CN115369118A - Helz2基因在肿瘤防治药物中的应用 - Google Patents
Helz2基因在肿瘤防治药物中的应用 Download PDFInfo
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- CN115369118A CN115369118A CN202210725149.0A CN202210725149A CN115369118A CN 115369118 A CN115369118 A CN 115369118A CN 202210725149 A CN202210725149 A CN 202210725149A CN 115369118 A CN115369118 A CN 115369118A
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Abstract
本发明涉及基因治疗药物制备技术,具体是关于Helz2基因在肿瘤防治药物中的应用。本发明的Helz2基因敲除小鼠模型的构建方法,是通过CRISPR/Cas9技术在小鼠受精卵上进行Helz2基因敲除,再通过显微注射和配繁,获得Helz2全身性基因敲除的纯合小鼠模型。本发明构建了Helz2全身性基因敲除的纯合小鼠模型和发明了靶向Helz2基因治疗肿瘤的新疗法。本发明可为阐明Helz2在肿瘤发生发展中的作用机制提供可靠的动物模型,也为临床上针对Helz2基因在治疗和/或预防肿瘤的药物筛选和制备中提供靶点,并且提供了治疗肿瘤的新疗法。
Description
技术领域
本发明涉及基因治疗药物制备技术,具体是关于Helz2基因在肿瘤防治药物中的应用。
背景技术
Helz2(Helicase with zinc finger 2)[OMIM 611265],又称PRIC285或PDIP1,是一种2649个氨基酸的核解酶蛋白,也是过氧化物酶体增殖物激活受体α相互作用复合体(Peroxisome proliferator activated receptorαinteracting complex,PRIC)的一部分。Helz2由两个ATP结合序列、一个RNaseB结构域和双DNA/RNA解旋酶序列组成,其参与了多种与基因调控相关的机制,包括基因转录、mRNA加工和DNA修复。它可作为PPARα和PPARγ以及其他核受体(RXRA、THRA、THRB)的核转录共激活因子。
Helz2还参与细胞脂质、糖类代谢和肝脏代谢过程,与脂肪细胞分化和原发性胆汁性肝硬化密切相关。Helz2在人和小鼠非酒精性脂肪性肝病(Nonalcoholic fatty liverdisease,NAFLD)中的表达上调,其缺失激活了肝脏长型功能性瘦素受体(Functionalleptin receptor long form,Leprb)的表达,并抑制了肥胖小鼠的NAFLD发展和体重增加。据报道,Helz2的结合体PPARγ可以调节小鼠炎症基因如Ccl3、Ccl7、Cxcl10和Tgtp的表达。PPARγ在先天免疫反应中也发挥了重要作用并与免疫相关疾病有关,例如HCV/HIV感染、骨关节炎、痤疮。就其本身而言,Helz2能结合对免疫反应具有重要作用蛋白的能力,例如BCL6和ISG15。另外,Helz2被发现在哺乳动物中具有抗病毒功能,该基因被鉴定为是具有抗病毒免疫保守成分的干扰素刺激基因(Interferon stimulated gene,ISG)。此外,还发现了Helz2在IFN抗病毒反应中的介导作用,具体涉及Helz2转录和细胞核蛋白的上调,以及转录程序的激活。
然而,利用Helz2基因敲除小鼠模型在抗肿瘤方面的研究及应用未见报道。为了进一步阐明Helz2表达水平下降对肿瘤发生发展的影响,需要构建Helz2基因敲除小鼠,并对其进行肿瘤建模,为探究Helz2影响肿瘤细胞生长机制,抑制肿瘤发生发展的作用以及治疗和/或预防肿瘤的新方法提供动物模型。
