CN102533966B - 用于乳腺癌的诊断、预后和治疗的基于MicroRNA的方法和组合物 - Google Patents
用于乳腺癌的诊断、预后和治疗的基于MicroRNA的方法和组合物 Download PDFInfo
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- CN102533966B CN102533966B CN201110319534.7A CN201110319534A CN102533966B CN 102533966 B CN102533966 B CN 102533966B CN 201110319534 A CN201110319534 A CN 201110319534A CN 102533966 B CN102533966 B CN 102533966B
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Abstract
本发明提供了用于乳腺癌的诊断、预后和治疗的新的方法和组合物。本发明还提供了鉴定抗乳腺癌试剂的方法。
Description
本申请是申请日为2006年7月31日、发明名称为“用于乳腺癌的诊断、预后和治疗的基于MicroRNA的方法和组合物”、申请号为200680036598.3的申请的分案申请。
发明背景
乳腺癌是美国和全球范围内的妇女的重大健康问题。尽管在疾病的检测和治疗上已取得了进步,但乳腺癌仍然是妇女中癌症相关性死亡的第二大病因,在美国其每年影响着180,000多位妇女。对于北美的妇女,一生中患乳腺癌的概率现在为八分之一。
目前没有用于治疗或预防乳腺癌的普遍成功的方法。目前乳腺癌的治疗依赖于早期诊断(例如,通过常规的乳腺筛查方法)和侵入性治疗的组合,其可包括多种治疗例如手术、放射疗法、化学疗法和激素疗法中的一种或多种。通常基于许多预后参数(包括特异性肿瘤标记的分析)来选择特定乳腺癌的疗程。参见,例如,Porter-Jordan和Lippman,Breast Cancer8:73-100(1994)。
尽管BRCA1和BRCA2的发现在鉴定参与乳腺癌的关键遗传因素中是非常重要的步骤,但已逐渐清楚BRCA1和BRCA2的突变只解释部分对乳腺癌的遗传易感性(Nathanson,K.L.等人,Human Mol.Gen.10(7):715-720(2001);Anglican Breast Cancer Study Group.Br.J.Cancer83(10):1301-08(2000);和Syrjakoski K.,等人,J.Natl.Cancer Inst.92:1529-31(2000))。尽管对乳腺癌的治疗进行了大量研究,但乳腺癌仍然难以有效地诊断和治疗,并且乳腺癌患者中观察到的高死亡率表明疾病的诊断、治疗和预防需要提高。
MicroRNA(微RNA)是通过与信使RNA(mRNA)靶杂交和引发其的翻译抑制或较不常见地引起其降解来控制基因表达的小的、非编码RNA种类。miRNA的发现和研究已揭示在生物发育和各种细胞过程例如细胞分化、细胞生长和细胞死亡中发挥重要作用的miRNA介导的基因调控机制(Cheng,A.M.,等人,Nucleic Acids Res.33:1290-1297(2005))。近年来的研究表明特定miRNA的异常表达可参与人的疾病例如神经障碍(neurological disorder)(Ishizuka,A.,等人,Genes Dev.16:2497-2508(2002))和癌症。具体地,已在人慢性淋巴细胞性白血病中发现miR-16-1和/或miR-15a的不当表达(misexpression)(Calin,G.A.,等人,Proc.Natl.Acad.Sci.U.S.A.99:15524-15529(2002))。
包含所有已知的人microRNA的微阵列的发展和应用已允许同时分析样品中的每一种miRNA的表达(Liu,C.G.,等人,Proc Natl.Acad.Sci U.S.A.101:9740-9744(2004))。这些microRNA微阵列不仅已用于确认miR-16-1在人CLL细胞中摆脱控制,而且还用于产生与良好建立的人CLL的临床病理特征关联的miRNA表达特征谱(Calin,G.A.,等人,Proc.Natl.Acad.Sci.U.S.A.101:1175-11760(2004))。
使用microRNA微阵列鉴定microRNA组群(其在正常细胞和乳腺癌细胞之间差异表达)(即,表达特征谱或表达谱)的用途可帮助精确识别参与乳腺癌的特异性miRNA。此外,这些miRNA的假定的靶的鉴定可帮助阐明它们的致病作用。本发明提供了用于乳腺癌的诊断、预后和治疗的新的方法和组合物。
发明概述
本发明部分基于相对于正常对照细胞,在乳腺癌细胞中差异表达的miRNA的乳腺癌特异性特征谱(Signature)的鉴定。
因此,本发明包括诊断受试者是否具有乳腺癌或处于发生乳腺癌 的风险中的方法,该方法包括测量来自受试者的受试样品中的至少一种miR基因产物的水平和将受试者样品中的miR基因产物的水平与对照样品中的相应的miR基因产物的水平比较。相对于对照样品中的相应的miR基因产物的水平,受试样品中的miR基因产物的水平的改变(例如增加、降低)表明受试者具有乳腺癌或处于发生乳腺癌的风险中。在某些实施方案中,所述至少一种miR基因产物选自miR-125b-1、miR125b-2、miR-145、miR-21、miR-155、miR-10b和其组合。
可使用许多本领域技术人员熟知的技术测量所述至少一种miR基因产物的水平。在一个实施方案中,使用Northern印迹分析测量所述至少一种miR基因产物的水平。在另一个实施方案中,可这样测量至少一种miR基因产物的水平:从获自受试者的受试样品反转录RNA以提供一组靶寡聚脱氧核苷酸,使靶寡聚脱氧核苷酸对包含miRNA特异性探针寡核苷酸的微阵列杂交以提供受试样品的杂交谱(hybridization profile),然后将受试样品的杂交谱与从对照样品产生的杂交谱进行比较。相对于对照样品,受试样品中至少一种miRNA的信号的改变表明受试者具有乳腺癌或处于发生乳腺癌的风险中。在特定的实施方案中,微阵列包含相当大部分的人miRNome的miRNA特异性探针寡核苷酸。在其他实施方案中,微阵列包含选自miR-145、miR-21、miR-155、miR-10b、miR-009-1(miR131-1)、miR-34(miR-170)、miR-102(miR-29b)、miR-123(miR-126)、miR-140-as、miR-125a、miR-125b-1、miR-125b-2、miR-194、miR-204、miR-213、let-7a-2、let-7a-3、let-7d(let-7d-v1)、let-7f-2、let-7i(let-7d-v2)、miR-101-1、miR-122a、miR-128b、miR-136、miR-143、miR-149、miR-191、miR-196-1、miR-196-2、miR-202、miR-203、miR-205、miR-206、miR-210和其组合的一种或多种miRNA的miRNA特异性探针寡核苷酸。
本发明也提供了诊断与一种或多种预后标记关联的乳腺癌的方法,该方法包括测量来自受试者的乳腺癌受试样品中的至少一种miR基因产物的水平和将所述乳腺癌受试样品中的至少一种miR基因产 物的水平与对照样品中相应的miR基因产物的水平进行比较。可使乳腺癌与一种或多种与乳腺癌相关的不利预后标记例如但不限于雌激素受体的表达、孕酮受体的表达、阳性淋巴节转移、高增殖指数、可检测的p53的表达、晚期肿瘤期和高血管侵袭关联。在一个实施方案中,这样测量所述至少一种miR基因产物的水平,即从获自受试者的受试样品反转录RNA以提供一组靶寡聚脱氧核苷酸,使靶寡聚脱氧核苷酸对包含miRNA特异性探针寡核苷酸的微阵列杂交,从而提供受试样品的杂交谱,然后将受试样品的杂交谱与从对照样品产生的杂交谱进行比较。相对于对照样品,受试样品中至少一种miRNA的信号的改变表明受试者具有与该一种或更多种预后标记关联的乳腺癌或处于发生与该一种或更多种预后标记关联的乳腺癌的风险中。在特定的实施方案中,微阵列包含选自miR-26a、miR-26b、miR-102(miR-29b)、miR-30a-5p、miR-30b、miR-30c、miR-30d、miR-185、miR-191、miR-206、miR-212、let-7c、miR-9-2、miR-15-a、miR-21、miR-30a-s、miR-133a-1、miR-137、miR-153-2、miR-154、miR-181a、miR-203、miR-213、let-7f-1、let-7a-3、let-7a-2、miR-9-3、miR-10b、miR-27a、miR-29a、miR-123、miR-205、let-7d、miR-145、miR-16a、miR-128b和其组合的miRNA的至少一种miRNA特异性探针寡核苷酸。
本发明也包括治疗受试者中的乳腺癌的方法,其中至少一种miR基因产物在受试者的癌细胞中摆脱控制(例如,下调,上调)。当该至少一种分离的miR基因产物在乳腺癌细胞中被下调时,该方法包括施用有效量的该至少一种分离的miR基因产物,从而使受试者中的癌细胞的增殖被抑制。在一个实施方案中,方法包括施用有效量的该至少一种分离的miR基因产物,条件是该miR基因不是miR-15a或miR-16-1,这样受试者的癌细胞的增殖被抑制。当所述至少一种分离的miR基因产物在癌细胞中被上调时,所述方法包括给受试者施用有效量的至少一种用于抑制所述至少一种miR基因表达的化合物,这样乳腺癌细胞的增殖被抑制。
在相关的实施方案中,本发明提供了治疗受试者的乳腺癌的方法, 其包括确定相对于对照细胞,来自受试者的乳腺癌细胞中的至少一种miR基因产物的量。如果miR基因产物在乳腺癌细胞中脱离控制,则该方法进一步包括改变在乳腺癌细胞中表达的该至少一种miR基因产物的量。如果癌细胞中表达的miR基因产物的量低于对照细胞中表达的miR基因产物的量,那么该方法包括施用有效量的至少一种分离的miR基因产物。在一个实施方案中,miR基因产物不是miR-15a或miR-16-1。如果癌细胞中表达的miR基因产物的量比对照细胞中表达的miR基因产物的量大,那么该方法包括给受试者施用有效量的至少一种用于抑制该至少一种miR基因的表达的化合物。在一个实施方案中,miR基因产物不是miR-15a或miR-16-1。
