CN110398584B - 血清Slit2作为结直肠癌诊治和转移监测标志物的应用 - Google Patents

血清Slit2作为结直肠癌诊治和转移监测标志物的应用 Download PDF

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CN110398584B
CN110398584B CN201910436470.5A CN201910436470A CN110398584B CN 110398584 B CN110398584 B CN 110398584B CN 201910436470 A CN201910436470 A CN 201910436470A CN 110398584 B CN110398584 B CN 110398584B
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章倩倩
王丽京
姚玉莹
李留有
周子钧
段有发
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Guangdong Pharmaceutical University
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Abstract

本发明公开了血清Slit2作为结直肠癌诊治和转移监测标志物的应用。本发明首次证实了血清Slit2在结直肠癌患者血清中表达水平显著升高,利用血清Slit2可有效的区分结直肠癌患者和健康人,特异性阻断Slit2/Robo1信号可以抑制结直肠癌的生长、增殖和转移。因此,本发明提供了一种新的结直肠癌诊断、转移监测和治疗标志物,即血清Slit2,该标志物对结直肠癌患者具有良好的早期诊断、转移监测和早期治疗作用,灵敏度高、特异性强,在临床诊断结直肠癌中具有良好的应用前景和广阔的发展空间。

Description

血清Slit2作为结直肠癌诊治和转移监测标志物的应用
技术领域
本发明属于生物医药技术领域,更具体地,涉及血清Slit2作为结直肠癌诊治和转移监测标志物的应用。
背景技术
结直肠癌(CRC)是常见的消化道恶性肿瘤,其致死率位于癌症死亡的第二位。近年来,随着人民生活水平的提高,生活方式和饮食结构改变,导致结直肠癌发生率逐年升高,且有年轻化趋势。结直肠癌患者预后与肿瘤临床分期密切相关,早期治疗结直肠癌后五年生存率达60%,但实际上,由于大多数患者在肿瘤早期鲜有明显症状,待首诊时即为中晚期,错过了最佳治疗时期。
目前,对于结直肠癌的临床诊断主要通过肠镜检查。随着医疗水平的发展,利用肿瘤标志物进行疾病的早期检测,已成为医学研究和临床诊断的热点。例如,检测血清CA199和癌胚抗原(CEA)水平,对于结直肠癌的早期诊断具有重要的临床价值。CA199是一种低聚糖肿瘤相关糖类抗原,在消化道恶性肿瘤中特异性高,一旦检测结果呈阳性,对于结直肠癌的诊断具有重要的临床指导意义,但其敏感性不如CEA高;CEA增高的结直肠癌患者常发生转移且预后差,但对于早期结直肠癌病人不敏感。理想的标志物应具有较高敏感性,在肿瘤早期即可提示诊断、易检测的特点。因此,进一步探索结直肠癌的血清学诊断标志物,从而减少结直肠癌的漏诊,提高结直肠癌的检测准确性,对结直肠癌的早期治疗和改善患者预后具有重要临床意义。
目前,虽然临床已有结直肠癌早期诊断的标志物,但是对早期结直肠癌病人不敏感性。因此,寻找新的、敏感性更高的结直肠癌诊断标志物,对于结直肠癌患者的早期诊断、转移监测和治疗有着更加广阔的应用前景。
发明内容
本发明要解决的技术问题是克服现有结直肠癌诊断标志物对早期结直肠癌病人不敏感性的问题,提供一种新的、敏感性更高的结直肠癌诊断标志物,为结直肠癌的诊断、转移监测和治疗提供新的靶点,对早期诊断结直肠癌具有重要的指导意义。
本发明的第一个目的是提供血清Slit2作为结直肠癌诊断标志物的应用。
本发明的第二个目的是提供血清Slit2的检测试剂在制备结直肠癌诊断试剂盒和/或制剂方面的应用。
