CN111607648A - 一种非小细胞肺癌诊断试剂盒 - Google Patents

一种非小细胞肺癌诊断试剂盒 Download PDF

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CN111607648A
CN111607648A CN202010274247.8A CN202010274247A CN111607648A CN 111607648 A CN111607648 A CN 111607648A CN 202010274247 A CN202010274247 A CN 202010274247A CN 111607648 A CN111607648 A CN 111607648A
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马志红
陈莹蓉
李栋立
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Huzhou Central Hospital
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Abstract

本发明涉及一种诊断试剂盒,尤其是一种非小细胞肺癌诊断试剂盒;属于诊断试剂盒技术领域。一种非小细胞肺癌诊断试剂盒,试剂盒含有miR‑4286的实时荧光定量PCR引物,所述引物分别为:SEQ ID NO:1上游引物序列:5'‑GCGTCACCCCACTCCT‑3';SEQ ID NO:2通用下游引物序列:5'‑CGCTCACCCCACTCCT‑3'。本发明提供的试剂盒通过检测miR‑4286的表达,可以对非小细胞肺癌发生进行早期诊断,通过检测其表达水平与临床分期以及转移的关系,对病人预后作出评价。

Description

一种非小细胞肺癌诊断试剂盒
技术领域
本发明涉及一种诊断试剂盒,尤其是一种非小细胞肺癌诊断试剂盒;属于诊断试剂盒技术领域。
背景技术
公开号为CN102121047A的中国发明专利,公开了一种中期因子表达量的实时荧光定量RT-PCR检测试剂盒。该试剂盒是基于对中期因子(MK)的研究,而发展起来的一种诊断手段。多项有关 MK 功能的研究证实其参与肿瘤的生长、分化及肿瘤血管生成等过程,表明MK 在肿瘤演化过程中可能具有直接作用。由于 MK 特异表达于多种肿瘤组织,因而 MK 成为肿瘤治疗的新靶点。
然而,MK因子与多种肿瘤都相关,仅通过该试剂盒不能很好地对肿瘤进行分型。而非小细胞肺癌(non-small cell lung cancer, NSCLC)是我国最常见的恶性肿瘤之一,其发病率和死亡率位于世界之首,侵袭、转移是其致死的主要原因,但其转移的机制一直未能阐明。微小RNA (microRNAs, miRNAs)被认为通过作用于癌基因和抑癌基因的转录后调控在NSCLC 的发生、转移中起着重要的作用。
miR-4286是一个在人胚胎干细胞早期分化进程中筛选出的新发现的miRNA,在黑色素瘤、食管癌及直肠癌的治疗中可观察到miR-4286表达的上调或显著改变。但目前,仍未有基于该发现的非小细胞肺癌诊断试剂盒的报导。
发明内容
本发明要解决上述技术问题,从而提供一种非小细胞肺癌诊断试剂盒。
本发明解决上述问题的技术方案如下:
一种非小细胞肺癌诊断试剂盒,试剂盒含有miR-4286 的实时荧光定量PCR 引物,所述引物分别为:
SEQ ID NO :1上游引物序列:5'-GCGTCACCCCACTCCT-3';
SEQ ID NO :2通用下游引物序列:5'-CGCTCACCCCACTCCT-3'。
作为优选,所述试剂盒还包括PCR 反应常用的酶和试剂;所述试剂包括:组织总RNA 提取试剂、RNA 加polyA 试剂、逆转录试剂和定量PCR 试剂;
其中,逆转录试剂包括miR-4286 的特异逆转录引物,其序列为:
SEQ ID NO :3引物序列:
5'-GTCGTATCCAGTGCAGGGTCCGAGGTATTCGCACTGGATACGACGGTACC-3';
逆转录试剂还包括内参U6的逆转录引物,其序列为:
SEQ ID NO :4引物:5'-CTCAACTGGTGTCGTGGA-3';
定量PCR 试剂中还包括miR-4286相关的内参U6 的特异引物,其序列为:
SEQ ID NO :5上游引物:
5'-ACACTCCAGCTGGGTGAGATGAAGCACTGTAG-3';
SEQ ID NO :4通用下游引物:
5'-CTCAACTGGTGTCGTGGA-3'。
我们的研究中采用miRNA 芯片技术筛选NSCLC组织中特异性表达的miRNA,通过聚类分析发现,miR-4286 在发生淋巴结转移的NSCLC 组织中特异性上调表达,此后Real-Time PCR 技术验证证实,NSCLC 癌组织中miR-4286 的上调表达与淋巴结转移密切相关。
进一步的采用原位杂交方法和荧光定量PCR方法分别检测NSCLC组织芯片和新鲜冻存组织中miR-4286的表达,分析其表达水平与NSCLC临床病理特征的关系。
组织芯片中NSCLC癌组织的miR-4286阳性表达率为62.14%,明显高于癌旁配对正常组织的4.29%(P <0.001);癌组织中miR-4286的表达与NSCLC的肿瘤大小、淋巴结转移及TNM分期密切相关(P <0.05),而与患者的性别、年龄、肿瘤组织类型、分化程度均无明显的相关性(P >0.05)。荧光定量PCR方法结果显示,NSCLC癌组织中miR-4286的表达水平为0.032(0.024-0.057),显著高于配对癌旁正常组织的0.027(0.018-0.041)(P <0.05),miR-4286的高表达水平与NSCLC的TNM分期、淋巴结转移相关(P<0.05)。NSCLC 组织中miR-4286的高表达与NSCLC的疾病进展与转移潜能明显相关。
本发明具有以下有益效果:
本发明提供的试剂盒通过检测miR-4286 的表达,可以对非小细胞肺癌发生进行早期诊断,通过检测其表达水平与临床分期以及转移的关系,对病人预后作出评价。提出了miR-4286 在制备抑制非小细胞肺癌肿瘤生长和转移药物中的作用。本发明在医学和生物制药领域有重大实际意义和巨大的应用价值。
附图说明
图1为NSCLC 不同细胞株中miR-4286的表达水平;
图2为组织芯片NSCLC组织中miR-4286的表达情况;
图3为非小细胞肺癌组织中miR-4286的表达。
具体实施方式
以下结合附图对本发明进行进一步的说明。
