CN108148911B - miR-582在制备前列腺癌骨转移的诊断、预后试剂盒及药物中的应用 - Google Patents
miR-582在制备前列腺癌骨转移的诊断、预后试剂盒及药物中的应用 Download PDFInfo
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Abstract
本发明公开了miR‑582在制备前列腺癌骨转移的诊断、预后试剂盒及药物中的应用。发明人意外地发现miR‑582‑3p和miR‑582‑5p在骨转移的前列腺癌组织中低表达,并且miR‑582‑3p或miR‑582‑5p低表达预示着更低的无骨转移生存率;此外,体内体外实验均证实pri‑miR‑583过表达能上调miR‑582‑3p和miR‑582‑5p,并通过TGF‑β信号通路抑制前列腺癌骨转移,及前列腺癌骨转移细胞系的迁移和侵袭。因此,基于上述发现,能将miR‑582应用于制备前列腺癌骨转移诊断、预后试剂盒,并且有望开发出抑制前列腺癌骨转移的药物。
Description
技术领域
本发明属于生物医学领域,更具体地涉及miR-582在制备前列腺癌骨转移的诊断、预后 试剂盒及药物中的应用。
背景技术
在世界范围内,前列腺癌(Prostate Cancer、PCa)是男性最常见的恶性肿瘤之一,也是癌 症死亡的第二大因素,仅次于肺癌。前列腺癌的主要死因是肿瘤发生远处转移,特别是骨转 移,尽管原发性前列腺癌可以通过手术、激素治疗、放疗等手段得到有效控制,但是骨转移 前列腺癌却仍然无法治愈,患者的生存率极低。因此,骨转移的早期诊断对于前列腺癌的预 后及诊疗来说非常关键,同时,针对前列腺癌骨转移的治疗药物的开发对于提高患者生存率 也大有帮助。
近年来,前列腺癌骨转移相关的特异性miRNA的发现为其诊断和治疗打开了新局面, miRNA可以通过与mRNA的3’未翻译区域(3’-UTR)结合,抑制mRNA的翻译或促进mRNA 的降解,从而调节基因的表达。越来越多证据表明,miRNA在肿瘤转移中发挥着重要的作用,对于特定癌种而言,某些miRNA能够抑制肿瘤转移,某些miRNA能够促进肿瘤转移,在恶 性肿瘤中的miRNA的表达谱各异,因此,挖掘和探究新的miRNA在前列腺癌骨转移中的分 子机制,对前列腺癌骨转移的预防和靶向性治疗将提供新的思路。
发明内容
本发明的目的在于提供miR-582在制备前列腺癌骨转移的诊断、预后试剂盒及药物中的 应用。
本发明所采取的技术方案是:
检测miR-582和/或其编码基因的试剂在制备前列腺癌转移诊断试剂盒中的应用。
作为优选的,所述试剂选自引物、探针、芯片中的一种或多种。
作为优选的,所述miR-582选自pri-miR-582、pre-miR-582、miR-582-3p、miR-582-5p及 其片段或变体中的一种或几种。
作为优选的,所述转移包括骨转移、脑转移和淋巴结转移。
检测miR-582和/或其编码基因的试剂在制备前列腺癌预后试剂盒中的应用。
作为优选的,所述miR-582选自pri-miR-582、pre-miR-582、miR-582-3p、miR-582-5p及 其片段或变体中的一种或几种。
作为优选的,所述预后的指标为无转移生存时间/生存率,其中,转移包括骨转移、脑转 移和淋巴结转移。
以下物质中的一种或多种在制备抑制前列腺癌骨转移药物中的应用:1)能上调miR-582 表达量的物质;2)能增强miR-582活性的物质;3)能增长miR-582有效作用时间的物质;4) 能增强miR-582稳定性的物质。
作为优选的,所述能上调miR-582表达量的物质选自:1)miR-582分子;2)miR-582修饰物;3)miR-582模拟物;4)编码miR-582的DNA;5)表达miR-582载体或病毒。
作为优选的,所述miR-582选自pri-miR-582、pre-miR-582、miR-582-3p、miR-582-5p及 其片段或变体中的一种或几种。
本发明的有益效果是:
发明人意外地发现miR-582-3p和miR-582-5p在骨转移的前列腺癌组织中低表达,并且 miR-582-3p或miR-582-5p低表达预示着更低的无骨转移生存率;此外,体内体外实验均证实 pri-miR-583过表达能上调miR-582-3p和miR-582-5p,并通过TGF-β信号通路抑制前列腺癌 骨转移,及前列腺癌骨转移细胞系的迁移和侵袭。因此,基于上述发现,能将miR-582应用 于制备前列腺癌骨转移诊断、预后试剂盒,并且有望开发出抑制前列腺癌骨转移的药物。