本发明还提供了用于治疗乳腺癌的药物组合物。在一个实施方案中,药物组合物包含至少一种分离的miR基因产物和药学上可接受的载体。在特定的实施方案中,该至少一种miR基因产物相应于miR基因产物,该基因产物相对于合适的对照细胞在乳腺癌细胞中具有减少的表达水平。在某些实施方案中,分离的miR基因产物选自miR-145、miR-10b、miR-123(miR-126)、miR-140-as、miR-125a、miR-125b-1、miR-125b-2、miR-194、miR-204、let-7a-2、let-7a-3、let-7d(let-7d-v1)、let-7f-2、miR-101-1、miR-143和其组合。
在另一个实施方案中,本发明的药物组合物包含至少一种miR表达抑制性化合物。在特定的实施方案中,该至少一种miR表达抑制性化合物对于miR基因是特异性的,所述miR基因的表达在乳腺癌细胞中比在对照细胞中强。在某些实施方案中,miR表达抑制化合物对于选自miR-21、miR-155、miR-009-1(miR131-1)、miR-34(miR-170)、miR-102(miR-29b)、miR-213、let-7i(let-7d-v2)、miR-122a、miR-128b、miR-136、miR-149、miR-191、miR-196-1、miR-196-2、miR-202、miR-203、miR-206、miR-210、miR-213和其组合的一种或多种miR基因产物是特异性的。
本发明还包括鉴定抗乳腺癌试剂的方法,其包括对细胞提供受试试剂和测量细胞中至少一种miR基因产物的水平。在一个实施方案中, 该方法包括对细胞提供受试试剂和测量至少一种与乳腺癌细胞中减少的表达水平相关的miR基因产物的水平。相对于合适的对照细胞,细胞中miR基因产物水平的增加表明受试试剂为抗乳腺癌试剂。在特定的实施方案中,所述与乳腺癌细胞中减少的表达水平相关的至少一种miR基因产物选自miR-145、miR-10b、miR-123(miR-126)、miR-140-as、miR-125a、miR-125b-1、miR-125b-2、miR-194、miR-204、let-7a-2、let-7a-3、let-7d(let-7d-v1)、let-7f-2、miR-101-1、miR-143和其组合。
在其他实施方案中,该方法包括对细胞提供受试试剂,和测量至少一种与乳腺癌细胞中增加的表达水平相关的miR基因产物的水平。相对于合适的对照细胞,细胞中miR基因产物水平的减少表明受试试剂为抗乳腺癌试剂。在特定的实施方案中,所述与乳腺癌细胞中增加的表达水平相关的至少一种miR基因产物选自miR-21、miR-155、miR-009-1(miR131-1)、miR-34(miR-170)、miR-102(miR-29b)、miR-213、let-7i(let-7d-v2)、miR-122a、miR-128b、miR-136、miR-149、miR-191、miR-196-1、miR-196-2、miR-202、miR-203、miR-206、miR-210、miR-213和其组合。
附图概述
本专利或申请文件包含至少一个彩色附图。具有彩色附图的本专利或专利申请的拷贝在请求和支付必要的费用后由专利局提供。
图1描述了由聚类分析产生的显示基于差异microRNA表达(P<0.05)区分乳腺癌组织与正常组织的树。图底部的条块标示癌症组群(红色)或正常乳腺组织(黄色)。
图2是描述基于PAM分析,各样品为癌组织或正常组织的概率(0.0至1.0)的图。借助表2中显示的miR特征谱正确地预测了所有乳腺癌和正常组织。
图3A是描述使用miR-125b互补探针检测的miR-125b在正常样品和来自乳腺癌患者(P)的几个肿瘤样品中的表达水平的Northern印 迹。U6探针用于标准化各样品的表达水平。
图3B是描述使用miR-145互补探针检测的miR-145在正常样品和来自乳腺癌患者(P)的几个肿瘤样品中的表达水平的Northern印迹。U6探针用于标准化各样品的表达水平。
图3C是描述使用miR-21互补探针检测的miR-21在正常样品和来自乳腺癌患者(标记为编号的患者)的几个肿瘤样品中的表达水平的Northern印迹。U6探针用于标准化各样品的表达水平。
图3D是描述microRNA miR-125b、miR-145和miR-21在不同乳腺癌细胞系中的表达水平的Northern印迹。也确定了各microRNA在来自正常组织样品中的表达水平。U6探针用于标准化各样品的表达水平。
图4A是列出在与雌激素受体的存在(ER+)或不存在(ER-)相关的乳腺癌样品中差异表达的miRNA的表。
图4B是列出在与孕酮受体的存在(PR+)或不存在(PR-)相关的乳腺癌样品中差异表达的miRNA的表。
图4C是列出在与肿瘤的1期(pT1)或2或3期(pT2-3)相关的乳腺癌样品中差异表达的miRNA的表。
图4D是列出在与淋巴结转移的存在(pN0)或不存在(pN10+)相关的乳腺癌样品中差异表达的miRNA的表。
图4E是列出在与血管侵袭的存在或不存在相关的乳腺癌样品中差异表达的miRNA的表。
图4F是列出在与高(MIB-1>30)或低(MIB-1<20)增殖指数(PI)相关的乳腺癌样品中差异表达的miRNA的表。
图4G是列出在与p53的阳性(p53+)或阴性(p53-)免疫染色相关的乳腺癌样品中差异表达的miRNA的表。
发明详述
本发明部分基于特定miRNA和microRNA的鉴定,所述miRNA的表达相对于正常对照细胞,在乳腺癌细胞中发生改变,所述microRNA的表达在与特定的预后特征相关的乳腺癌细胞中相对于缺乏这些特征 的乳腺癌细胞发生改变。
如在此处可互换使用,“miR基因产物”、“microRNA”、“miR”或“miRNA”意指来自miR基因的未加工的或加工的RNA转录物。由于miR基因产物不翻译成蛋白质,术语“miR基因产物”不包括蛋白质。未加工的miR基因转录物也称为“miR前体”,其通常包含长度大约为70-100个核苷酸的RNA转录物。可通过使用RNA酶(例如,Dicer、Argonaut或RNA酶III,例如大肠杆菌(E.coli)RNA酶III))进行降解来将miR前体加工成具有活性的19-25个核苷酸的RNA分子。该19-25个核苷酸的活性RNA分子也称为“经加工的”miR基因转录物或“成熟的”miRNA。
可通过天然加工途径(例如,使用完整的细胞或细胞裂解物)或通过合成加工途径(例如,使用分离的加工酶例如分离的Dicer、Argonaut或RNA酶III)从miR前体获得具有活性的19-25个核苷酸的RNA分子。要理解也可通过生物学或化学合成直接产生19-25核苷酸的活性RNA分子,而不用从miR前体加工而来。
表1中提供了187个miR基因产物的序列。以5’至3’的方向给出此处的所有核酸序列。此外,用斜体字表示基因,用正常型表示基因产物;例如,mir-17是基因,而miR-17是基因产物。
本发明包括诊断受试者是否具有乳腺癌或处于发生乳腺癌的风险中的方法,该方法包括测量来自受试者的乳腺癌受试样品中的至少一种miR基因产物的水平和将受试样品中的miR基因产物的水平与对照样品中相应的miR基因产物的水平进行比较。如此处所用的,“受试者”可以是具有或怀疑具有乳腺癌的任何哺乳动物。在特定的实施方案中,受试者是具有或怀疑具有乳腺癌的人。
乳腺癌可以是乳腺癌的任何形式和可以与一种或更多种预后标记或特征(包括,但不限于,雌激素受体的表达、孕酮受体的表达、淋巴节转移、高增殖指数、可检测的p53的表达、晚期肿瘤期和高血管侵袭)相关。预后标记可以与不利的或消极的预后关联,或其可与好的或积极的预后关联。
表1-人miR基因产物序列
*前体序列中下划线标示的序列代表经加工的miR转录物。所有序列是人的序列。
可测量获自受试者的生物样品的细胞中的至少一种miR基因产物的水平。例如,可通过常规活组织检查技术从怀疑具有与之相关的乳腺癌的受试者获取组织样品。在另一个例子中,可从受试者取得血液样品,和可通过标准技术分离白细胞用于DNA提取。优选在开始放射疗法、化学疗法或其他疗法之前从受试者获得血液或组织样品。可从受试者的未受影响的组织、从正常的人个体或动物个体群体或从相应于受试者的样品中的大部分细胞的培养细胞获得相应的对照组织或血液样品。然后将对照组织或血液样品随同来自受试者的样品一起处理,这样可将从来自受试者的样品的细胞中的给定的miR基因产生的miR基因产物的水平与来自对照样品的细胞的相应的miR基因产物水平比较。
相对于对照样品中的相应的miR基因产物水平,获自受试者的样品中的miR基因产物的水平的改变(即,增加或减少)表明乳腺癌存在于受试者中。在一个实施方案中,受试样品中的所述至少一种miR基因产物的水平比对照样品中相应的miR基因产物的水平高(即,miR 基因产物的表达被“上调”)。如此处所用的,当来自受试者的细胞或组织样品中的miR基因产物的量比对照细胞或组织样品中的相同基因产物的量大时,miR基因产物的表达被“上调”。在另一个实施方案中,受试样品中的所述至少一种miR基因产物的水平比对照样品中相应的miR基因产物的水平低(即,miR基因产物的表达被“下调”)。如此处所用的,当从来自受试者的细胞或组织样品中的基因产生的miR基因产物的量比从对照细胞或组织样品中的相同基因产生的量少时,miR基因产物的表达被“下调”。可就一种或更多种RNA表达标准确定对照和正常样品中的相对miR基因表达。标准可包括例如零miR基因表达水平、标准细胞系中的miR基因表达水平或之前获得的正常人对照群体的miR基因表达的平均水平。
可使用适合用于检测生物样品中的RNA表达水平的任何技术测量样品中的miR基因产物的水平。用于确定来自生物样品的细胞中的RNA表达水平的合适技术(例如,Northern印迹分析、RT-PCR、原位杂交)对于本领域技术人员来说是熟知的。在特定的实施方案中,使用Northern印迹分析来检测至少一种miR基因产物的水平。例如,可在核酸提取缓冲液存在的情况下通过匀浆,然后进行离心来从细胞纯化总细胞RNA。沉淀核酸,然后通过用DNA酶处理和沉淀来除去DNA。然后按照标准技术通过在琼脂糖凝胶上进行凝胶电泳来分离RNA分子,之后将其转移至硝酸纤维素滤膜。然后通过加热将RNA固定在滤膜上。使用适当标记的与所述RNA互补的DNA或RNA探针检测和定量特定RNA。参见,例如,Molecular Cloning:A Laboratory Manual,J.Sambrook等人,eds.,第2版,Cold Spring Harbor Laboratory Press,1989,第7章,其全部公开内容在此引用作为参考。
