目筛子)。置于冰盒内,流式细胞仪检测。
结果如图5所示,对照组细胞停滞在G1期的为71.52%,而转染306aa的多肽片段PIDDΔ的细胞停滞在G1期的为73.04%,并且进入S期的细胞由21.04%逐渐增加到22.31%。与对照组相比,转染306aa的多肽片段PIDDΔ后能够将细胞周期阻滞在G1/S期,有明显的细胞周期抑制作用。
3)克隆形成实验证明重组肽细胞水平的抗肺癌效应
在H1299细胞中,转染野生型、306aa片段截短的PIDD载体36~48h后,分别将1000个细胞铺与6mm中皿中,培养15-20天,结晶紫染色后拍摄图像。
主要过程为:取对数生长期的H1299细胞,用0.25%胰蛋白酶消化并吹打成单个细胞,把细胞悬浮在10%胎牛血清的RPMI1640培养液中备用。将细胞悬液作梯度倍数稀释,以适当的细胞密度(根据增殖能力)接种于培养皿中。以每皿1000个细胞的梯度密度接种含3mL37℃预温培养液的6mm中皿中,并轻轻转动,使细胞分散均匀。置37℃5%CO2及饱和湿度的环境下,静置培养2~3周。经常观察,当培养皿中出现肉眼可见的克隆时,终止培养。弃去上清液,用PBS小心浸洗2次。加纯甲醇或1:3醋酸/甲醇5mL,固定15分钟。然后去固定液,加适量Giemsa应用染色液染10~30分钟,然后用流水缓慢洗去染色液,空气干燥。将平皿倒置并叠加一张带网格的透明胶片,用肉眼直接计数克隆。
结果如图6所示,相同的培养时间内,转染了54aa多肽的细胞组集落形成的数量明显少于对照组。
SEQUENCELISTING
<110>南通大学
<120>抗肿瘤小分子多肽PIDDΔ及其载体和应用
<130>100
<160>4
<170>PatentInversion3.3
<210>1
<211>306
<212>PRT
<213>Artificial
<220>
<223>人的PIDDΔ蛋白
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SerTrpTyrTrpLeuTrpTyrThrThrLysAsnCysValGlyGlyLeu
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AlaArgLysAlaTrpGluArgLeuArgLeuHisArgValAsnLeuIle
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AlaLeuGlnArgArgArgAspProGluGlnValLeuLeuGlnCysLeu
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ProArgAsnLysValAspAlaThrLeuArgArgLeuLeuGluArgTyr
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ArgGlyProGluProSerAspThrValGluMetPheGluGlyGluGlu
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PhePheAlaAlaPheGluArgGlyIleAspValAspAlaAspArgPro
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AspCysValGluGlyArgIleCysPheValPheTyrSerHisLeuLys
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AsnValLysGluValSerPheTyrArgGlyAlaValProValArgVal
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ProGluGluAlaGluAlaAlaArgGlnArgLysGlyAlaAspAlaLeu
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TrpMetAlaThrLeuProIleLysLeuProArgLeuArgGlySerGlu
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GlyProArgArgGlyAlaGlyLeuSerLeuAlaProLeuAsnLeuGly
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AspAlaGluThrGlyPheLeuThrGlnSerAsnLeuLeuSerValAla
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GlyArgLeuGlyLeuAspTrpProAlaValAlaLeuHisLeuGlyVal
195200205
SerTyrArgGluValGlnArgIleArgHisGluPheArgAspAspLeu
210215220
AspGluGlnIleArgHisMetLeuPheSerTrpAlaGluArgGlnAla
225230235240
GlyGlnProGlyAlaValGlyLeuLeuValGlnAlaLeuGluGlnSer
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AspArgGlnAspValAlaGluGluValArgAlaValLeuGluLeuGly
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ArgArgLysTyrGlnAspSerIleArgArgMetGlyLeuAlaProLys
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<210>2
<211>921
<212>DNA
<213>Artificial
<220>
<223>人的PIDDΔ基因序列
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tgggagcggctgcggctgcaccgtgtgaacctcatcgctctgcagcggcgccgggaccct120
gagcaggtcctgctgcagtgcctgccccgaaacaaggtggacgccacccttcggcggctg180
ctggagcggtaccggggccccgagccctctgacacggtggagatgttcgagggcgaagag240
ttctttgcggccttcgagcgcggcatcgacgtggatgctgaccgccctgactgtgtggag300
ggcagaatctgctttgtcttctactcgcacctgaagaatgtgaaggaggtgtccttctac360
cgtggcgcggtgcctgtgcgggtgcccgaggaggctgaggctgcccggcagaggaagggc420
gcagacgccctgtggatggccactctgcccatcaagctgccgagacttcgagggtccgag480
gggccacggcggggggctggcctctccttggcacccttgaatctgggagatgccgagacc540
ggctttctgacgcagagcaacctgctgagtgtggctgggcgtctgggtctggactggcca600
gccgtggccctgcacctgggggtgtcctaccgggaggtgcagcgcatccggcacgagttc660
cgggatgatctggatgagcagatccgtcacatgctcttctcctgggctgagcgccaggct720
gggcagccaggggctgtggggctcctggtgcaggccctggagcagagtgaccggcaggac780
gtggctgaagaggtgcgcgcagtcttggagctcggccgccgcaagtaccaggacagcatc840
cgacgcatgggcttggcccccaaggaccccgctctgcctggctcctcggctccacagccc900
ccagagcctgcccaggcctag921
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<211>26
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<213>Artificial
<220>
<223>上游引物P1序列
<400>3
gcgaattcctggcccatctggcccac26
<210>4
<211>28
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<223>下游引物P2序列
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gaagatctctagaagtggggcacctggc28
Claims (5)
1.抗肿瘤小分子多肽PIDDΔ,其氨基酸序列如SEQIDNO.1所示。
2.权利要求1所述的抗肿瘤小分子多肽PIDDΔ的编码基因,其DNA序列如SEQIDNO.2所示。
3.含有权利要求2所述的抗肿瘤小分子多肽PIDDΔ的编码基因的载体。
4.根据权利要求3所述的载体,其特征在于:将抗肿瘤小分子多肽PIDDΔ的编码基因克隆到pCMV-HA真核表达载体构建而成。
5.权利要求1所述小分子多肽PIDDΔ在制备抗肺癌药物中的应用。
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Citations (1)
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WO2003057892A2 (en) * | 2002-01-14 | 2003-07-17 | Vereniging Voor Christelijk Wetenschappelijk Onderwijs | Viruses with enhanced lytic potency |
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WO2003057892A2 (en) * | 2002-01-14 | 2003-07-17 | Vereniging Voor Christelijk Wetenschappelijk Onderwijs | Viruses with enhanced lytic potency |
Non-Patent Citations (5)
Title |
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LIN ET AL.: "Pidd, a new death-domain–containing protein, is induced by p53 and promotes apoptosis.", 《NATURE GENETICS》 * |
NICOLE BAPTISTE-OKOH ET AL.: "A role for caspase 2 and PIDD in the process of p53-mediated apoptosis.", 《PNAS》 * |
YUNPING LIN ET AL.: "Pidd, a new death-domain–containing protein, is induced by p53 and promotes apoptosis.", 《NATURE GENETICS》 * |
无: "p53-induced death domain-containing protein 1 isoform X2 [Homo sapiens]", 《NCBI REFERENCE SEQUENCE: XP_011518511.1》 * |
无: "UniProtKB-Q9HB75(PIDD1_HUMAN)", 《EMBL-EBI》 * |
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