附图说明
图1:miR-582-3p和miR-582-5p的表达情况;其中,图A和图B分别为TCGA数据库 中正常组织和前列腺癌组织中miR-582-3p和miR-582-5p的表达情况;图C和图D分别为前 列腺癌骨转移组织和无骨转移组织中miR-582-3p和miR-582-5p的表达情况;图E和图F分 别为miR-582-3p和miR-582-5p的表达量与骨转移状态的病例统计图,图中,组别标记带L 为低表达组,带H为高表达组,nBM表示无骨转移,BM表示骨转移,ANT表示正常组织, Tumor表示肿瘤组织;
图2:前列腺癌细胞系中miR-582-3p和miR-582-5p的相对表达量;
图3:miR-582-3p和miR-582-5p的表达量与前列腺癌的生存分析,其中,图A和图B为前列腺癌无骨转移生存率曲线,图C和图D为前列腺癌总生存率曲线;图中,组别标记带 L为低表达组,带H为高表达组;
图4:转染pri-miR-582过表达载体的三组前列腺癌细胞系中miR-582-3p和miR-582-5p 的表达量,组别标记中,vector表示转染了对照质粒,pri-miR-582表示转染了pri-miR-582过 表达载体;
图5:pri-miR-582过表达在体内抑制前列腺癌骨转移结果;其中,图A为BLI成像示意 图,图B为骨X射线图,图C为骨HE染色图,图D为骨转移评分结果;图E为BLI信号 结果图;图F为总生存曲线,图G为无骨转移生存曲线,组别标记中,vector表示接种了转 染有对照质粒的PC-3细胞,pri-miR-582表示接种了转染有pri-miR-582过表达载体的PC-3 细胞;
图6:miR-582-3p模拟物和miR-582-5p模拟物对三组前列腺癌细胞系的迁移和侵袭的 影响,其中,图A为miR-582-3p模拟物和miR-582-5p模拟物在三组前列腺癌细胞系中对 miR-582-3p或miR-582-5p的表达量;图B和图C分别为miR-582-3p模拟物和 miR-582-5p模拟物对三组前列腺癌细胞系的迁移和侵袭的能力的抑制,组别标记中,vector 表示转染了对照质粒,miR-582-3p表示转染了miR-582-3p模拟物,miR-582-5p表示转染 了miR-582-5p模拟物;
图7:miR-582-3p、miR-582-5p、miR-582对TGF-β转录活性的影响,组别标记中,vector 表示转染了荧光素酶标记的对照质粒,miR-582表示转染了荧光素酶标记的miR-582表达载 体,miR-582-3p表示转染了荧光素酶标记的miR-582-3p表达载体,miR-582-5p表示转染了 荧光素酶标记的miR-582-5p表达载体,TGF-β表示转染了TGF-β/Smad荧光素酶报告质粒;
图8:miR-582-3p和miR-582-5p生物信息学靶向预测结果;
图9:荧光素酶验证miR-582-3p、miR-582-5p、miR-582靶向结果;
图10:TGF-β信号通路解除pri-miR-582抑制的前列腺癌细胞的迁移和侵袭能力,其中, +表示添加有该物质,-表示未添加该物质。
具体实施方式
下面结合实验,进一步阐述本发明,但并不局限于此。下述实验例中所使用的实验方法 或实验条件,如无特殊说明,均按常规方法或厂家说明书进行,下述实验例中所用的材料、 试剂等,如无特殊说明,均可从商业途径得到。
样本来源
实验例所用的细胞系包括人前列腺癌细胞系(22Rv1、PC-3、VCaP、DU145、LNCaP)和正常前列腺上皮细胞RWPE-1,均从中科院上海细胞库获得;人前列腺癌细胞C4-2B购自MD安德森癌症中心;其中,RWPE-1细胞用Defined Keratinocyte-SFM(1X)(Invitrogen公司)培养,PC-3、LNCaP、22Rv1细胞用含有青霉素G(100U/ml)、链霉素(100mg/ml)和 10%胎牛血清(Life Technologies公司)的RPMI-1640培养基(Life Technologies公司)培养,DU145、VCaP细胞用含有10%胎牛血清的DMEM培养基(Invitrogen公司)培养;C4-2B 细胞用含有10%胎牛血清的T培养基(Invitrogen公司)培养,以上细胞均在5%CO2,37℃ 条件下培养。