本具体实施方式仅仅是对本发明的解释,并不是对本发明的限制,本领域技术人员在阅读了本发明的说明书之后所做的任何改变,只要在权利要求书的范围内,都将受到专利法的保护。
现结合实施例和附图,对本发明作详细描述,但本发明的实施不仅限于此。
实施例1
miR-4286 在非小细胞肺癌不同细胞株中的差异性表达
采用Real-Time PCR 方法检测NSCLC 细胞株NCI-H1299(淋巴结转移)、肺鳞癌细胞SK-MES-1,NCI-H520和肺腺癌细胞GLC-82、A549、NCI-H460中miR-4286的表达水平。
结果显示,miR-4286在来源于转移淋巴结细胞株NCI-H1299中的表达水平最高,鳞癌细胞SK-MES-1,NCI-H520次之,在NCI-H460、GLC-82、A549表达水平较低(图1)。
实施例2
采用原位杂交技术检测NSCLC组织芯片(芯片编号:HLugSqu150CS01、HLugA150CS02)中miR-4286的表达量。150例NSCLC患者样本来源于国家人类遗传资源共享服务平台(2005DKA21300),剔除信息不全及脱靶等因素,共入组患者140例,男105例,女35例;年龄35~72岁(60.25±9.22)岁;肿瘤直径≤3cm 102例,>3cm 38例;腺癌72例,鳞癌68例;TNM分期:Ι期59例,II期45例,III期27例,IV期9例;淋巴结转移59例,未转移81例;远处转移9例,未转移131例;肿瘤分化程度:Ι期19例,II期84例,III期37例。
所有患者均经临床确诊且术前未接受放、化疗,手术切除组织包含癌组织和相匹配的距离癌组织边缘5cm以上的远端正常组织。离体组织经常规4%甲醛固定并石蜡包埋,5μm厚度切片,制成直径1.5mm的组织芯片。采用原位杂交方法检测组织芯片中140例NSCLC癌组织及远端正常组织中miR-4286的表达,分析其表达水平与NSCLC临床病理特征的关系。
按照丹麦 Exiqon 公司的原位杂交试剂盒 miRCURY LNA™ microRNA ISHOptimization Kit(FFPE)(No.90008)的操作说明进行实验。组织芯片脱蜡水化后,蛋白酶K(15μg/ml)37℃孵育15min。将梯度乙醇脱水后的芯片置于55℃预杂交30min,接着加入90℃变性的地高辛标记探针miR-4286(丹麦Exiqon公司,YD00610917-BCG,1:500)杂交工作液于55℃孵育过夜。次日经过梯度洗片和封闭后,加入Anti-DIG-AP(美国Roche公司,No.11093274910,1:800)室温孵育1h。最后采用NBT/BCIP染色,核固红复染后封片镜检。用已知的阳性切片作阳性对照,用PBS替代探针作阴性对照。
原位杂交结果显示,miR-4286阳性染色主要定位于NSCLC癌组织的细胞质或细胞核(图2. a-d),远端正常组织中偶有表达(图2 e)。140例NSCLC癌组织中miR-4286高表达率为62.14%(87/140),高于远端正常组织的4.29%(6/140),差异有统计学意义(P<0.01)。进一步分析miR-4286与NSCLC临床病例特征的关系(表1)发现,miR-4286 高表达与NSCLC 肿瘤直径大小、肿瘤TNM分期和淋巴结转移均有关(均P <0.05),而与患者性别、年龄、肿瘤组织类型、远处转移和肿瘤分化程度均无关(均P >0.05)。
表1 miR-4286 与临床病理资料间的联系
Figure 214794DEST_PATH_IMAGE002
实施例3
选择2014 年1 月~2015 年12 月本院接受手术治疗的62 例原发性NSCLC 患者手术切除标本。留取肿瘤组织和距肿瘤边缘5cm 以上的配对远端正常组织,手术离体后30 分钟内液氮速冻,保存于-80℃冰箱备用。所有病例经病理学检查确诊,临床资料完整,术前未接受放化疗。该实验研究经本院伦理委员会批准,所有患者签署知情同意书。
RNA提取和cDNA逆转录
RNA 抽提与逆转录均采用Trizol(Invitrogen,美国) 抽提试剂抽提RNA,为避免基因组DNA 污染,采用PrimeScriptTMⅡ 1st StrandcDNA Synthesis Kit 试剂盒(Takara,大连宝生物)逆转录,获得cDNA 第一链,-80℃ 保存备用。
Real-Time PCR 检测PCR 扩增引物由上海基康生物有限公司设计、合成。
其中,miR-4286 的上游引物:5'-GCGTCACCCCACTCCT-3',如SEQ ID NO :1 所示;
下游引物序列为:5'-CGCTCACCCCACTCCT-3',如SEQ ID NO :2 所示。
特异逆转录引物,其序列为:
5'-GTCGTATCCAGTGCAGGGTCCGAGGTATTCGCACTGGATACGACggtacc-3',如SEQ ID NO :3所示;
内参U6的上游引物:
5'-ACACTCCAGCTGGGTGAGATGAAGCACTGTAG-3',如SEQ ID NO :5 所示;
内参U6的下游引物:5'-CTCAACTGGTGTCGTGGA-3'如SEQ ID NO :4
内参U6的逆转录引物,其序列为:5'-CTCAACTGGTGTCGTGGA-3',如SEQ ID NO :4 所示;
PCR 扩增在ABI7500 PCR 仪上进行。扩增体系为:cDNA 2μL,SYBR Premix Ex TaqTM(2×) 10μL, ROX II 0.4μL, 上下游引物各0.4μL,H2O 6.8μL, 合计20μl 体系。先95℃ 变性10 秒后,40 个循环95℃ 5 秒,60℃ 34 秒, 采集荧光数据,并绘制溶解曲线。以水为模板同批扩增,作阴性对照,每个样品均重复2 次扩增。定量结果采用2-△CT法计算NSCLC癌组织和远端正常组织中miR-4286的相对表达量,采用2-△△CT法 计算NSCLC 患者癌组织中AEG-1 mRNA 的最终相对表达量,其中△CT=CT目的基因-CT内参基因,△△CT=△CT癌组织-△CT正常组织
如图3所示,miR-4286在NSCLC新鲜冻存的癌组织中表达高于配对的远端正常组织,且其高表达水平与NSCLC的淋巴结转移有关(表1)。
因此miR-4286可以用来制备非小细胞肺癌发生诊断试剂盒。参见表1,miR-4286的表达与非小细胞肺癌的淋巴结转移和临床分期密切相关,因此,miR-4286可以用来制备非小细胞肺癌转移诊断试剂盒。
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Claims (2)