CRISPR/Cas9基因组编辑系统是细菌适应性免疫系统的一部分,用于抵御来自噬菌体和质粒的侵入性核酸。CRISPR/Cas9基因编辑工具不仅功能强大,而且具有特异性强、效率高等特点,可以准确、快速地进行基因编辑。虽然有研究报道在细胞水平利用这一技术干扰Helz2基因表达的研究。但是未有利用CRISPR/Cas9系统获得纯合子Helz2基因敲除小鼠模型与相应的研究应用。也未有靶向Helz2基因或其表达的产物在肿瘤治疗当中的研究及应用。
基因靶向治疗正在成为一种重要的肿瘤治疗方法。RNA干扰(RNA interference,RNAi)是在转录后水平抑制特定基因表达的最强大的靶向疗法之一。人工合成RNAi主要有两种类型:siRNA和shRNA。之前研究已经证明了siRNA具有以下局限性:细胞对其摄取能力不足、稳定性差、在体内外易于被降解和在临床实验中递送效率低。然而,病毒载体介导的shRNA具有长效而稳定的基因沉默能力。shRNA的慢病毒载体是一类重组逆转录病毒载体,该载体能在哺乳动物各类细胞中稳定表达shRNA。这类载体已在相关肿瘤动物模型的临床数据库中得到验证。因此,慢病毒介导的shRNA策略是一种具有吸引力的肿瘤治疗候选疗法。
发明内容
本发明所要解决的技术问题是,提供一种构建靶向Helz2基因敲除动物模型的方法,以及靶向干扰Helz2基因在肿瘤药物的制备或筛选和在肿瘤防治药物中的应用。
本发明的第一个方面,为一种Helz2基因敲除小鼠模型的构建方法,其通过CRISPR/Cas9技术在小鼠受精卵上进行Helz2基因敲除,再通过显微注射和配繁,获得Helz2全身性基因敲除的纯合小鼠模型(Helz2-Cas9-KO)。为探究Helz2基因与肿瘤之间的机理研究提供了理想的动物模型,也为Helz2-Cas9-KO小鼠模型在制备或筛选治疗和/或预防肿瘤药物中的应用提供了支撑。
进一步的,所述Helz2基因敲除小鼠模型的构建方法包括如下步骤:
步骤一,靶向小鼠Helz2基因的sgRNA识别序列设计和构建sgRNA;通过对Helz2基因进行分析,确定具体的敲除区域后,根据靶基因设计一对相应的gRNA序列,并合成sgRNA序列;sgRNA序列包括,
SEQ ID No.1:5’-GCCCCAGAGTTACCAGATGGAGG-3’;
SEQ ID No.2:5’-CCTACACCCGACAGAGGTGTAGG-3’;
SEQ ID No.3:5’-AGCAGTGACAGTCTTATGGGTGG-3’;
SEQ ID No.4:5’-GGCATACAGAGGATTGCCACAGG-3’。
将合成的sgRNA序列在体外转录成mRNA;
步骤二,将步骤一中获得的mRNA与Cas9质粒一并通过显微注射的方式注射入小鼠受精卵中,培育后获得F0代小鼠。
步骤三,通过PCR和测序鉴定筛选出阳性F0代小鼠;
步骤四,F0代小鼠性成熟配繁,获得阳性F1代小鼠。
本发明的第二个方面,为上述方法获得的Helz2全身性基因敲除的纯合小鼠模型在制备或筛选抗肿瘤和/或预防肿瘤药物中的应用。所述应用包括药物靶标的筛选、药物的筛选、药物的药效学评价和药物的安全性评价。
本发明的第三个方面,为一种用于构建Helz2基因敲除动物模型的sgRNA序列,其包括下述SEQ ID No.1-SEQ ID No.4基因序列中的一种或多种,
SEQ ID No.1:5’-GCCCCAGAGTTACCAGATGGAGG-3’;
SEQ ID No.2:5’-CCTACACCCGACAGAGGTGTAGG-3’;
SEQ ID No.3:5’-AGCAGTGACAGTCTTATGGGTGG-3’;
SEQ ID No.4:5’-GGCATACAGAGGATTGCCACAGG-3’。
本发明的第四个方面,为一种含有靶向Helz2基因的载体,其靶向干扰Helz2基因的靶点序列为下述基因序列中的一种或多种,
SEQ ID No.5:5’-GCTATCAAGTCTGTCACTACT-3’;