本发明的第三个目的是提供血清Slit2作为结直肠癌转移监测标志物的应用。
本发明的第四个目的是提供血清Slit2的检测试剂在制备结直肠癌远处转移监测试剂盒和/或制剂方面的应用。
本发明的第五个目的是提供血清Slit2作为结直肠癌治疗靶点方面的应用。
本发明的第六个目的是提供血清Slit2在制备结直肠癌治疗试剂或药物方面的应用。
本发明的第七个目的是提供一种结直肠癌诊断试剂盒。
本发明上述目的通过以下技术方案实现:
具体地,本发明研究了结直肠癌发展病理进程中血清Slit2含量,发现结直肠癌患者血清Slit2含量高于健康志愿者,差异十分显著(P<0.001);随着病理进程的发展,血清Slit2含量逐渐升高;利用血清Slit2可有效的区分结直肠癌患者和健康人。
此外,本发明利用ROC曲线分析了血清Slit2在结直肠癌中的诊断作用,发现血清Slit2可作为结直肠癌的诊断标志物,AUC为0.92,灵敏度和特异性分别为78.6%和92.9%,具有灵敏度高、特异性强的特点,表明血清Slit2对临床诊断结直肠癌具有良好的应用价值。
因此,以下应用均应在本发明的保护范围之内:
血清Slit2作为结直肠癌诊断标志物的应用,以及血清Slit2的检测试剂在制备结直肠癌诊断试剂盒和/或制剂方面的应用。
血清Slit2作为结直肠癌转移监测标志物的应用,以及血清Slit2的检测试剂在制备结直肠癌远处转移监测试剂盒和/或制剂方面的应用。
血清Slit2作为结直肠癌治疗靶点方面的应用,以及血清Slit2在制备结直肠癌治疗试剂或药物方面的应用。
所述血清Slit2的氨基酸序列如SEQ ID NO.1所示。
所述血清Slit2的核苷酸序列如SEQ ID NO.2所示。
优选地,所述药物是能够抑制结直肠癌细胞的生长、增殖和/或转移的药物。
优选地,所述抑制剂为Slit2/Robo1信号抑制剂。
优选地,所述血清为外周血血清。
另外,本发明还请求保护一种结直肠癌诊断试剂盒,所述试剂盒包含血清Slit2的检测试剂。
所述试剂盒能检测血清Slit2表达水平,表达水平异常升高,则患有结直肠癌。
与现有技术相比,本发明具有以下有益效果:
本发明提供了一种新的结直肠癌诊断标志物,即血清Slit2,首次证实了血清Slit2在结直肠癌患者血清中表达水平显著升高,利用血清Slit2可有效的区分结直肠癌患者和健康人。另外,本发明利用ROC曲线分析,发现血清Slit2表达水平对结直肠癌患者的灵敏度和特异性分别为78.6%和92.9%。因此,血清Slit2可以作为结直肠癌诊断、远处转移监测和治疗的标志物,具有灵敏度高、特异性强的特点,对临床诊断结直肠癌具有指导意义和良好的实际应用价值。
附图说明
图1是小鼠肿瘤发展病理进程中肠道组织结构变化H&E染色的结果图。
图2是小鼠肿瘤发展病理进程中血清Slit2含量的检测结果图;其中,n=10、14、16分别代表供试小鼠为10只、14只和16只,“***”代表P<0.001,“*”代表P<0.05。
图3是ApcMin/+小鼠血清Slit2含量的ROC曲线图。
图4是结直肠癌患者和健康志愿者血清Slit2含量的检测结果图;其中,“normal”代表健康志愿者,“CRC”代表结直肠癌患者,“***”代表P<0.001。
图5是结直肠癌患者血清Slit2和健康志愿者血清Slit2含量的ROC曲线图。
图6是抗体特异性阻断Slit2/Robo1信号治疗ApcMin/+小鼠的肿瘤数量和肿瘤体积结果;其中,“***”代表P<0.001,“*”代表P<0.05。
图7是抗体靶向Slit2/Robo1信号治疗LoVo细胞肺转移小鼠模型转移灶数目结果图;其中,“*”代表P<0.05。
具体实施方式
以下结合具体实施例来进一步说明本发明,但实施例并不对本发明做任何形式的限定。除非特别说明,本发明采用的试剂、方法和设备为本技术领域常规试剂、方法和设备。
除非特别说明,以下实施例所用试剂和材料均为市购。
以下实施例中所用的供试小鼠:24周龄正常C57小鼠、9周龄ApcMin/+小鼠、15周龄ApcMin/+小鼠、24周龄ApcMin/+小鼠。