实验例所用的组织样本由广州市第一人民医院提供,包括157例手术或穿刺活检获得的 前列腺癌组织样本(其中,94例非骨转移前列腺癌组织,63例骨转移前列腺癌组织),以上 组织样本均有对应的临床病理信息。
实验方法
1、RNA提取、逆转录和实时定量PCR
采用RNA提取试剂盒(Qiagen公司)提取待测组织或待测细胞的总RNA,mRNA和miRNA均按照Revert Aid First Strand cDNA Synthesis Kit(Thermo Fisher公司)说明书进行逆 转录,使用iQ SYBR Green(BIO-RAD公司)在CFX96系统上(BIO-RAD公司)对cDNA进行扩增和定量;以U6为内参,选用2-ddCt相对定量法进行荧光定量检测,计算miR-582-3p和miR-582-5p的相对表达量;其中,检测U6、miR-582-3p和miR-582-5p的引物由广州市锐博生物科技有限公司合成与纯化。
2、Western blotting
使用细胞分离试剂盒(Cell Signaling Technology公司)对待测细胞进行核质分离,用RIPA 缓冲液(Cell Signaling Technology公司)提取全细胞裂解物,Westernblotting按常规条件操 作,其中,SMAD2抗体(Cat#3195),、pSMAD3抗体(Cat#4664),、SMAD4抗体(Cat#5741)、 TGFBRI抗体(Cat#4706)、TGFBRII抗体(Cat#3950)购自Cell SignalingTechnology公司, PDLIM7抗体(Cat#:SAB1406807)购自Sigma-Aldrich公司,α-tubulin作为内参,其抗体购自 Sigma-Aldrich公司。
3、质粒及转染
从基因组DNA中扩增人pri-miR-582基因,将其克隆到pMSCV-puro逆转录病毒载体中 (Clontech公司),(CAGAC)12/pGL3TGF-β/Smad荧光素酶报告质粒和对照质粒购自Clontech 公司,用于评价TGF信号通路组分的转录活性,从基因组DNA中扩增SMAD2、SMAD4、TGFBRI、TGFBRII的3’-UTR区域,并克隆到pmirGLO质粒(Promega公司)中,由广州市 锐博生物科技有限公司合成与纯化miR-582-3p模拟物、miR-582-5p模拟物、TGFBRI过表达 质粒、SMAD2过表达质粒及对照载体,转染采用Lipofectamine 3000(Life Technologies公司)。4、荧光素酶检测
将4×104个细胞接种到24孔板培养24小时,按常规方法进行荧光素酶检测,待测细胞 分别用250ng(CAGAC)12/pGL3TGF-β/Smad荧光素酶报告质粒、或pmirGLO-SMAD2-3′UTR 荧光素酶质粒、或pmirGLO-SMAD4-3′UTR荧光素酶质粒、或pmirGLO-TGFBRI-3′UTR荧光素酶质粒、或pmirGLO–TGFBRII-3′UTR荧光素酶质粒转染,转染时同时加入5ng pRL-TK 载体质粒(Promega公司),转染试剂为Lipofectamine 3000(Invitrogen),转染36小时后检测荧光信号。
5、侵袭和迁移实验
采用transwell小室法进行侵袭和迁移实验,简而言之,transwell小室涂布或不涂布基质 胶(BD Biosciences),将细胞用胰蛋白酶消化,并悬浮在无血清培养基中,上室添加1.5×105个细胞,下室为含有10%胎牛血清的培养基,孵育24~48h后,用4%多聚甲醛固定,并用 苏木精染色,在显微镜下计数(100×)。
6、动物实验