可从表1中提供的核酸序列产生用于给定的miR基因产物的Northern印迹杂交的合适的探针。在Molecular Cloning:A Laboratory Manual,J.Sambrook等人,eds.,第2版,Cold Spring Harbor Laboratory Press,1989,第10和11章(其公开内容在此引用作为参考)中描述了用于制备标记的DNA和RNA探针的方法和用 于其对靶核苷酸序列的杂交的条件。
例如,可用例如放射性核素例如3H、32P、33P、14C或35S;重金属;或能够充当被标记的配体的特异性结合对成员的配体(例如,生物素、抗生物素蛋白或抗体)、荧光分子、化学发光分子、酶等来标记核酸。
可通过Rigby等人(1977),J.Mol.Biol.113:237-251的切口平移法或通过Fienberg等人(1983),Anal.Biochem.132:6-13的随机引物法来将探针标记至高比活性,所述参考资料的全部公开内容在此引用作为参考。后者是用于从单链DNA或从RNA模板合成高比活性的32P标记的探针的首选方法。例如,按照切口平移法,通过用高放射性核苷酸取代预先存在的核苷酸,可能制备具有远超过108cpm/微克的比活性的32P标记的核酸探针。然后可通过将杂交的滤膜暴露于照相胶片来进行杂交的放射自显影检测。由杂交滤膜暴光的照相胶片的光密度扫描提供了miR基因转录物水平的精确测量。通过使用另一种方法,可通过计算机成像系统例如可从Amersham Biosciences,Piscataway,NJ获得的Molecular Dynamics 400-B 2D磷光计定量miR基因转录物的水平。
当不能实现DNA或RNA探针的放射性核素标记时,可使用随机引物法将类似物例如dTTP类似物5-(N-(N-生物素基-ε-氨己酰基)-3-氨基烯丙基)脱氧尿苷三磷酸整合入探针分子。可通过与偶联至荧光染料或产生颜色反应的酶的生物素结合蛋白例如抗生物素蛋白、链霉抗生物素和抗体(例如,抗生物素抗体)反应来检测生物素化的探针寡核苷酸。
除了Northern和其他RNA杂交技术外,还可使用原位杂交技术来确定RNA转录物的水平。该技术需要比Northern印迹技术更少的细胞,其包括将整个细胞沉积在显微镜盖玻片上,然后用含有放射性或其它标记的核酸(例如cDNA或RNA)探针的溶液探测细胞的核酸含量。该技术特别适合用于分析来自受试者的组织活检样品。在美国专利5,427,916(其全部公开内容在此引用作为参考)中更详细地描述了原位杂交技术的实践。如上所述,可从表1提供的核酸序列产生用于给 定的miR基因产物的原位杂交的合适探针。
还可通过miR基因转录物的反转录,然后通过聚合酶链式反应扩增反转录的转录物(RT-PCR)来确定细胞中miR基因转录物的相对数目。可通过与内部标准例如来自存在于相同样品中的“管家”基因的mRNA的水平比较来定量miR基因转录物的水平。用作内部对照的合适的“管家”基因包括例如肌球蛋白或甘油醛-3-磷酸脱氢酶(G3PDH)。用于定量RT-PCR和其变化形式的方法在本领域技术人员的能力范围之内。
在一些情况下,可能希望同时确定样品中许多不同miR基因产物的表达水平。在其他情况下,可能希望确定所有已知的与癌症相关的miR基因的转录物的表达水平。评估数百种miR基因的癌症特异性表达水平是非常耗时的并且需要大量总RNA(对于每个Northern印迹至少20μg)和需要放射性同位素的放射自显影技术。
为克服这些限制,可构建微芯片形式(microchip format)的寡核苷酸文库(oligolibrary)(即,微阵列),该文库包含对于一组miR基因是特异性的一组探针寡聚脱氧核苷酸。通过使用该微阵列,可通过反转录RNA以产生一组靶寡聚脱氧核苷酸,然后使其对微阵列上的探针寡聚脱氧核苷酸杂交,从而产生杂交或表达谱来确定生物样品中多种microRNA的表达水平。然后将受试样品的杂交谱与对照样品的进行比较以确定乳腺癌细胞中表达水平发生变化的microRNA。如此处所用的,“探针寡核苷酸”或“探针寡聚脱氧核苷酸”是指能够对靶寡核苷酸杂交的寡核苷酸。“靶寡核苷酸”或“靶寡聚脱氧核苷酸”是指待检测(例如通过杂交)的分子。“miR特异性探针寡核苷酸”或“对于miR是特异性的探针寡核苷酸”是指具有选择的对特异miR基因产物杂交或对特异miR基因产物的反转录物杂交的序列的探针寡核苷酸。
特定样品的“表达谱”(expression profile)或“杂交谱”(hybridization profile)基本上是样品的状态的指纹图谱;尽管两种状态可具有相似表达的任何特定基因,但同时评估许多基因可允许 产生对于细胞的状态是独特的基因表达谱。即,正常组织可与乳腺癌组织区别,并且在乳腺癌组织内,可确定不同的预后状态(例如,良好的或较差的长期存活希望)。通过比较不同状态中的乳腺癌组织的表达谱,可获得关于哪个基因在这些状态中的各状态中是重要(包括基因的上调和下调)的信息。在乳腺癌组织或正常乳腺组织中差异表达的序列的鉴定以及导致不同的预后结果的差异表达的鉴定允许以许多方式使用该信息。例如,可评价(例如,确定化疗药物是否起着改善特定患者的长期预后的作用)特定的治疗方案。类似地,可通过将患者的样品与已知的表达谱比较来进行或确认诊断。此外,这些基因表达谱(或个体基因)允许筛选抑制乳腺癌表达谱或将不良预后谱转变成更好的预后谱的药物候选者。
因此,本发明提供了诊断受试者是否具有乳腺癌或处于发生乳腺癌的风险中的方法,其包括反转录来自获自受试者的受试样品的RNA以提供一组靶寡聚脱氧核苷酸,使靶寡聚脱氧核苷酸对包含miRNA特异性探针寡核苷酸的微阵列杂交,从而提供受试样品的杂交谱,然后将受试样品的杂交谱与从对照样品产生的杂交谱比较,其中至少一种miRNA的信号的改变表明受试者具有乳腺癌或处于发生乳腺癌的风险中。在一个实施方案中,微阵列包含相当大部分人miRNome的miRNA特异性探针寡核苷酸。在特定的实施方案中,微阵列包含选自miR-125b、miR-145、miR-21、miR-155、miR-10b、miR-009-1(miR131-1)、miR-34(miR-170)、miR-102(miR-29b)、miR-123(miR-126)、miR-140-as、miR-125a、miR-125b-1、miR-125b-2、miR-194、miR-204、miR-213、let-7a-2、let-7a-3、let-7d(let-7d-v1)、let-7f-2、let-7i(let-7d-v2)、miR-101-1、miR-122a、miR-128b、miR-136、miR-143、miR-149、miR-191、miR-196-1、miR-196-2、miR-202、miR-203、miR-206、miR-210和其组合的一种或多种miRNA的miRNA特异性探针寡核苷酸。在其他实施方案中,所述至少一种miR基因产物选自miR-125b、miR-145、miR-21、miR-155、miR-10b和其组合。
可以从于已知的miRNA序列产生的基因特异性寡核苷酸探针制备微阵列。微阵列可包含每种miRNA两种不同的寡核苷酸探针,一种包含成熟的活性序列,另一种对于该miRNA的前体是特异性的。微阵列还可以包含对照,例如一个或多个与人直系同源物(ortholog)只相异少数碱基的小鼠序列,该序列可用作杂交严紧性条件的对照。还可将来自两个物种的tRNA印刷在微芯片上,为特异的杂交提供了内部的、相对稳定的阳性对照。还可在微芯片上包含非特异性杂交的一个或多个合适的对照。为此,基于与任何已知的miRNA不存在任何同源性来选择序列。
可使用本领域内已知的技术制造微芯片。例如,在位置C6上对合适长度例如40个核苷酸的探针寡核苷酸进行5’-胺修饰,然后使用可商购获得的微阵列系统例如GeneMachine OmniGridTM100Microarrayer和Amersham CodeLinkTM活化的载玻片进行印刷。通过用标记的引物反转录靶RNA来制备相应于靶RNA的标记的cDNA寡聚物。在第一链合成后,使RNA/DNA杂交体变性以降解RNA模板。然后将所制备的标记的靶cDNA在杂交条件下对微阵列芯片杂交,所述条件是例如在25℃下在6X SSPE/30%甲酰胺中进行18小时,然后在37℃下在0.75X TNT中洗涤40分钟。杂交在阵列上在固定的探针DNA识别样品中的互补靶cDNA的位置上发生。标记的靶cDNA标记了阵列上发生结合的确切位置,从而允许自动检测和定量。输出由一列杂交事件组成,其显示了特定cDNA序列的相对丰度,从而显示患者样品中相应的互补miR的相对丰度。根据一个实施方案,标记的cDNA寡聚物是从生物素标记的引物制备的生物素标记的cDNA。然后通过使用例如链霉抗生物素-Alexa647缀合物直接检测含生物素的转录物来处理微阵列和使用常规的扫描方法扫描微阵列。阵列上各点的成像强度与患者样品中相应的miR的丰度呈比例。
阵列的使用对于miRNA表达的检测具有几个有利方面。第一,可在一个时间点上在相同的样品中鉴定数百个基因的整体表达。第二,通过寡核苷酸探针的仔细设计,可鉴定成熟和前体分子的表达。第三, 与Northern印迹分析相比,芯片需要少量的RNA,并且通过使用2.5μg的总RNA可提供可重复的结果。相对有限数量的miRNA(每样品数百个)允许构建几个物种的共同微阵列,对于各物种具有不同的寡核苷酸。该工具允许对不同条件下各已知miR的跨物种表达进行分析。
除了用于特定miR的定量表达水平测定外,包含相应于相当大部分的miRNome(优选整个miRNome)的miRNA特异性探针寡核苷酸的微芯片可用于进行miR基因表达谱分析,从而进行miR表达模式的分析。不同的miR特征谱可与已建立的疾病标记或直接与疾病状态相关联。
根据此处描述的表达谱分析法(expression profiling method),定量反转录来自获自怀疑具有癌症(例如,乳腺癌)的受试者的样品的总RNA以提供一组与样品中的RNA互补的标记的靶寡聚脱氧核苷酸。然后使靶寡聚脱氧核苷酸与包含miRNA特异性探针寡核苷酸的微阵列杂交,从而提供样品的杂交谱。结果是展示样品中miRNA的表达模式的样品的杂交谱。杂交谱包含来自靶寡聚脱氧核苷酸(来自样品)对微阵列中的miRNA特异性探针寡核苷酸的杂交的信号。该谱可记录为结合的存在或不存在(信号对零信号)。更优选,记录的谱包括来自各杂交的信号的强度。将谱与从正常即非癌性的对照样品产生的杂交谱进行比较。信号的改变表明受试者中存在癌症。
用于测量miR基因表达的其他技术也在本领域技术人员的能力范围之内,并且包括用于测量RNA转录和降解的速率的各种技术。