实施例1 H&E染色观察ApcMin/+小鼠肿瘤发展病理进程
1、实验方法
1)小鼠肠道分离
(1)将小鼠麻醉后,使用颈椎脱臼处死法处死小鼠,并呈仰卧位四肢平放在手术板上;
(2)用浸泡了75%酒精的棉球擦拭小鼠腹部,一只手用镊子提起小鼠腹部皮肤,另一只手用手术剪沿腹中线剪开皮肤,然后用镊子轻轻提起腹膜,剪开腹膜,剪时注意不要碰到肠道;
(3)从十二指肠开始往下小心地剥离肠系膜,直至肛门,剥离白色脂肪,将剪下的肠道组织放入1×PBS溶液中,用剪刀将小肠三均等分,肛门到盲肠为结直肠段;
(4)用注射器吸取1×PBS冲洗肠道内容物,置滤纸上吸干多余水分,用干净的手术剪沿肠道纵轴剖开(剪刀悬空剪,尽量不要刮到粘膜层),用棉签小心的将剖开的肠道铺展在滤纸上,标记好是第几段肠,剖开的肠道组织可在空气中放置1min左右,使PBS略干,放入包埋盒后再放入4%多聚甲醛溶液中固定,即完成了小鼠肠道分离。
2)小鼠肠道组织石蜡切片的制备
采用苏木精-伊红染色法(H&E染色)将小鼠的肠道组织固定、包埋,得到石蜡切片,厚度为3~4μm;然后将石蜡切片脱蜡、苏木素染色4min,反蓝,伊红染色3s,37℃过夜、封片;将石蜡切片正置显微镜下,观察各个周龄ApcMin/+小鼠肠道组织结构变化并拍照,记录小鼠肠道组织结构的变化。
2、实验结果
小鼠肿瘤发展病理进程中肠道组织结构变化H&E染色的结果如图1所示,可以看出,24周龄正常C57小鼠小肠绒毛排列整齐,肠道结构分层清晰;9周龄ApcMin/+小鼠小肠腺管增生明显,腺管细胞层数增多变厚;15周龄ApcMin/+小鼠肠道中出现散发的管状绒毛状小肠腺瘤,细胞排列紊乱,腺体和腺体之间的界限消失,出现“背靠背”和共壁现象,但基底膜尚保持完整;24周龄ApcMin/+小鼠肠道中瘤细胞明显复层化,核异型性明显,染色质深染,部分核上浮至腔缘,核极向消失,部分细胞发生核溶解,肿瘤细胞突破基底膜。
实施例2不同病理进程ApcMin/+小鼠血清Slit2表达检测
1、实验方法
1)小鼠眼眶取血
(1)在干燥器内倒入适量乙醚,随后将24周龄正常C57小鼠,9周龄、15周龄、24周龄ApcMin/+小鼠放入干燥器内,由于小鼠死后无法取血,因此,待小鼠昏迷后立即取出,切记麻醉时间不可过长,否则会导致麻痹过久而死;
(2)用长度为1cm左右的毛细管插入小鼠内眼眶下方,食指与中指轻轻旋转毛细管,此时可见血液流出,将流出的血液装入事先编好号码的离心管中(在取血时,轻轻按压心脏可以使小鼠血液充分流出);
(3)取血后,室温静置,待血液明显分层后,于室温5000rpm离心30min(切忌放入4℃离心,否则会溶血),离心完成后,吸取上层血清至编码的新离心管中,吸取完毕后,血清保存于-80℃,以用于后续的酶联免疫吸附(ELISA)实验。
2)小鼠血清Slit2含量检测
小鼠血清Slit2的ELISA检测按照试剂盒(CSB-E11039m,Cusabio Biothech Co.,Wuhan,China)说明书进行操作,检测小鼠血清Slit2含量;利用分光光度计检测ELISA结果,根据标准曲线分析小鼠血清Slit2含量。
3)ROC曲线绘制及灵敏度和特异性分析
利用GraphPad软件,以灵敏度%为纵坐标、100%-特异性%为横坐标,分析ApcMin/+小鼠血清Slit2含量的ROC(receiver operating characteristic)曲线,利用最佳约登指数(敏感度Sensitivity+特异性Specificity-1)确定灵敏度和特异性。
2、实验结果
小鼠肿瘤发展病理进程中血清Slit2含量的检测结果如图2所示,可以看出,9周龄、15周龄、24周龄ApcMin/+小鼠血清Slit2含量均高于24周龄正常C57小鼠,差异十分显著(P<0.001),且24周龄发生腺癌的ApcMin/+小鼠,比9周龄增生期ApcMin/+小鼠血清Slit2含量显著升高(P<0.05)。以上结果表明:随着ApcMin/+小鼠肠道肿瘤病理进程的发展,小鼠血清Slit2含量逐渐升高。