SEQ ID No.6:5’-GCACGATGCTGTATGGCTTTG-3’;
SEQ ID No.7:5’-GGGCCTCATTGACACTCAAAG-3’。
所述载体为慢病毒载体复合物、腺病毒、腺相关病毒、N-乙酰半乳糖胺(GalNAc)、脂质体(LNPs)、聚合物(Polymers)、溶瘤病毒之一,或其它生物学上可接受的基因载体。
本发明的第五个方面,为上述含有靶向Helz2基因的载体在制备抑制Helz2基因表达的生物制剂中的应用。
本发明的第六个方面,为一种治疗和/或预防肿瘤药物,其含有靶向Helz2基因或其表达的产物。
本发明的有益效果:
本发明提供了一种潜在治疗和/或预防肿瘤的关键靶点Helz2,借助于CRISPR/Cas9基因技术和shRNA干扰技术分别构建了Helz2-Cas9-KO小鼠模型和发明了靶向Helz2基因治疗肿瘤的新疗法。通过Helz2-Cas9-KO小鼠体内荷瘤实验和野生型小鼠荷瘤后经shRNA干扰介导的靶向Helz2基因治疗证实了敲除Helz2基因能够显著抑制肿瘤细胞的生长,并延长了小鼠的生存期。
本发明可为阐明Helz2基因在肿瘤发生发展中的作用机制提供可靠的动物模型,也为临床上针对Helz2基因在治疗和/或预防肿瘤的药物筛选和制备中提供靶点,并且还提供了靶向Helz2基因治疗肿瘤的新疗法,应用前景广泛。
附图说明
图1为Helz2-Cas9-KO小鼠策略设计图。
图2为电泳结果图。其中:B6为阴性对照,是B6基因组DNA;N为空白对照,无模板的对照;TRANS 2K PLUS II条带:8000bp、5000bp、3000bp、2000bp、1000bp、750bp、500bp、250bp、100bp。
图3为实施例1中间皮瘤AE17荷瘤Helz2-Cas9-KO小鼠生存曲线。
图4为实施例2中间皮瘤40L荷瘤Helz2-Cas9-KO小鼠生存曲线。
图5为实施例3中卵巢癌ID8荷瘤Helz2-Cas9-KO小鼠生存曲线。
图6为实施例4中肺癌Lewis荷瘤Helz2-Cas9-KO小鼠生存曲线和肿瘤生长情况。
图7为实施例5中乳腺癌E0771荷瘤Helz2-Cas9-KO小鼠生存曲线。
图8为实施例7中sh-NC-AE17和sh-Helz2-AE17细胞荷瘤野生型小鼠生存曲线。
图9为实施例8中sh-Helz2治疗AE17荷瘤野生型小鼠模式图。
图10为实施例8中sh-Helz2治疗AE17荷瘤野生型小鼠生存曲线。
图11为实施例9中Helz2在泛癌中的表达情况。
具体实施方式
下面结合附图和具体实施例对本发明进行进一步描述,但本发明的保护范围并不仅限于此。
图1和图2显示了本发明实施例中Helz2-Cas9-KO小鼠策略设计图和电泳鉴定结果图。
实施例1:间皮瘤细胞株AE17细胞小鼠模型建立
首先,将8~10周龄小鼠分为两组,分别为野生型小鼠(wild-type)组和Helz2敲基因小鼠(knockout)组。然后,将处于对数生长期的间皮瘤细胞株AE17细胞经胰酶消化后,PBS洗涤1次,调整活细胞浓度为每100μl体积中含1×105个细胞。最后,取100μl AE17细胞悬液分别接种于野生型小鼠(wild-type)和Helz2敲基因小鼠(knockout)腹腔中。每天观察小鼠情况。
结果显示:野生型小鼠荷瘤后于第50天开始死亡,至第127天全部死亡;Helz2敲基因小鼠荷瘤后一直均无明显腹水和异常以及死亡,观察截止于第174天。以上结果表明Helz2敲基因小鼠较野生型小鼠荷瘤后能够显著延长小鼠生存期(P<0.001),提示Helz2敲基因小鼠具有显著的抗间皮瘤AE17能力,见图3。
实施例2:间皮瘤细胞株40L细胞小鼠模型建立
首先,将8~10周龄小鼠分为两组,分别为野生型小鼠(wild-type)组和Helz2敲基因小鼠(knockout)组。然后,将处于对数生长期的间皮瘤细胞株40L细胞经胰酶消化后,PBS洗涤1次,调整活细胞浓度为每100μl体积中含2×105个细胞。最后,取100μl 40L细胞悬液分别接种于野生型小鼠(wild-type)和Helz2敲基因小鼠(knockout)腹腔中。每天观察小鼠情况。