本发明也提供了诊断与一种或多种预后标记关联的乳腺癌的方法,包括测量来自受试者的乳腺癌受试样品中至少一种miR基因产物的水平和将该乳腺癌受试样品中至少一种miR基因产物的水平与对照样品中相应的miR基因产物的水平进行比较。相对于对照样品,受试样品中至少一种miRNA的信号的改变(例如,增加、减少)表明受试者具有与该一种或多种诊断预后标记相关的乳腺癌或处于发生与该一种或多种诊断预后标记相关的乳腺癌的风险中。
乳腺癌可以与一种或多种预后标记或特征包括与不利(即,消极的)预后相关的标记或与好的(即积极的)预后相关的标记相关。在 某些实施方案中,使用此处描述的方法诊断的乳腺癌与一种或多种不利的预后特征相关,所述预后特征选自雌激素受体的表达、孕酮受体的表达、阳性淋巴节转移、高增殖指数、可检测的p53的表达、晚期肿瘤期和高血管侵袭。此处描述了其表达在与这些预后标记中的各标记相关的乳腺癌细胞中发生改变的特定microRNA(参见,例如,实施例3和图4)。在一个实施方案中,通过从获自受试者的受试样品反转录RNA以提供一组靶寡聚脱氧核苷酸,使靶聚脱氧核苷酸对包含miRNA特异性探针寡核苷酸的微阵列杂交,从而提供受试样品的杂交谱,然后将受试样品杂交谱与从对照样品产生的杂交谱进行比较,来测量至少一种的miR基因产物的水平。
不希望受任何一个理论的束缚,据认为细胞中一种或多种miR基因产物的水平的变化可导致这些miR的一个或多个预期的靶的失去调节,这可导致乳腺癌的形成。因此,改变miR基因产物的水平(例如,通过减少在乳腺癌细胞中被上调的miR的水平,通过增加在癌细胞中被下调的miR的水平)可成功地治疗乳腺癌。此处描述了在乳腺癌组织中失去调节的miRNA的假定的基因靶的实例(参见,例如,实施例2和表4)。
因此,本发明包括治疗受试者中的乳腺癌的方法,其中至少一种miR基因产物在受试者的癌细胞中摆脱控制(例如,下调、上调)。当该至少一种分离的miR基因产物在乳腺癌细胞中下调时,该方法包括施用有效量的该至少一种分离的miR基因产物,条件是miR基因不是miR15或miR16,这样受试者癌细胞的增殖被抑制。当该至少一种分离的miR基因产物在癌细胞中上调时,该方法包括对受试者施用有效量的至少一种抑制该至少一种miR基因表达的化合物(此处称为miR基因表达抑制性化合物),这样乳腺癌细胞的增殖被抑制。
如此处所用的,术语“治疗”、“医治”和“医疗”是指改善与疾病或病症例如乳腺癌相关的症状,包括预防或延迟疾病的症状发生和/或减少疾病或病症的症状的严重度或频率。术语“受试者”和“个体”在此处定义为包括动物例如哺乳动物,包括但不限于,灵长类动 物、牛、绵羊、山羊、马、狗、猫、兔子、豚鼠、大鼠、小鼠或其他牛、羊、马、犬类、猫科动物、啮齿类动物或鼠类物种。在优选实施方案中,动物是人。
如此处所用的,分离的miR基因产物的“有效量”是足以抑制遭受乳腺癌的受试者中癌细胞增殖的量。通过考虑因素例如受试者的身材大小和体重、疾病侵入的程度、受试者的年龄、健康和性别、给药途径以及给药是局部的还是全身性的,本领域技术人员可容易地确定对给定受试者施用的miR基因产物的有效量。
例如,分离的miR基因产物的有效量可基于被治疗的肿瘤块的近似重量。可通过计算团块的近似体积确定肿瘤块的近似重量,其中1立方厘米的体积大致相当于1克。基于肿瘤块的重量的分离的miR基因产物的有效量可以在大约10-500微克/克的肿瘤块的范围内。在某些实施方案中,肿癌块可以是至少大约10微克/克的肿瘤块,至少大约60微克/克的肿瘤块或至少大约100微克/克的肿瘤块。
分离的miR基因产物的有效量可基于被治疗的受试者的近似或估计的体重。优选,如此处所描述的,通过胃肠外或肠内给药施用该有效量。例如,对受试者施用的分离的miR基因产物的有效量可在大约5至3000微克/kg的体重,大约700至1000微克/kg的体重的范围内变动,或大于大约1000微克/kg的体重。
本领域技术人员也可容易地确定对给定的受试者施用分离的miR基因产物的合适的剂量方案。例如,可对受试者施用miR基因产物一次(例如,作为单次注射或沉积(deposition))。可供选择地,可每天1次或2次对受试者施用miR基因产物,进行大约3至大约28天,更特别地大约7至大约10天的时期。在特定的剂量给药方案中,每天1次施用miR基因产物,进行7天。当剂量方案包括多次施用时,要理解对受试者施用的miR基因产物的有效量可包括在整个剂量方案中施用的基因产物的总量。
如此处所用的,“分离的”miR基因产物是合成的或通过人干预从天然状态改变的或获取的产物。例如,合成的miR基因产物或部分 地或完全地从与其天然状态的共存材料分离的miR基因产物被认为是“分离的”。分离的miR基因产物可以基本上纯化的形式存在,或可存在于已递送了该miR基因产物的细胞中。因此,有意递送至细胞或有意在细胞中表达的miR基因产物被认为是“分离的”miR基因产物。在细胞从miR前体的分子产生的miR基因产物也被认为是“分离的”分子。
可使用许多标准技术获得分离的miR基因产物。例如,可使用本领域内已知的方法化学合成或重组产生miR基因产物。在一个实施方案中,使用适当保护的核糖核苷亚磷酰胺和常规的DNA/RNA合成仪化学合成miR基因产物。合成的RNA分子或合成试剂的提供商包括例如Proligo(Hamburg,Germany)、Dharmacon Research(Lafayette,CO,U.S.A.)、Pierce Chemical(part of Perbio Science,Rockford,IL,U.S.A.)、Glen Research(Sterling,VA,U.S.A.)、ChemGenes(Ashland,MA,U.S.A.)和Cruachem(Glasgow,UK)。
可供选择地,可使用任何合适的启动子从重组环状或线性DNA质粒表达miR基因产物。用于从质粒表达RNA的合适的启动子包括例如U6或H1RNA pol III启动子序列或巨细胞病毒启动子。其他合适的启动子的选择在本领域技术人员的能力范围之内。本发明的重组质粒还可包含用于在癌细胞中表达miR基因产物的诱导型或调控型启动子。
可通过标准技术从培养细胞表达系统分离从重组质粒表达的miR基因产物。也可将从重组质粒表达的miR基因产物递送至和直接在癌细胞中表达。下面更详细地讨论重组质粒用于将miR基因产物递送至癌细胞的用途。
可从分开的重组质粒表达miR基因产物,或可从相同的重组质粒表达它们。在一个实施方案中,miR基因产物从单个质粒表达为RNA前体分子,然后前体分子通过合适的加工系统(包括但不限于存在于癌细胞内的加工系统)加工成功能性miR基因产物。其他合适的加工系统包括,例如,体外果蝇细胞裂解物系统(lysate system)(例如, 如属于Tuschl等人的美国公开专利申请号2002/0086356中描述的,其全部公开内容在此引用作为参考)和大肠杆菌RNA酶III系统(例如,如属于Yang等人的美国公开专利申请号2004/0014113中描述的,其全部公开内容在此引用作为参考)。
适合用于表达miR基因产物的质粒的选择,用于将核酸序列插入质粒以表达基因产物的方法和将重组质粒递送入目的细胞的方法在本领域技术人员的能力范围之内。参见,例如,Zeng等人(2002),Molecular Cell 9:1327-1333;Tuschl(2002),Nat.Biotechnol,20:446-448;Brummelkamp等人(2002),Science 296:550-553;Miyagishi等人(2002),Nat.Biotechnol.20:497-500;Paddison等人(2002),Genes Dev.16:948-958;Lee等人(2002),Nat.Biotechnol.20:500-505;和Paul等人(2002),Nat.Biotechnol.20:505-508,其全部公开内容在此引用作为参考。
在一个实施方案中,表达miR基因产物的质粒包含在CMV即早期启动子控制之下的编码miR前体RNA的序列。如此处所用的,“在启动子控制之下”意指编码miR基因产物的核酸序列位于启动子的3’,这样启动子可起始编码miR基因产物的序列的转录。
也可从重组病毒载体表达miR基因产物。可从两个分开的重组病毒载体或从相同的病毒载体表达miR基因产物。可通过标准技术从培养细胞表达系统分离从重组病毒载体表达的RNA,或可在癌细胞中直接表达它。下面更详细地描述重组病毒载体将miR基因产物递送至癌细胞的用途。
本发明的重组病毒载体包含编码miR基因产物和用于表达RNA序列的任何合适的启动子的序列。合适的启动子包括例如U6或H1RNApol III启动子序列或巨细胞病毒启动子。其他合适的启动子的选择在本领域技术人员的能力范围之内。本发明的重组病毒载体还可包含用于在癌细胞中表达miR基因产物的诱导型或调控型启动子。
可使用能够接受miR基因产物的编码序列的任何病毒载体;例如来源于腺病毒(AV)、腺伴随病毒(AAV)、逆转录病毒(例如,慢病毒 (LV)、杆状病毒、鼠白血病病毒)、疱疹病毒等的载体。适当时,可通过用包膜蛋白和来自其他病毒的其他表面蛋白假型化载体或通过置换不同的病毒衣壳蛋白来改变病毒载体的向性。
例如,可用来自水泡性口膜炎病毒(VSV)、狂犬病毒病毒、埃博拉病毒、莫科拉病等的表面蛋白假型化本发明的慢病毒载体。通过对载体进行基因工程改造以表达不同的衣壳蛋白血清型来产生本发明的AAV载体,从而使其靶向不同的细胞。例如,在血清2型基因组上表达血清2型衣壳的AAV载体称为AAV 2/2。可用血清5型衣壳蛋白基因取代AAV2/2载体中的该血清2型衣壳蛋白基因以产生AAV 2/5载体。用于构建表达不同的衣壳蛋白血清型的AAV载体的技术在本领域技术人员的能力范围之内;参见,例如,Rabinowitz,J.E.,等人(2002),J.Virol.76:791-801,其全部公开内容在此引用作为参考。
适合用于本发明的重组病毒载体的选择、用于将表达RNA的核酸序列插入载体的方法、将病毒载体递送至目的细胞的方法以及表达的RNA产物的回收在本领域技术人员的能力范围之内。参见,例如,Dornburg(1995),Gene Therap.2:301-310;Eglitis(1988),Biotechniques 6:608-614;Miller(1990),Hum.Gene Therap.1:5-14;和Anderson(1998),Nature 392:25-30,其全部公开内容在此引用作为参考。