ApcMin/+小鼠血清Slit2含量的ROC曲线如图3所示,可以看出,所有周龄ApcMin/+小鼠组合AUC(曲线下面积)为0.96,灵敏度为97.5%,特异性为87.5%;9周龄ApcMin/+小鼠AUC为0.91,灵敏度为90%,特异性为87.5%;15周龄ApcMin/+小鼠AUC为0.95,灵敏度为100%,特异性为87.5%;24周龄ApcMin/+小鼠AUC为1.0,灵敏度为100%,特异性为100%。
以上结果表明:利用小鼠血清Slit2可有效的区分肠道肿瘤小鼠和健康小鼠,而且可以早期检测结直肠癌,灵敏度高、特异性强。
实施例3临床结直肠癌患者血清Slit2表达检测
1、实验方法
1)外周血标本的收集与处理
外周血标本收取于广东药科大学第一附属医院,分别收取14例结直肠癌患者血清、14例健康志愿者血清,每个标本收集0.5mL于冻存管中,放于-80℃冰箱保存,以用于后续的ELISA实验。所有研究对象均知情同意参加本项实验,并通过医院伦理委员会同意。
2)血清Slit2含量检测
患者血清Slit2和健康志愿者血清Slit2的ELISA检测按照试剂盒(CSB-E11039m,Cusabio Biothech Co.,Wuhan,China)说明书进行操作,检测患者血清Slit2和健康志愿者血清Slit2含量;利用分光光度计检测ELISA结果,根据标准曲线分析患者血清Slit2和健康志愿者血清Slit2含量。
3)ROC曲线绘制及灵敏度和特异性分析
利用GraphPad软件,以灵敏度%为纵坐标、100%-特异性%为横坐标,分析患者血清Slit2和和健康志愿者血清Slit2的ROC曲线,利用最佳约登指数(敏感度Sensitivity+特异性Specificity-1)确定灵敏度和特异性。
2、实验结果
结直肠癌患者血清Slit2和健康志愿者血清Slit2含量的检测结果如图4所示,可以看出,结直肠癌患者血清Slit2含量高于健康志愿者,差异十分显著(P<0.001)。以上结果表明:结直肠癌患者血清Slit2含量升高。
结直肠癌患者血清Slit2和健康志愿者血清Slit2含量的ROC曲线如图5所示,可以看出,结直肠癌患者AUC为0.92,灵敏度为78.6%,特异性为92.9%。以上结果表明:利用血清Slit2可有效的区分结直肠癌患者和健康人。
实施例4抗体特异性阻断Slit2/Robo1信号治疗ApcMin/+小鼠
1、实验方法
1)小鼠肠道肿瘤数量和肿瘤体积测定
(1)9周龄ApcMin/+小鼠隔天腹腔注射IgG或Slit2/Robo1信号特异性阻断抗体R5(1mg/只),持续4周,治疗后处死小鼠;
(2)将步骤(1)得到的13周龄ApcMin/+小鼠(每组至少6只)按照实施例1中步骤1)的方法分离和固定肠道,随后用0.4%亚甲蓝瞬时染色小鼠肠道组织;
(2)染色时间根据染色深浅而定,染色过深则可用70%乙醇脱色,将染好的小鼠肠道置于不透光面板上;
(3)用体式显微镜200倍镜观察,利用显微镜自带软件测量工具,来测量每个腺瘤的最长径和最短径,总体长短径数目的二分之一为单位长度内肿瘤的数量,肿瘤体积的计算公式如下:
体积=4/3πab2(a为长径的一半,b为短径的一半)
(4)肠道肿瘤的分级:可分为微腺瘤(MA)和腺瘤(AD)两类,微腺瘤定义为:体积不超过2mm x 2mm的肿瘤,腺瘤定义为:体积大于2mm的肿瘤;完成肠道肿瘤计数后,肠道组织可用70%乙醇保存备用,或直接进行脱水处理。
2、实验结果
抗体特异性阻断Slit2/Robo1信号治疗ApcMin/+小鼠的肿瘤数量和肿瘤体积结果如图6所示,从图6中的A可以看出,注射IgG的小鼠肠道微腺瘤的数量显著高于注射R5的小鼠肠道微腺瘤的数量(P<0.05),而注射IgG的小鼠肠道腺瘤的数量与注射R5的小鼠肠道腺瘤的数量无显著差异,注射IgG的小鼠肠道肿瘤的数量显著高于注射R5的小鼠肠道肿瘤的数量(P<0.05);