5-6周龄,18~20g的BALB/c-nu裸鼠用于实验,实验前进行麻醉,左心室接种1×105个(100μL PBS)PC-3细胞。用生物发光成像系统(BLI)监测骨转移进展,X射线监测溶骨性病变的透射性损伤,用Metamorph图像分析系统和软件测量溶骨性病变的面积,每只动物的骨破坏程度表示为平方毫米,根据以下标准对骨转移进行评分:0:无转移;1:骨损伤覆盖骨宽度小于1/4;2:骨损伤覆盖骨宽度1/4~1/2;3:骨损伤覆盖骨宽度1/2~3/4;4:骨损伤覆盖骨宽度大于3/4;每只动物的骨转移评分来自四肢评分综合,每天监测动物的体征,当 出现体重减轻10%、瘫痪、头歪斜等痛苦症状时选择安乐死。
实验例1、miR-582-3p和miR-582-5p在骨转移前列腺癌组织中低表达
前期通过TCGA数据库分析前列腺癌患者中miRNA序列情况,结果如图1所示,相比于正常组织,前列腺癌组织中miR-582-3p和miR-582-5p高表达(均P<0.05,参考图1A和 图1B)。
进一步研究却意外地发现,在149例前列腺癌组织中,相对于94例无骨转移前列腺癌组 织,63例骨转移前列腺癌组织中miR-582-3p和miR-582-5p显著表达下调(如图1C和图1D 所示),约为无骨转移前列腺癌组织的0.5~0.6倍。
按前列腺癌组织中miR-582-3p和miR-582-5p表达量的中位值对miR-582-3p和miR-582-5p分层为高表达量(H)和低表达量(L),统计无骨转移和骨转移的前列腺癌组织中miR-582-3p和miR-582-5p的高表达及低表达例数,如图1E和图1F所示,骨转移前列腺 癌组织中,miR-582-3p和miR-582-5p低表达率均显著高于无骨转移前列腺癌组织,以上结果证明,miR-582-3p和miR-582-5p在骨转移前列腺癌组织中低表达。
实验例2、miR-582-3p和miR-582-5p在骨转移的前列腺癌细胞系中低表达
以前列腺癌细胞系为研究对象,培养正常的人前列腺上皮细胞RWPE-1和人前列腺癌细 胞系DU145、LNCaP、22Rv1、PC-3、VCaP、C4-2B,分别检测miR-582-3p和miR-582-5p 的表达量,结果如图2所示,与正常的人前列腺上皮细胞系RWPE-1相比,骨转移前列腺癌 细胞系PC-3、C4-2B、VCaP中miR-582-3p和miR-582-5p均低表达,细胞实验证明了miR-582-3p 和miR-582-5p在骨转移前列腺癌细胞系中低表达。
实验例3、miR-582-3p和miR-582-5p的低表达预示着低的前列腺癌患者无骨转移生存率
结合前列腺癌组织的临床病理数据,按前列腺癌组织中miR-582-3p和miR-582-5p表达 量的中位值对miR-582-3p和miR-582-5p分层为高表达量(H)和低表达量(L),对各分层内 病例进行Kaplan-Meier生存分析,结果如图3所示,miR-582-3p和miR-582-5p的表达量与前 列腺癌患者的总生存率无关,然而,miR-582-3p和miR-582-5p的低表达却均预示着更低的无 骨转移生存率。
实验例4、pri-miR-582的过表达抑制体内前列腺癌细胞的骨转移
将含有miR-582-3p和miR-582-5p序列的pri-miR-582构建载体转染到三组骨转移前列腺 癌细胞系中(PC-3、C4-2B、VCaP),如图4可见,与对照载体相比,三组骨转移前列腺癌细 胞系中,miR-582-3p和miR-582-5p表达量显著上调。
进一步地,将荧光素酶标记的对照载体或pri-miR-582过表达的PC-3细胞接种于裸鼠的 左心室,骨转移状况如图5所示,其中,BLI监测骨转移进展,X射线监测溶骨性病变,与 对照载体组相比,pri-miR-582过表达能抑制前列腺癌细胞骨转移能力(参考图5A和5B), 取胫骨肿瘤切片染色,可见pri-miR-582过表达能降低骨中的肿瘤负荷(参考图5C),并且与 对照载体组相比,转染了pri-miR-582过表达PC-3细胞的裸鼠具有更低的骨转移评分,更少 的溶骨性破坏,更高的总生存率和无骨转移生存率(参考图5D~5G)。
实验例5、miR-582-3p或miR-582-5p的上调表达抑制前列腺癌细胞的迁移和侵袭能力
将miR-582-3p模拟物和miR-582-5p模拟物单独转染至三组骨转移前列腺癌细胞系中 (PC-3、C4-2B、VCaP),用于评价miR-582-3p或miR-582-5p对前列腺癌细胞迁移和侵袭能 力的影响,结果如图6所示,上调miR-582-3p或miR-582-5p能减弱前列腺癌细胞的侵袭和 迁移能力,以上结果足以证明miR-582-3p或miR-582-5p具有抑制前列腺癌细胞的侵袭性和 迁移性。