特别合适的病毒载体是来源于AV和AAV的载体。用于表达本发明的miR基因产物的合适的AV载体、用于构建重组AV载体的方法以及将载体递送入靶细胞的方法描述于Xia等人(2002),Nat.Biotech.20:1006-1010中,其全部公开内容在此引用作为参考。用于表达miR基因产物的合适的AAV载体、用于构建重组AAV载体的方法以及将载体递送入靶细胞的方法描述于Samulski等人(1987),J.Virol.61:3096-3101;Fisher等人(1996),J.Virol.,70:520-532;Samulski等人(1989),J.Virol.63:3822-3826;美国专利号5,252,479;美国专利号5,139,941;国际专利申请号WO 94/13788;和国际专利申请号WO 93/24641,其全部公开内容在此引用作为参考。 在一个实施方案中,从包含CMV立即早期启动子的单个重组AAV载体表达miR基因产物。
在某一实施方案中,本发明的重组AAV病毒载体包含在人U6RNA的控制下、与polyT终止序列有效连接的编码miR前体RNA的核酸序列。如此处所用的,“与polyT终止序列有效连接”是指编码有义或反义链的核酸序列以5’方向与polyT终止信号直接相邻。在从载体转录miR序列的过程中,polyT终止信号起着终止转录的作用。
在本发明的治疗方法的其他实施方案中,还可对受试者施用有效量的至少一种抑制miR表达的化合物。如此处所用的,“抑制miR表达”是指在治疗后miR基因产物的活性、成熟形式的产量比治疗前产生的量低。通过使用例如上述用于诊断方法的确定miR转录水平的技术,本领域技术人员可容易地确定miR的表达在癌细胞中是否已被抑制。抑制可在基因表达的水平上发生(即,通过抑制编码miR基因产物的miR基因的转录)或在加工水平上发生(例如,通过抑制miR前体至成熟的、活性miR的加工)。
如此处所用的,抑制miR表达的化合物的有效量是足以在遭受与癌相关性染色体特征相关的癌症的受试者中抑制癌细胞的增殖的量。通过考虑因素例如受试者的身材大小和体重、疾病侵入的程度、受试者的年龄、健康和性别、给药途径和给药是局部的还是全身性的,本领域技术人员可容易地确定抑制miR表达的化合物的有效量。
例如,抑制表达的化合物的有效量可基于待治疗的肿瘤块的近似重量。可通过计算团块的近似体积确定肿瘤团块的近似重量,其中1立方厘米的体积大致相当于1克。基于肿瘤团块的重量的有效量可以在大约10-500微克/克的肿瘤块之间,至少大约10微克/克的肿瘤块,至少大约60微克/克的肿瘤团块和至少大约100微克/克的肿瘤块。
抑制miR表达的化合物的有效量也可基于被治疗的受试者的近似或估计的体重。如此处所描述的,除其他以外,通过胃肠外或肠内给药途径施用该有效量。例如,对受试者施用的抑制表达的化合的有效量可在大约5至3000微克/kg的体重,大约700至1000微克/kg的 体重的范围内,或其大于大约1000微克/kg的体重。
本领域技术人员也可容易地确定对给定的受试者施用抑制miR表达的化合物的合适的剂量方案。例如,可对受试者施用抑制表达的化合物一次(例如,作为单次注射或沉积(deposition))。可选择地,可每天1次或2次对受试者施用抑制表达的化合物,进行大约3至大约28天,更特别地大约7至大约10天的时期。在特定的剂量给药方案中,每天1次施用抑制表达的化合物,进行7天。当剂量方案包括多次施用时,要理解对受试者施用的抑制表达的化合物的有效量可包括在整个剂量方案中施用的化合物的总量。
用于抑制miR基因表达的合适的化合物包括双链RNA(例如短的或小的干扰RNA或“siRNA”)、反义核酸和酶RNA分子例如核酶。此类化合物中的各化合物可被靶向给定的miR基因产物和破坏靶miR基因产物或诱导靶miR基因产物的破坏。
例如,可通过用分离的双链RNA(“dsRNA”)分子诱导miR基因的RNA干扰来抑制给定的miR基因的表达,所述双链RNA分子具有与miR基因产物的至少一部分至少90%,例如至少95%、至少98%、至少99%或100%的序列同源性。在特定的实施方案中,dsRNA分子是“短的或小的干扰RNA”或“siRNA”。
用于本方法的siRNA包含长度为大约17个核苷酸至大约29个核苷酸,优选长度为大约19至大约25个核苷酸的短的双链RNA。siRNA包含根据标准的Watson-Crick碱基配对相互作用(以下称“碱基配对”)退火在一起的有义RNA链和互补反义RNA链。有义链包含基本上与靶miR基因产物内包含的核酸序列同一的核酸序列。
如此处所用的,siRNA中与靶mRNA中包含的靶序列“基本上同一”的核酸序列是对靶序列同一或与靶序列相异1个或2个核苷酸的核酸序列。siRNA的有义和反义链可包含两个互补的单链RNA分子,或可包含其中两个互补部分是碱基配对的并且通过单链“发夹结构”区域共价连接的单链分子。
siRNA可以是与天然存在的RNA不同在于一个或多个核苷酸的添 加、缺失、置换和/或改变的改变的RNA。此类改变可包括非核苷酸材料的添加,例如添加至siRNA的末端或添加至siRNA的一个或多个内部核苷酸,或使siRNA对核酸酶降解具有抗性的修饰或用脱氧核糖核苷酸对siRNA中的一个或多个核苷酸的置换。
siRNA的一条或两条链还可包含3′突出端。如此处所用的,“3′突出端”是指从双链RNA链的3′末端延伸的至少一个未配对的核苷酸。因此,在某些实施方案中,siRNA包含长度为1个至大约6个核苷酸(其包括核糖核苷酸或脱氧核糖核苷酸)、长度为1至大约5个核苷酸、长度为1至大约4个核苷酸或长度为大约2至大约4个核苷酸的至少一个3′突出端。在特定的实施方案中,3′突出端存在于siRNA的两条链上,且长度为2个核苷酸。例如,siRNA的各链包含二胸腺嘧啶脱氧核苷酸(dithymidylic acid)(“TT”)或二尿甘酸(“uu”)的3′突出端。
可通过化学或生物学的方法产生siRNA,或如上面关于分离的miR基因产物所描述的,可从重组质粒或病毒载体表达。用于产生和检测dsRNA或siRNA分子的示例性方法描述于属于Gewirtz的美国公开专利申请号2002/0173478和属于Reich等人的美国公开专利申请号2004/0018176,其全部公开内容在此引用作为参考。
还可通过反义核酸来抑制给定的miR基因的表达。如此处所用的,“反义核酸”是指通过RNA-RNA或RNA-DNA或RNA-肽核酸相互作用结合至靶RNA的核酸分子,其可改变靶RNA的活性。适合用于本发明的方法的反义核酸是通常包含与miR基因产物中的连续核酸序列互补的核酸序列的单链核酸(例如,RNA、DNA、RNA-DNA嵌合体、PNA)。反义核酸可包含与miR基因产物中的连续核酸序列50-100%互补、75-100%互补或95-100%互补的核酸序列。表1中提供了miR基因产物的核酸序列。不希望受限于任何理论基础,据认为反义核酸激活RNA酶H或降解miR基因产物/反义核酸双链体的另一种细胞核酸酶。
反义核酸还可包含对核酸主链的修饰或对糖和碱基部分(或其等同物)的修饰以增强靶的特异性、对核酸酶的抗性、与分子的功效相 关的递送或其他性质。此类修饰包括胆固醇部分、双链体插入剂(例如吖啶)或一种或多种抗核酸酶基团。
可通过化学或生物学方法产生反义核酸,或如上面关于分离的miR基因产物所描述的,可从重组质粒或病毒载体表达。用于产生和检测的示例性方法在本领域技术人员的能力范围之内;参见,例如,Stein和Cheng(1993),Science261:1004和美国专利号5,849,902to Woolf等人,其全部公开内容在此引用作为参考。
还可用酶核酸抑制给定的miR基因的表达。如此处所用的,“酶核酸”是指包含具有与miR基因产物的连续核酸序列的互补性的底物结合区的核酸,其能够特异性切割miR基因产物。酶核酸底物结合区可以与miR基因产物中的连续核酸序列具有例如50-100%的互补性、75-100%的互补性或95-100%的互补性。酶核酸还可包含在碱基、糖和/或磷酸基团上的修饰。用于本发明的方法的示例性酶核酸是核酶。
可通过化学或生物学方法产生酶核酸,或如上面关于分离的miR基因产物所描述的,可从重组质粒或病毒载体表达。用于产生和检测dsRNA或siRNA分子的示例性方法描述于Werner和Uhlenbeck(1995),Nucl.Acids Res.23:2092-96;Hammann等人(1999),Antisense and Nucleic Acid Drug Dev.9:25-31;和属于Cech的4,987,071,其全部公开内容在此引用作为参考。
至少一种miR基因产物或至少一种抑制miR表达的化合物的施用将抑制患有与癌症相关性染色体特征相关的癌症的受试者中的癌细胞的增殖。如此处所用的,“抑制癌细胞的增殖”是指杀死细胞或永久性地或临时阻止或减缓细胞的生长。如果在施用miR基因产物或抑制miR基因表达的化合物后,受试者中癌细胞的数目保持恒定或减少,那么可推断此类细胞的增殖被抑制。如果癌细胞的绝对数目增加但肿瘤生长速率减小也可推断癌细胞的增殖被抑制。
可通过直接测量或通过从原发性肿瘤块或转移肿瘤块的大小估计来确定受试者体内的癌细胞的数目。例如,可通过免疫组织学方法、流式细胞计量术或设计用于检测癌细胞的特征性表面标记的其他技术 测量受试者中的癌细胞数目。
可通过直接目视观察或通过诊断性影像学方法例如X射线、磁共振成影像学、超声和闪烁照相术确定肿瘤块的大小。如本领域内已知的,可在造影剂(contrast agent)存在或不存在的情况下使用用于确定肿瘤块的大小的诊断性影像法。还可使用物理方法例如组织块的触诊或使用测量仪器例如测径器测量组织块来确定肿瘤块的大小。
可通过适合将这些化合物递送至受试者的癌细胞的任何方法对受试者施用miR基因产物或抑制miR基因表达的化合物。例如,可通过适合于用这些化合物或用包含编码这些化合物的序列的核酸转染受试者的细胞的方法来施用miR基因产物或抑制miR表达的化合物。在一个实施方案中,用包含编码至少一种miR基因产物或抑制miR基因表达的化合物的序列的质粒或病毒载体转染细胞。
用于真核细胞的转染方法在本领域内是熟知,包括例如核酸至细胞的细胞核或前核的直接注射、电穿孔、脂质体转移或通过亲脂材料介导的转移、受体介导的核酸递送、bioballistic或粒子加速;磷酸钙沉淀和通过病毒载体介导的转染。
例如,可用脂质转移化合物DOTAP(甲基硫酸N-[1-(2,3-二油酰氧)丙基]-N,N,N-三甲基-铵,Boehringer-Mannheim)或等同物例如LIPOFECTIN转染细胞。使用的核酸的量对于本发明的实践不是至关重要的;可用0.1-100微克的核酸/105个细胞获得可接受的结果。例如,可使用每105个细胞大约0.5微克质粒于3微克DOTAP中的比率。