从图6中的B可以看出,注射IgG的小鼠肠道微腺瘤的体积高于注射R5的小鼠肠道微腺瘤的体积,差异十分显著(P<0.001),而注射IgG的小鼠肠道腺瘤的体积与注射R5的小鼠肠道腺瘤的体积无显著差异,注射IgG的小鼠肠道肿瘤的体积显著高于注射R5的小鼠肠道肿瘤的体积(P<0.05)。以上结果表明:靶向Slit2/Robo1信号治疗可以显著抑制小鼠肠道肿瘤的早期生长和增殖。相反,Slit2/Robo1信号激活,可以促进肿瘤的生长和增殖。
实施例5抗体特异性阻断Slit2/Robo1信号治疗LoVo细胞小鼠肺转移模型
1、实验方法
(1)将106个LoVo细胞经尾静脉注射到12只24周龄正常C57小鼠中;
(2)隔天腹腔注射IgG或Slit2/Robo1信号特异性阻断抗体R5(1mg/只),持续3周;
(3)3周后处死小鼠,剥离肺组织,用包因氏固定液固定,统计小鼠肺表面的结节数目。
2、实验结果
抗体靶向Slit2/Robo1信号治疗LoVo细胞肺转移小鼠模型转移灶数目结果如图7所示,可以看出,注射IgG的小鼠转移灶数目显著高于注射R5的小鼠转移灶数目(P<0.05)。以上结果表明:靶向Slit2/Robo1信号治疗可以显著抑制小鼠肠道肿瘤的转移。相反,Slit2/Robo1信号激活,可以促进肿瘤的转移。
以上具体实施方式为便于理解本发明而说明的较佳实施例,但本发明并不局限于上述实施例,即不意味着本发明必须依赖上述实施例才能实施。所属技术领域的技术人员应该明了,对本发明的任何改进,对本发明所选用原料的等效替换及辅助成分的添加、具体方式的选择等,均落在本发明的保护范围和公开范围之内。
序列表
<110> 广东药科大学
<120> 血清Slit2作为结直肠癌诊治和转移监测标志物的应用
<160> 2
<170> SIPOSequenceListing 1.0
<210> 1
<211> 4578
<212> DNA
<213> 人工序列(Artificial Sequence)
<400> 1
atgcgcggcg ttggctggca gatgctgtcc ctgtcgctgg ggttagtgct ggcgatcctg 60
aacaaggtgg caccgcaggc gtgcccggcg cagtgctctt gctcgggcag cacagtggac 120
tgtcacgggc tggcgctgcg cagcgtgccc aggaatatcc cccgcaacac cgagagactg 180
gatttaaatg gaaataacat cacaagaatt acgaagacag attttgctgg tcttagacat 240
ctaagagttc ttcagcttat ggagaataag attagcacca ttgaaagagg agcattccag 300
gatcttaaag aactagagag actgcgttta aacagaaatc accttcagct gtttcctgag 360
ttgctgtttc ttgggactgc gaagctatac aggcttgatc tcagtgaaaa ccaaattcag 420
gcaatcccaa ggaaagcttt ccgtggggca gttgacataa aaaatttgca actggattac 480
aaccagatca gctgtattga agatggggca ttcagggctc tccgggacct ggaagtgctc 540
actctcaaca ataacaacat tactagactt tctgtggcaa gtttcaacca tatgcctaaa 600
cttaggactt ttcgactgca ttcaaacaac ctgtattgtg actgccacct ggcctggctc 660
tccgactggc ttcgcaaaag gcctcgggtt ggtctgtaca ctcagtgtat gggcccctcc 720
cacctgagag gccataatgt agccgaggtt caaaaacgag aatttgtctg cagtgatgag 780
gaagaaggtc accagtcatt tatggctcct tcttgtagtg ttttgcactg ccctgccgcc 840