结果显示:野生型小鼠荷瘤后于第43天开始死亡,至第66天全部死亡;Helz2敲基因小鼠荷瘤后一直均无明显腹水和异常以及死亡,观察截止于第166天。以上结果表明Helz2敲基因小鼠较野生型小鼠荷瘤后能够明显延长小鼠生存期(P<0.001),提示Helz2敲基因小鼠具有显著的抗间皮瘤40L能力,见图4。
实施例3:卵巢癌细胞株ID8细胞小鼠模型建立
首先,将8~10周龄小鼠分为两组,分别为野生型小鼠(wild-type)组和Helz2敲基因小鼠(knockout)组。然后,将处于对数生长期的卵巢癌细胞株ID8细胞经胰酶消化后,PBS洗涤1次,调整活细胞浓度为每100μl体积中含1×106个细胞。最后,取100μl ID8细胞悬液分别接种于野生型小鼠(wild-type)和Helz2敲基因小鼠(knockout)腹腔中。每天观察小鼠情况。
结果显示:野生型小鼠荷瘤后于第50天开始死亡,至第66天全部死亡;Helz2敲基因小鼠荷瘤后第65天开始死亡,最后死亡的Helz2敲基因小鼠于第86天死亡,还剩一只Helz2敲基因小鼠一直均无明显腹水和异常以及死亡,观察截止于第156天。以上结果表明Helz2敲基因小鼠较野生型小鼠荷瘤后能够明显延长小鼠生存期(P=0.006),提示Helz2敲基因小鼠具有显著的抗卵巢癌ID8能力,见图5。
实施例4:肺癌细胞株Lewis细胞小鼠模型建立
首先,将8~10周龄小鼠分为两组,分别为野生型小鼠(wild-type)组和Helz2敲基因小鼠(knockout)组。然后,将处于对数生长期的肺癌细胞株Lewis细胞经胰酶消化后,PBS洗涤1次,调整活细胞浓度为每100μl体积中含2×106个细胞。最后,取100μl Lewis细胞悬液分别接种于野生型小鼠(wild-type)和Helz2敲基因小鼠(knockout)右肩胛皮下处。每天观察小鼠情况。
结果显示:野生型小鼠荷瘤后于第26天开始死亡,至第34天全部死亡;Helz2敲基因小鼠荷瘤后第31天开始死亡,至第68天全部死亡。以上结果表明Helz2敲基因小鼠较野生型小鼠荷瘤后能够明显延长小鼠生存期(P=0.021),有效抑制肿瘤生长,提示Helz2敲基因小鼠具有显著的抗卵巢癌抗肺癌Lewis能力,见图6。
实施例5:乳腺癌细胞株E0771细胞小鼠模型建立
首先,将8~10周龄小鼠分为两组,分别为野生型小鼠(wild-type)组和Helz2敲基因小鼠(knockout)组。然后,将处于对数生长期的乳腺癌细胞株E0771细胞经胰酶消化后,PBS洗涤1次,调整活细胞浓度为每100μl体积中含8×104个细胞。最后,取100μl E0771细胞悬液分别接种于野生型小鼠(wild-type)和Helz2敲基因小鼠(knockout)腹腔中。每天观察小鼠情况。
结果显示:野生型小鼠荷瘤后于第26天开始死亡,至第33天全部死亡;Helz2敲基因小鼠荷瘤后一直均无明显腹水和异常以及死亡,观察截止于第90天。以上结果表明Helz2敲基因小鼠较野生型小鼠荷瘤后能够明显延长小鼠生存期(P=0.001),提示Helz2敲基因小鼠具有显著的抗乳腺癌E0771能力,见图7。
实施例6:慢病毒感染构建稳定敲减Helz2基因的间皮瘤细胞株AE17细胞(sh-Helz2-AE17)