还可通过任何合适的肠内或胃肠外给药途径对受试者施用miR基因产物或抑制miR基因表达的化合物。用于本方法的合适的肠内给药途径包括例如口服、直肠或鼻内递送。合适的胃肠外给药途径包括例如血管内给药(例如,至脉管系统的静脉内快速注射、静脉输注、动脉内快速浓注、动脉内输注和导管滴注);组织外周和组织内注射(例如,瘤周和瘤内注射、视网膜内注射或视网膜下注射);皮下注射或沉积,包括皮下输注(例如通过渗透泵);对目的组织的直接施用,例如通过导管或其他安置装置(例如,视网膜弹丸剂或栓剂或包含多孔、无孔 或凝胶状材料的植入体);以及吸入。特别适合的给药途径是注射、输注和直接至肿瘤的注射。
在本方法中,可将miR基因产物或抑制miR基因产物的表达的化合物作为裸RNA与递送试剂一起或作为核酸(例如,重组质粒或病毒载体)给受试者施用,所述核酸包含表达miR基因产物或抑制表达的化合物的序列。合适的递送试剂包括例如Mirus Transit TKO亲脂试剂、lipofectin、lipofectamine、cellfectin、聚阳离子(例如,多聚赖氨酸)和脂质体。
此处描述了包含表达miR基因产物或抑制miR基因产物表达的化合物的序列的重组质粒和病毒载体以及用于递送此类质粒和载体至癌细胞的技术。
在特定的实施方案中,脂质体用于将miR基因产物或抑制miR基因表达的化合物(或包含编码它们的核酸)递送至受试者。脂质体也可以增加基因产物或核酸的血液半衰期。可从标准的形成小囊泡的脂质(其通常包含中性或带负电荷的磷脂和固醇例如胆固醇)形成用于本发明的合适的脂质体。通常通过考虑因素例如想要的脂质体大小和血流中脂质体的半衰期来指导脂质的选择。用于制备脂质的许多方法,例如,如在Szoka等人(1980),Ann.Rev.Biophys.Bioeng.9:467;和美国专利号4,235,871、4,501,728、4,837,028和5,019,369(其全部公开内容在此引用作为参考)中描述的方法是已知的。
用于本方法的脂质体可包含将脂质体靶向癌细胞的配体分子。结合癌细胞中普遍存在的受体的配体例如结合肿瘤抗原的单克隆抗体是优选的。
还可对用于本方法的脂质体进行修饰以避免被单核巨噬细胞系统(“MMS”)和网状内皮系统(“RES”)清除。此类经修饰的脂质体具有存在于表面上或整合入脂质体结构中的调理作用抑制性部分(opsonization-inhibition moiety)。在特别优选实施方案中,本发明的脂质体可同时包含调理作用抑制性部分和配体。
用于制备本发明的脂质体的调理作用抑制性部分通常是结合至脂 质体的膜的大的亲水聚合物。如此处所用的,当其例如通过脂溶性锚嵌入膜本身中或通过对膜脂质的活性基团直接结合而被化学地或物理地附着至膜时,调理作用抑制性部分“结合”至脂质体膜。这些调理作用抑制性亲脂聚合物形成了显著减少脂质体被MMS和RES吸收的保护表面层;例如,如美国专利号No.4,920,016中所描述的,其全部公开内容在此引用作为参考。
适合用于修饰脂质体的调理作用抑制性部分优选是具有大约500至大约40,000道尔顿和优选大约2,000至大约20,000道尔顿的数量平均分子量的水溶性聚合物。此类聚合物包括聚乙二醇(PEG)或聚丙二醇(PPG)的衍生物;例如甲氧基PEG或PPG,和PEG或PPG硬脂酸酯;合成聚合物,例如聚丙烯酰胺或聚N-乙烯基吡咯酮;线性的、分支的或树状聚酰胺-胺(polyamidoamines);聚丙烯酸;多元醇,例如羧基或氨基化学连接至其的聚乙烯醇和聚木糖醇,以及神经节苷脂例如神经节苷脂GM1。PEG、甲氧基PEG或甲氧基PPG或其衍生物的共聚物也是合适的。此外,调理作用抑制性聚合物可以是PEG与多聚氨基酸、多糖、聚酰胺-胺、聚乙烯胺或多核苷酸的嵌段共聚物。调理作用抑制性聚合物也可以是包含氨基酸或羧酸例如半乳糖醛酸、葡糖醛酸、甘露糖醛酸、透明质酸、果胶酸、神经氨酸、海藻酸、角叉菜胶的天然多糖;氨化多糖或寡糖(线性或分支的);或羧化多糖或低聚糖,例如与碳酸的衍生物反应,获得羧基的连接。优选,调理作用抑制性部分是PEG、PPG或其衍生物。用PEG或PEG衍生物修饰的脂质体有时称为“PEG化脂质体”。
可通过许多熟知的技术中的任一种将调理作用抑制性部分与脂质体膜结合。例如,可将PEG的N-羟基琥珀酰亚胺酯结合至磷脂酰乙醇胺脂溶性锚,然后再将其结合至膜。类似地,可使用Na(CN)BH3和溶剂混合物(例如以30∶12比例的四氢呋喃和水)在60℃下通过还原氨化作用用硬脂酰胺脂溶性锚衍生葡聚糖聚合物。
用调理作用抑制性部分修饰的脂质体在循环中比未修饰的脂质体保持长得多的时间。因此,这样的脂质体有时称为“秘密(stealth)” 脂质体。已知秘密脂质体在由多孔的或“渗漏的”微血管滋养的组织中积累。因此,特征在于该微血管缺陷的组织例如实体瘤将有效率地积累这些脂质体;参见Gabizon,等人(1988),Proc.Natl.Acad.Sci.,U.S.A.,18:6949-53。此外,减少的由RES进行的吸收通过防止脂质体在肝和脾中大量积累而降低了秘密脂质体的毒性。因此,用调理作用抑制性部分修饰的脂质体特别适合将miR基因产物或抑制miR基因表达的化合物(或包含编码它们的序列的核酸)递送至肿瘤细胞。
按照本领域内已知的技术在给受试者施用之前,可将miR基因产物或miR基因表达抑制性化合物配制为药物组合物,有时称为“药物”。因此,本发明包括用于治疗乳腺癌的药物组合物。在一个实施方案中,药物组合物包含至少一种分离的miR基因产物和药学上可接受的载体。在特定实施方案中,至少一种miR基因产物相应于这样的miR基因产物,即该miR基因产物相对于合适的对照细胞,在乳腺癌细胞中具有减少的表达水平。在某些实施方案中,分离的miR基因产物选自miR-145、miR-10b、miR-123(miR-126)、miR-140-as、miR-125a、miR-125b-1、miR-125b-2、miR-194、miR-204、let-7a-2、let-7a-3、let-7d(let-7d-v1)、let-7f-2、miR-101-1、miR-143和其组合。
在其他实施方案中,本发明的药物组合物包含至少一种miR表达抑制化合物。在特定的实施方案中,该至少一种miR基因表达抑制性化合物对于其表达在乳腺癌细胞中比在对照细胞中强的miR基因是特异性的。在某些实施方案中,miR基因表达抑制性化合物对于一种或多种选自miR-21、miR-155、miR-009-1(miR131-1)、miR-34(miR-170)、miR-102(miR-29b)、miR-213、let-7i(let-7d-v2)、miR-122a、miR-128b、miR-136、miR-149、miR-191、miR-196-1、miR-196-2、miR-202、miR-203、miR-206、miR-210、miR-213和其组合的miR基因产物是特异性的。
本发明的药物组合物的特征在于是至少无菌的和无热原的。如此处所用的,“药物制剂”包括用于人和兽医用途的制剂。用于制备本 发明的药物组合物的方法在本领域技术人员的能力范围之内,例如,如Remington′s Pharmaceutical Science,第17版,Mack Publishing Company,Easton,Pa.(1985)中所描述的,其全部公开内容在此引用作为参考。
本药物制剂包含与药学上可接受的载体混合的至少一种miR基因产物或miR基因表达抑制性化合物(或至少一种包含编码它们的序列的核酸)(例如,按重量计算0.1至90%),或其生理上可接受的盐。本发明的药物制剂还可包含由脂质体封装的至少一种miR基因产物或miR基因表达抑制性化合物(或至少一种包含编码它们的序列的核酸)和药学上可接受的载体。在一个实施方案中,药物组合物包含miR基因或基因产物,所述基因或基因产物不是miR-15、miR-16、miR-143和/或miR-145。
特别合适的药学上可接受的载体是水、缓冲水溶液、生理盐水、0.4%的盐水、0.3%甘氨酸、透明质酸等。
在特定实施方案中,本发明的药物组合物包含对核酸酶产生的降解具有抗性的至少一种miR基因产物或miR基因表达抑制性化合物(或至少一种包含编码它们的序列的核酸)。本领域技术人员可容易地合成对核酸酶具有抗性的核酸,例如通过将一个或多个在2’位置被修饰的核糖核苷酸掺入miR基因产物。合适的2’-修饰的核糖核苷酸包括在2’位置用氟、氨基、烷基、烷氧基和O-烯丙基修饰的核糖核苷酸。
本发明的药物组合物还可包含常规药物赋形剂和/或添加剂。合适的药物赋形剂包括稳定剂、抗氧化剂、渗透压调节剂(osmolality adjusting agent)、缓冲剂和pH调节剂。合适的添加剂包括例如生理生物相容性缓冲剂(例如,盐酸氨丁三醇(tromethamine hydrochloride))、螯合剂(例如,DTPA或DTPA-双酰胺)或钙螯合物(例如,DTPA钙、CaNaDTPA-双酰胺)的加入,或任意地,钙或钠盐(例如,氯化钙、抗坏血酸钙、葡萄糖酸钙或乳酸钙)的加入。可包装本发明的药物组合物以使以液体形式使用或可将其冻干。
对于本发明的固体药物组合物,可使用常规的无毒性固体药学上可接受的载体例如药物级的甘露醇、乳糖、淀粉、硬脂酸镁、糖精钠、滑石粉、纤维素、葡萄糖、蔗糖、碳酸镁等。
例如,用于口服给药的固体药物组合物可包含上列的任何载体和赋形剂和10-95%,优选25%-75%的至少一种miR基因产物或miR基因表达抑制性化合物(或至少一种包含编码它们的序列的核酸)。用于烟雾剂(吸入)给药的药物组合物可包含封装在上述脂质体中的按重量计算0.01-20%,优选按重量计算1%-10%的至少一种miR基因产物或miR基因表达抑制性化合物(或至少一种包含编码它们的序列的核酸)和喷射剂。当需要时也可包含载体;例如用于鼻内给药的卵磷脂。
本发明还包括鉴定抗乳腺癌试剂的方法,其包括对细胞提供受试试剂和测量至少一种miR基因产物在细胞中的水平。在一个实施方案中,所述方法包括对细胞提供受试试剂和测量至少一种与乳腺癌细胞中减少的表达水平相关的miR基因产物的水平。相对于合适的对照细胞,细胞中miR基因产物的水平的增加表明受试试剂为抗乳腺癌试剂。在特定的实施方案中,至少一种与乳腺癌细胞中减少的表达水平相关的miR基因产物选自miR-145、miR-10b、miR-123(miR-126)、miR-140-as、miR-125a、miR-125b-1、miR-125b-2、miR-194、miR-204、let-7a-2、let-7a-3、let-7d(let-7d-v1)、let-7f-2、miR-101-1、miR-143和其组合。