1.一种非小细胞肺癌诊断试剂盒,其特征在于:试剂盒含有miR-4286 的实时荧光定量PCR 引物,所述引物分别为:
SEQ ID NO :1上游引物序列:5'-GCGTCACCCCACTCCT-3';
SEQ ID NO :2通用下游引物序列:5'-CGCTCACCCCACTCCT-3'。
2.根据权利要求1所述的一种非小细胞肺癌诊断试剂盒,其特征在于:所述试剂盒还包括PCR 反应常用的酶和试剂;所述试剂包括:组织总RNA 提取试剂、RNA 加polyA 试剂、逆转录试剂和定量PCR 试剂;
其中,逆转录试剂包括miR-4286 的特异逆转录引物,其序列为:
SEQ ID NO :3引物序列:
5'-GTCGTATCCAGTGCAGGGTCCGAGGTATTCGCACTGGATACGACGGTACC-3';
逆转录试剂还包括内参U6的逆转录引物,其序列为:
SEQ ID NO :4引物:5'-CTCAACTGGTGTCGTGGA-3';
定量PCR 试剂中还包括miR-4286相关的内参U6 的特异引物,其序列为:
SEQ ID NO :5上游引物:
5'-ACACTCCAGCTGGGTGAGATGAAGCACTGTAG-3';
SEQ ID NO :4通用下游引物: 5'-CTCAACTGGTGTCGTGGA-3'。
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