将对数生长期的AE17细胞按每孔2000个细胞接种于96孔中,待细胞密度为40%-60%时进行sh-Helz2感染AE17细胞,每组3个复孔,以sh-NC作为对照组(sh-NC-AE17);将滴度为108的慢病毒原液稀释为三个梯度:原液、10倍稀释、100倍稀释;将三个不同浓度的病毒液体,各取10μl至每组的3个复孔中,每孔加入1:1000的polybrene(终浓度为5μg/ml),十字混匀,将细胞放回细胞培养箱孵育;24小时后更换为新鲜培养基;感染72-96小时后,观察荧光的表达情况,通过预实验确定感染细胞的最佳稀释倍数,实验发现AE17细胞感染的最佳浓度为原液,因此采用原液浓度进行正式感染;在感染前进行72小时最低杀死细胞量的嘌呤霉素预实验,提前在24孔板培养AE17细胞至对数生长期,加入不同浓度的嘌呤霉素(1μg/ml、2μg/ml、3μg/ml、4μg/ml、5μg/ml、6μg/ml、7μg/ml、8μg/ml、9μg/ml、10μg/ml),72小时后挑选最低杀死细胞浓度;实验挑选的最低杀死细胞浓度是3μg/ml;AE17细胞感染后连续培养一周,期间将AE17细胞从96孔板消化转移至6孔板,进行嘌呤霉素筛选,筛选培养1个月,即可获得稳定敲减Helz2基因的AE17(sh-Helz2-AE17细胞)。
实施例7:构建慢病毒感染的AE17细胞(sh-NC-AE17细胞和sh-Helz2-AE17细胞)荷瘤野生型小鼠模型
首先,将8~10周龄野生型小鼠分为两组,分别为sh-NC-AE17组和sh-Helz2-AE17组。然后,将处于对数生长期的sh-NC-AE17细胞和sh-Helz2-AE17细胞经胰酶消化后,PBS洗涤1次,调整活细胞浓度为每100μl体积中含3×105个细胞。最后,取100μl的sh-NC-AE17细胞和sh-Helz2-AE17细胞液分别接种于野生型小鼠腹腔中。每天观察小鼠情况。
结果显示:sh-NC-AE17组小鼠荷瘤后于第35天开始死亡,至第48天全部死亡;sh-Helz2-AE17组小鼠荷瘤后于第63天死亡一只小鼠,剩余小鼠无明显腹水和异常,观察截止于第182天。以上结果发现与sh-NC-AE17组相比,sh-Helz2-AE17组小鼠能够显著延长荷瘤小鼠的生存期(P=0.025),提示经过慢病毒sh-Helz2感染后的AE17细胞体内成瘤能力显著减弱,见图8。
实施例8:shRNA干扰介导的靶向Helz2基因治疗AE17荷瘤野生型小鼠模型
首先,将8~10周龄小鼠分为四组,分别为sh-NC对照组和sh-Helz2-1、sh-Helz2-2、sh-Helz2-3治疗组。然后,将处于对数生长期的间皮瘤细胞株AE17细胞经胰酶消化后,PBS洗涤1次,调整活细胞浓度为每100μl体积中含1×105个细胞。最后,取100μl AE17细胞悬液分别接种于野生型小鼠腹腔中。
将10μl的滴度为108慢病毒原液sh-NC和sh-Helz2分别加入到90μl的无菌PBS中稀释,即获得100μl的慢病毒使用液。于接种肿瘤细胞第12小时,使用慢病毒使用液sh-NC和sh-Helz2分别注射到荷瘤野生型小鼠腹腔中,注射体积为上述稀释后100μl的慢病毒使用液。此为第1次使用慢病毒sh-Helz2治疗。于第1次治疗间隔3天,按第1次方式重复再次治疗。此为第2次使用慢病毒sh-Helz2治疗。于第2次治疗间隔3天,按第1次方式重复再次治疗。此为第3次使用慢病毒sh-Helz2治疗。于第3次治疗间隔3天,按第1次方式重复再次治疗。此为第4次使用慢病毒sh-Helz2治疗。于第4次治疗间隔7天,按第1次方式重复再次治疗。此为第5次使用慢病毒sh-Helz2治疗。于第5次治疗间隔7天,按第1次方式重复再次治疗。此为第6次使用慢病毒sh-Helz2治疗。治疗间隔时间如图9所示,一共治疗6次。
结果显示:sh-NC对照组荷瘤小鼠于第51天开始死亡,至第63天全部死亡;sh-Helz2-1治疗组荷瘤小鼠于第52天开始死亡,至第92天全部死亡(P=0.197);sh-Helz2-2治疗组荷瘤小鼠于第74天开始死亡,剩余一只小鼠无明显腹水和异常,观察截止于第113天(P=0.025);sh-Helz2-3治疗组荷瘤小鼠于第63天开始死亡,剩余两只小鼠无明显腹水和异常,观察截止于第113天(P=0.063)。以上结果表明与sh-NC对照组相比,sh-Helz2治疗组能够显著延长荷瘤小鼠的生存期,提示针对Helz2基因为靶点开发的慢病毒运载的shRNA(sh-Helz2)能够有效的治疗荷瘤小鼠,提升生存时间和生存质量,见图10。