在另一个实施方案中,所述方法包括对细胞提供受试试剂和测量至少一种与乳腺癌细胞中增加的表达水平相关的miR基因产物的水平。相对于合适的对照细胞,细胞中miR基因产物的水平的降低表明受试试剂为抗乳腺癌试剂。在特定的实施方案中,至少一种与乳腺癌细胞中增加的表达水平相关的miR基因产物选自miR-21、miR-155、miR-009-1(miR131-1)、miR-34(miR-170)、miR-102(miR-29b)、miR-213、let-7i(let-7d-v2)、miR-122a、miR-128b、miR-136、miR-149、miR-191、miR-196-1、miR-196-2、miR-202、miR-203、miR-206、miR-210、miR-213和其组合。
合适的试剂包括但不限于药物(例如,小分子、肽),和生物大分子(例如,蛋白质、核酸)。可通过重组、合成方法产生该试剂,或其可从天然来源分离(即,纯化)。用于对细胞提此类试剂的各种方法(例如,转染)在本领域内是熟知的,上文中描述了几种这样的方法。用于检测至少一种miR基因产物的方法(例如,Northern印迹法、原位杂交法、RT-PCR、表达谱分析)在本领域内也是熟知的。上文中也描述了这些方法中的几种方法。
现在通过下列非限定性实施例举例说明本发明。
实施例1:区分乳腺癌组织和正常组织的microRNA表达特征谱的鉴定。
材料和方法
乳腺癌样品和细胞系。来自原发性肿瘤的RNA获自在University of Ferrara(Italy),Istituto Nazionale dei Tumori,Milano(Italy)和Thomas Jefferson University(Philadelphia,PA)收集的76个样品。可获得58个肿瘤样品的临床病理信息。来自正常样品的RNA由6个RNA混合物(pool)(各来自5个正常的乳腺组织)以及来自4个另外的单个乳腺组织的RNA组成。也从下列细胞系:Hs578-T、MCF7、T47D、BT20、SK-BR-3、HBL100、HCC2218、MDA-MB-175、MDA-MB-231、MDA-MB-361、MDA-MB-435、MDA-MB-436、MDA-MB-453和MDAMB-468获得乳腺癌RNA。
miRNA微阵列。按照厂商说明书使用Trizol试剂(Invitrogen)进行总RNA分离。如前面所述(Liu,C.-G.,等人,Proc.Natl.Acad.Sci.U.S.A.101:9740-9744(2004))在microRNA微阵列芯片上进行RNA标记和杂交。简而言之,在使用随机六聚物的反转录过程中用生 物素标记5μg来自各样品的RNA。在miRNA微阵列芯片上以一式三份进行杂交(KCI版本1.0)(Liu,C.-G.,等人,Proc.Natl.Acad.Sci.U.S.A.101:9740-9744(2004)),该芯片包含368个探针,包含245个人和小鼠miRNA基因。使用Perkin-Elmer ScanArray XL5K通过生物素对链霉抗生物素-Alexa647缀合物的结合检测杂交信号。用Quantarray软件(Perkin Elmer)定量扫描图像。
微阵列数据的统计学和生物信息学分析。使用 软件,版本7.2(SiliconGenetics,Redwood City,CA)标准化和分析原始数据。将表达数据以中位数集中。使用ANOVA(方差分析)进行统计比较,使用Benjamini和Hochberg校正以减少假阳性。使用PAM软件(Prediction Analysis of Microarrays,可在http://www.stat.stanford.edu/~tibs/PAM/index.html获得)(Tibshirani,R.,等人Proc.Natl.Acad.Sci.U.S.A.99:6567-6572(2002))和Support Vector Machine(Furey,T.S.,等人Bioinformatics 16:906-914(2000))软件确定用于肿瘤或正常类型预测的预后miRNA。两种算法都用于交叉验证和Test-set预测。使用MIAMExpress将所有数据提交给Array Express数据库(修正后可收到注册号)。
Northern印迹分析。如之前所述(Calin,G.A.,等人,Proc.Natl.Acad.Sci.U.S.A.99:15524-29(2002))进行Northern印迹分析。在15%丙烯酰胺、7M尿素Criterion预制凝胶(Bio-Rad)上对RNA样品(各10μg)进行电泳,然后转移至Hybond-N+膜(Amersham Pharmacia Biotech)上。在37℃下在7%十二烷基硫酸钠(SDS)/0.2MNa2PO4(pH 7.0)中杂交,进行16小时。在42℃下用补充以1mM EDTA(SSPE)和0.1%SDS的2x标准磷酸缓冲盐溶液(0.18M NaCl/10mM磷酸,pH 7.4)洗涤膜2次,然后用0.5X SSPE/0.1%SDS洗涤2次。寡核苷酸探针与相应的成熟的microRNA(参见 http://www.sanger.ac.uk/Software/Rfam/mirna/上的miR注册):miR-215’-TCA ACA TCA GTC TGA TAA GCT A-3’(SEQ ID NO:287)、miR-125b1:5’-TCA CAA GTT AGG GTC TCA GGG A-3’(SEQ ID NO:288)、miR-145:5’-AAG GGA TTC CTG GGA AAA CTG GAC-3’(SEQ ID NO:289)的序列互补。与U 6RNA(5’-GCA GGG GCC ATG CTA ATC TTC TCT GTA TCG-3’(SEQ ID NO:290))互补的寡核苷酸用于标准化表达水平。使用多核苷酸激酶(Roche)用100mCi[γ-32P]-ATP末端标记200ng各探针。在再杂交之前在煮沸的0.1%SDS溶液中剥离Northern印迹,进行10分钟。
结果
使用microRNA微阵列(Liu,C.-G.,等人,Proc.Natl.Acad.Sci.U.S.A.101:9740-9744(2004))产生10个正常乳腺组织和76个肿瘤性乳腺组织的microRNA表达谱。各肿瘤组织来源于单个样品,而10个正常样品中有6个由从5个不同的正常乳腺组织制备的RNA的混合物组成。因此,实际上在研究中检查了34个正常乳腺样品。
为鉴定在正常和肿瘤样品之间差异表达的,从而可用于区分正常乳腺组织和癌性乳腺组织的miRNA,使用方差分析和类型预测统计工具。对标准化的数据的ANOVA分析的结果产生了正常乳腺组织和癌性乳腺组织之间的差异表达(p<0.05)的miRNA谱(表2)。基于差异表达的miRNA的聚类分析产生了在正常组织和癌症组织之间具有明显差异的树(图1A)。
为准确鉴定能够区分正常乳腺组织和乳腺癌组织的一套预兆性miRNA,我们使用Support Vector Machine(GeneSpring软件)和PAM(微阵列的预测分析(Prediction Analysis of Microarrays))(http://wwwstat.stanford.edu/~tibs/)。来自两类预测分析的结果大部分相同(表3和图1B)。在列于表3中的miRNA中,15个中有11个具有小于0.05的ANOVA p值。为了确证通过微阵列分析获得的结果,我们进行Northern印迹分析以估量一小组在正常组织和乳腺癌 组织中差异表达的microRNA即mir-125b、mir-145和mir-21的表达水平。Northern印迹分析确认了由微阵列分析获得的结果。在许多情况下,显示的表达差异比通过微阵列研究所预期的表达差异更强(图1C)。
表2.乳腺癌和正常乳腺之间差异表达的miRNA
表3.正常和肿瘤乳腺组织类型预测者microRNA
a-如表2中计算的方差分析(Genespring软件包中的Welch t检验)。
b-Support Vector Machine预测分析工具(来自Genespring 7.2软件包)。预测强度计算为在两个类型之一中偶然预测观察到的样品数目的概率负自然对数。评分越高,预测强度越好。
c-两类微阵列的预测分析的质心评分(Centroid score)(Tibshirani,R.,等人Proc.Natl.Acad.Sci.U.S.A.99:6567-6572(2002))。
根据微阵列分析其表达显著(p<0.05)失去控制的29种miRNA中,一组1 5种miRNA能够以100%的准确度正确地预测分析的样品的性质(即,正常对肿瘤)。在差异表达的miRNA中,miR-10b、miR-125b、miR145、miR-21和miR-155是乳腺癌样品中最一致摆脱控制的miRNA。这些miRNA中的三种即miR-10b、miR-125b和miR-145被下调,而其余两种miR-21和miR-155被上调,这表明它们可能分别充当肿瘤抑制基因或癌基因。
实施例2:在乳腺癌组织中被失去控制的miRNA的推定的基因靶 的确定。
目前,关于bona fide miRNA基因靶的知识的缺乏阻碍了对在特征在于异常的miRNA表达的癌症中摆脱控制的生物学功能的全面理解。为了鉴定根据我们的研究最显著地摆脱控制的miRNA:miR-10b、miR125b、miR-145、miR-21和miR-155的推定靶(参实施例1),我们使用多种计算方法。特别地,使用三种普遍用于预测miRNA基因的靶的miRanda、TargetScan和PicTar算法(Enright,A.J.,等人Genome Biol.5:R1(2003);Lewis,B.P.等人,Cell 115.:787-798(2003);Krek,A.,等人,Nat.Genet.37:495-500(2005))进行分析。使用三种算法中的各算法获得的结果相互之间交叉参考以验证推定的靶并且只有被3种算法中的至少2种鉴定的靶才被认可。该分析结果示于表4。
具有潜在的癌基因功能的几个基因被鉴定为在乳腺癌样品中下调的miRNA的推定靶。值得注意的是,癌基因被鉴定为miR-10b(例如,FLT1,v-crk同源物、生长因子BDNF和转导因子SHC1)、miR-125b(例如,YES、ETS1、TEL、AKT3,生长因子受体FGFR2和促分裂原活化的信号转导途径的成员VTS58635、MAP3K10、MAP3K11、MAPK14)和miR-145(例如,MYCN、FOS、YES和FLI1,弗罗德白血病病毒的整合位点、细胞周期启动子例如细胞周期蛋白D2和L1、MAPK转导蛋白例如MAP3K3和MAP4K4)的靶。原癌基因YES和核心结合转录因子CBFB被确定为miR-125和miR-145的可能的靶。