实验例6、miR-582-3p和/或miR-582-5p参与前列腺癌骨转移的机制
为了探究miR-582-3p和/或miR-582-5p参与前列腺癌骨转移的分子机制,我们发现,上 调miR-582-3p和/或miR-582-5p能抑制TGF-β/Smad荧光素酶报告质粒的转录活性(参考图7), 因此我们预测miR-582-3p和/或miR-582-5p参与TGF-β信号通路。
结合生物信息学预测靶向位点,如图8所示,预测miR-582-3p靶向SMAD2、SMAD4、TGFBRI的3’-UTR;而miR-582-5p靶向SMAD2、SMAD4、TGFBRI、TGFBRII的3’-UTR。
进一步通过荧光素酶验证,结果如图9显示:上调miR-582-3p抑制SMAD2、SMAD4、TGFBRI的3’-UTR;而上调miR-582-5p抑制SMAD2、TGFBRI、TGFBRII的3’-UTR;同时 上调miR-582-3p和miR-582-5p则抑制SMAD2、SMAD4、TGFBRI、TGFBRII的3’-UTR。
此外,由于miR-582-3p和miR-582-5p过表达会导致迁移和侵袭能力受到抑制,我们进 一步研究,TGF-β信号通路或其组分(SMAD2或TGFBRI)能否解除上述被抑制的迁移和侵袭能力。结果如图10所示,在没有TGF-β的情况下,SMAD2或TGFBRI均不能解除对前 列腺癌细胞的迁移和侵袭能力的抑制,有TGF-β的情况下,前列腺癌细胞的迁移和侵袭能力 显著提高,被miR-582-3p和miR-582-5p过表达而抑制的迁移和侵袭能力得到恢复。以上结 果证明了miR-582-3p和miR-582-5p确实通过TGF-β信号通路,抑制前列腺癌细胞的侵袭和 迁移。
总结以上实验例,可以得出:(1)miR-582可应用于制备前列腺癌转移诊断试剂盒;由 于miR-582-3p和miR-582-5p在骨转移前列腺癌组织中低表达,并且表达量为无骨转移前列 腺癌组织的0.5~0.6倍,因此,可以由此作为诊断标准,判断是否发生前列腺癌转移。2、 miR-582可应用于制备前列腺癌预后试剂盒;由于前列腺癌无骨转移生存率与miR-582-3p和 miR-582-5p相关,因此利用无骨转移生存率作为预后指标,可用于预后判断。3、经过体内和 体外实验均证实pri-miR-582上调表达,能够抑制前列腺癌骨转移,并且抑制前列腺癌骨转移 细胞系迁移和侵袭能力,根据公知常识和以上结论可以预想:以下任意一种物质都有望用于 制备抑制前列腺癌骨转移的药物:1)能上调miR-582表达量的物质;2)能增强miR-582活 性的物质;3)能增长miR-582有效作用时间的物质;4)能增强miR-582稳定性的物质;其 中,能上调miR-582表达量的物质选自:1)miR-582分子;2)miR-582修饰物;3)miR-582 模拟物;4)编码miR-582的DNA;5)表达miR-582载体或病毒。
以上所述仅是用于解释本发明,应当指出,对于本技术领域的普通技术人员,在不脱离 本发明原理的前提下做出的若干改进和润饰,也应视为本发明的保护范围。
Claims (4)
1.检测miR-582的试剂在制备前列腺癌骨转移诊断试剂盒中的应用,所述miR-582选自miR-582-3p、miR-582-5p中的一种或几种。
2.根据权利要求1所述的应用,其特征在于:所述试剂选自特异于miR-582的引物、探针、芯片中的一种或多种。
3.检测miR-582的试剂在制备前列腺癌预后试剂盒中的应用,所述预后的指标为无骨转移生存时间/生存率,所述miR-582选自miR-582-3p、miR-582-5p中的一种或几种。
4.以下物质中的一种或多种在制备抑制前列腺癌骨转移药物中的应用:
1)miR-582分子;
2)miR-582修饰物;
3)miR-582模拟物;
4)编码miR-582的DNA;
5)表达miR-582载体或病毒;
所述miR-582选自miR-582-3p、miR-582-5p中的一种或几种。
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