实施例9:为了探究Helz2基因在其它类型肿瘤中的表达情况,利用数据库TCGA和GTEx共分析了15776例样本,结果发现,膀胱尿路上皮癌(BLCA)、乳腺浸润癌(BRCA)、宫颈鳞癌和腺癌(CESC)、胆管癌(CHOL)、结肠癌(COAD)、食管癌(ESCA)、多形成性胶质细胞瘤(GBM)、头颈鳞状细胞癌(HNSC)、肾透明细胞癌(KIRC)、肾乳头状细胞癌(KIRP)、急性髓细胞样白血病(LAML)、脑低级别胶质瘤(LGG)、肝细胞肝癌(LIHC)、肺腺癌(LUAD)、卵巢浆液性囊腺癌(OV)、胰腺癌(PAAD)、嗜铬细胞瘤和副神经节瘤(PCPG)、前列腺癌(PRAD)、直肠腺癌(READ)、肉瘤(SARC)、皮肤黑色素瘤(SKCM)、胃癌(STAD)、睾丸癌(TGCT)、甲状腺癌(THCA)和子宫内膜癌(UCEC)共25类肿瘤中均高表达Helz2(*P<0.05;**P<0.01;***P<0.001),见图11,提示在这些肿瘤中,针对Helz2基因靶点进行干扰也具有同实施例8一样具有治疗肿瘤的作用。
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Claims (9)
1.一种Helz2基因敲除小鼠模型的构建方法,其特征是:通过CRISPR/Cas9技术在小鼠受精卵上进行Helz2基因敲除,再通过显微注射和配繁获得Helz2全身性基因敲除的小鼠模型。
2.根据权利要求1所述的Helz2基因敲除小鼠模型的构建方法,其特征是:用于敲除小鼠Helz2基因的sgRNA序列包括下述SEQ ID No.1-SEQ ID No.4基因序列中的一种或多种,
SEQ ID No.1:5-GCCCCAGAGTTACCAGATGGAGG-3’;
SEQ ID No.2:5’-CCTACACCCGACAGAGGTGTAGG-3’;
SEQ ID No.3:5’-AGCAGTGACAGTCTTATGGGTGG-3’;
SEQ ID No.4:5’-GGCATACAGAGGATTGCCACAGG-3’。
3.一种权利要求1所述Helz2全身性基因敲除的纯合小鼠模型在在制备或筛选抗肿瘤和/或预防肿瘤药物中的应用。
4.根据权利要求3所述的应用,其特征是:所述应用包括药物靶标的筛选、药物的筛选、药物的药效学评价和药物的安全性评价。
5.一种用于构建Helz2基因敲除动物模型的sgRNA序列,其特征是:包括下述SEQ IDNo.1-SEQ ID No.4基因序列中的一种或多种,
SEQ ID No.1:5’-GCCCCAGAGTTACCAGATGGAGG-3’;
SEQ ID No.2:5’-CCTACACCCGACAGAGGTGTAGG-3’;
SEQ ID No.3:5’-AGCAGTGACAGTCTTATGGGTGG-3’;
SEQ ID No.4:5’-GGCATACAGAGGATTGCCACAGG-3’。
6.一种含有靶向Helz2基因的载体,其特征是:其靶向干扰Helz2基因的靶点序列为下述基因序列中的一种或多种,
SEQ ID No.5:5’-GCTATCAAGTCTGTCACTACT-3’;
SEQ ID No.6:5’-GCACGATGCTGTATGGCTTTG-3’;
SEQ ID No.7:5’-GGGCCTCATTGACACTCAAAG-3’。
7.根据权利要求6所述的含有靶向Helz2基因的载体,其特征是:所述载体为慢病毒载体复合物、腺病毒、腺相关病毒、N-乙酰半乳糖胺、脂质体、聚合物、溶瘤病毒之一,或其他生物学上可接受的基因载体。
8.一种权利要求6所述的含有靶向Helz2基因的载体在制备抑制Helz2基因表达的生物制剂中的应用。
9.一种治疗和/或预防肿瘤药物,其特征在于:其含有靶向干扰Helz2基因或其表达的产物。
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