与些发现一致的是,多个肿瘤抑制基因被鉴定为miR-21和miR-155(在乳腺癌细胞中上调的miRNA)的靶。对于miR-21,所有三个方法都预测TGFB基因为靶。对于miR-155,可能的靶包括肿瘤抑制基因SOCS1和APC以及激酶WEE1(其阻断Cdc2的活性并阻止进入有丝分裂)。低氧诱导因子HIF1A也是miR-155的预测的靶。值得注意的是,包含基元的蛋白TRIM2、原癌基因SKI以及RAS同源物RAB6A和RAB6C发现为miR-21和miR-155的可能的靶。
实施例3:生物病理学特征和microRNA表达
材料和方法
乳腺癌样品的免疫组织化学分析。
如所描述的(Querzoli,P.,等人,Anal.Quant.Cytol.Histol.21:151-160(1999))进行染色方法。用针对雌激素受体α(ER)的6F11抗体和针对孕酮受体(PR)的PGR-1A6抗体(Ventana,Tucson,AZ,U.S.A.)评估激素受体。使用MIB1抗体(DAKO,Copenhagen)估量增殖指数。使用CB11抗体(Ventana,Tucson,AZ,U.S.A.)检测ERBB2和使用DO7抗体(Ventana,Tucson,AZ,U.S.A.)检查p53蛋白的表达。只有具有对于ER、PR、Mib1和p53的明显的细胞核免疫染色的肿瘤细胞被记录为阳性的。当肿瘤细胞显示明显的膜免疫反应性时,认为它们对于ERBB2是阳性的。
为进行这些不同的生物学标记表达的定量分析,使用Eureka Menarini计算机化图象分析系统。对于各肿瘤切片,使用40x物镜测量至少20个浸润性癌的显微镜下视野。使用下列截断值:对于ER、PR、c-erbB2和p53而言10%的阳性细胞核区域,引入13%的表达Mib1的细胞核以区分高增殖活性和低增殖活性的情况。
结果
为评估与乳腺癌相关的各种生物病理学特征与特定miRNA的表达之间是否存在相关性,我们产生和比较了与特定乳腺癌特征的存在或不存在相关的各种癌症样品的miRNA表达谱。特别地,我们分析了具有小叶或导管组织学类型的乳腺癌、具有雌激素受体α(ER)或孕酮受体的差异表达的乳腺癌和在淋巴结转移、血管侵袭、增殖指数和ERBB2及p53的表达上具有差异的乳腺癌。
小叶或导管和+/-ERBB2表达类型的表达谱不显示任何差异表达的microRNA,而所有其他比较均显示了少量差异表达的microRNA(P<0.05)。未分析肿瘤级别。该分析的结果示于图4中。
鉴定了与人乳腺癌相关的各种生物病理特征的差异表达的miRNA家族。例如,在ER-和PR-肿瘤中所有miR-30miRNA都下调,这表明miR-30miRNA的表达受到这些激素的调节。此外,在具有淋巴节转移或高增殖指数的乳腺癌样品中各种let-7miRNA的表达下调,这表明 减少的let-7表达可与不良预后相关,该结果与之前的发现一致(Takamizawa,J.,等人,Cancer Res.39:167-169(2004))。miRNA的let-7家族调节RAS癌基因家族成员的表达的发现提供了let-7miRNA在人癌症中的作用的可能解释(Johnson,S.M.,等人,Cell120:635-647(2005))。
miR-145和miR-21(其表达可区分癌组织或正常组织的两种miRNA)在具有不同增殖指数或不同肿瘤期的癌症中也差异表达。特别地,miR-145从正常乳腺至具有高增殖指数的癌症中渐进下调。类似地,从正常乳腺至具有高肿瘤期的癌症,miR-21渐近上调。这些发现表明这两种miRNA的脱调控可能影响了参与肿瘤进展的至关重要的分子事件。
另一种可能参与癌进程的miRNA是miR-9-3。在具有高度血管侵袭或淋巴节转移的乳腺癌中miR-9-3被下调,这表明在肿瘤进展的过程中特别是获得转移潜能的过程中需要其下调。
未明确在此引用的此处引述的所有出版物的相关教导以其全文在此引用作为参考。尽管参考其优选实施方案已明确地地显示和描述了本发明,但本领域技术人员将理解其中可进行形式和细节上的不同变化而不背离所附权利要求包括的本发明的范围。
Claims (9)
1.miRNA特异性探针寡核苷酸在制备诊断剂中的用途,所述诊断剂用于通过测量来自受试者的受试样品中的至少一种miR基因产物的水平来诊断所述受试者是否具有乳腺癌或处于发生乳腺癌的风险中,其中相对于对照样品中的相应miR基因产物的水平,受试样品中的miR基因产物水平的改变表明受试者具有乳腺癌或处于发生乳腺癌的风险中,其中所述至少一种miR基因产物为miR-145。
2.权利要求1的用途,其中使用Northern印迹分析法测量所述至少一种miR基因产物的水平。
3.miRNA特异性探针寡核苷酸在制备诊断剂中的用途,所述诊断剂用于通过测量来自受试者的乳腺癌样品中至少一种miR基因产物的水平来诊断所述受试者中与一种或多种预后标记相关的乳腺癌,其中相对于对照样品中相应miR基因产物的水平,受试样品中所述至少一种miR基因产物的水平的改变表明受试者患有与所述一种或多种预后标记相关的乳腺癌,
其中,所述乳腺癌与高增殖指数相关,且所述miR基因产物为miR-145。
4.miRNA特异性探针寡核苷酸在制备微阵列中的用途,所述微阵列用于通过如下步骤诊断受试者是否具有乳腺癌或处于发生乳腺癌的风险中,所述步骤包括:
(1)从获自受试者的受试样品反转录RNA以提供一组靶寡聚脱氧核苷酸;
(2)使靶寡聚脱氧核苷酸与包含miRNA特异性探针寡核苷酸的微阵列杂交以提供受试样品的杂交谱;和
(3)将受试样品的杂交谱与从对照样品产生的杂交谱进行比较,
其中至少一种miRNA的信号的改变表明受试者具有乳腺癌或处于发生乳腺癌的风险中,并且
其中所述微阵列包含至少一种miRNA的miRNA特异性探针寡核苷酸,所述至少一种miRNA包括miR-145。
5.权利要求4的用途,其中相对于从对照样品产生的信号,至少一种miRNA的信号被下调。
6.权利要求4的用途,其中微阵列还包含一种或多种选自miR-21、miR-155、miR-10b、miR-009-1(miR131-1)、miR-34(miR-170)、miR-102(miR-29b)、miR-123(miR-126)、miR-140-as、miR-125a、miR-125b-1、miR-125b-2、miR-194、miR-204、miR-213、let-7a-2、let-7a-3、let-7d(let-7d-v1)、let-7f-2、let-7i(let-7d-v2)、miR-101-1、miR-122a、miR-128b、miR-136、miR-143、miR-149、miR-191、miR-196-1、miR-196-2、miR-202、miR-203、miR-206、miR-210和其组合的miRNA的miRNA特异性探针寡核苷酸。
7.miRNA特异性探针寡核苷酸在制备微阵列中的用途,所述微阵列用于通过如下步骤诊断受试者是否具有与受试者中一种或多种不利预后标记相关的乳腺癌或处于发生这种乳腺癌的风险中,所述步骤包括:
(1)从获自受试者的受试样品反转录RNA以提供一组靶寡聚脱氧核苷酸;
(2)使靶寡聚脱氧核苷酸与包含miRNA特异性探针寡核苷酸的微阵列杂交以提供所述受试样品的杂交谱;和
(3)将受试样品的杂交谱与从对照样品产生的杂交谱进行比较,
其中信号的改变表明受试者具有与一种或多种不利预后标记相关的乳腺癌或处于发生这种乳腺癌的风险中,并且
其中所述微阵列包含至少一种miRNA的miRNA特异性探针寡核苷酸,所述至少一种miRNA包括miR-145。
8.权利要求7的用途,其中所述一种或多种不利的预后标记选自雌激素受体的表达、孕酮受体的表达、阳性淋巴节转移、高增殖指数、可检测的p53的表达、晚期肿瘤期和高血管侵袭。
9.权利要求7的用途,其中微阵列还包含选自miR-26a、miR-26b、miR-102(miR-29b)、miR-30a-5p、miR-30b、miR-30c、miR-30d、miR-185、miR-191、miR-206、miR-212、let-7c、miR-9-2、miR-15-a、miR-21、miR-30a-s、miR-133a-1、miR-137、miR-153-2、miR-154、miR-181a、miR-203、miR-213、let-7f-1、let-7a-3、let-7a-2、miR-9-3、miR-10b、miR-27a、miR-29a、miR-123、miR-205、let-7d、miR-16a、miR-128b和其组合的miRNA的至少一种miRNA特异性探针寡核苷酸。
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JP2009505639A (ja) | 2009-02-12 |
CN103820562A (zh) | 2014-05-28 |
CN103866018A (zh) | 2014-06-18 |
US20160251659A1 (en) | 2016-09-01 |
CN101341259B (zh) | 2011-12-21 |
US20080261908A1 (en) | 2008-10-23 |
WO2007016548A3 (en) | 2007-08-30 |
EP1937845B1 (en) | 2015-06-10 |
JP2013230161A (ja) | 2013-11-14 |
CA2617581A1 (en) | 2007-02-08 |
EP1937845A4 (en) | 2009-11-18 |
JP5489459B2 (ja) | 2014-05-14 |
WO2007016548A2 (en) | 2007-02-08 |
CN103866017B (zh) | 2016-05-25 |
CN102533966A (zh) | 2012-07-04 |
US8658370B2 (en) | 2014-02-25 |
US20140147495A1 (en) | 2014-05-29 |
ES2545383T3 (es) | 2015-09-10 |
CN103882124A (zh) | 2014-06-25 |
CN103866018B (zh) | 2016-05-25 |
JP2013116114A (ja) | 2013-06-13 |
CN101341259A (zh) | 2009-01-07 |
CN103866017A (zh) | 2014-06-18 |
CN103820562B (zh) | 2015-05-13 |
CN103882124B (zh) | 2015-11-18 |
CN105902559A (zh) | 2016-08-31 |
EP1937845A2 (en) | 2008-07-02 |
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