tgtacctgta gcaacaatat cgtagactgt cgtgggaaag gtctcactga gatccccaca 900
aatcttccag agaccatcac agaaatacgt ttggaacaga acacaatcaa agtcatccct 960
cctggagctt tctcaccata taaaaagctt agacgaattg acctgagcaa taatcagatc 1020
tctgaacttg caccagatgc tttccaagga ctacgctctc tgaattcact tgtcctctat 1080
ggaaataaaa tcacagaact ccccaaaagt ttatttgaag gactgttttc cttacagctc 1140
ctattattga atgccaacaa gataaactgc cttcgggtag atgcttttca ggatctccac 1200
aacttgaacc ttctctccct atatgacaac aagcttcaga ccatcgccaa ggggaccttt 1260
tcacctcttc gggccattca aactatgcat ttggcccaga acccctttat ttgtgactgc 1320
catctcaagt ggctagcgga ttatctccat accaacccga ttgagaccag tggtgcccgt 1380
tgcaccagcc cccgccgcct ggcaaacaaa agaattggac agatcaaaag caagaaattc 1440
cgttgttcag gtacagaaga ttatcgatca aaattaagtg gagactgctt tgcggatctg 1500
gcttgccctg aaaagtgtcg ctgtgaagga accacagtag attgctctaa tcaaaagctc 1560
aacaaaatcc cggagcacat tccccagtac actgcagagt tgcgtctcaa taataatgaa 1620
tttaccgtgt tggaagccac aggaatcttt aagaaacttc ctcaattacg taaaataaac 1680
tttagcaaca ataagatcac agatattgag gagggagcat ttgaaggagc atctggtgta 1740
aatgaaatac ttcttacgag taatcgtttg gaaaatgtgc agcataagat gttcaaggga 1800
ttggaaagcc tcaaaacttt gatgttgaga agcaatcgaa taacctgtgt ggggaatgac 1860
agtttcatag gactcagttc tgtgcgtttg ctttctttgt atgataatca aattactaca 1920
gttgcaccag gggcatttga tactctccat tctttatcta ctctaaacct cttggccaat 1980
ccttttaact gtaactgcta cctggcttgg ttgggagagt ggctgagaaa gaagagaatt 2040
gtcacgggaa atcctagatg tcaaaaacca tacttcctga aagaaatacc catccaggat 2100
gtggccattc aggacttcac ttgtgatgac ggaaatgatg acaatagttg ctccccactt 2160
tctcgctgtc ctactgaatg tacttgcttg gatacagtcg tccgatgtag caacaagggt 2220
ttgaaggtct tgccgaaagg tattccaaga gatgtcacag agttgtatct ggatggaaac 2280
caatttacac tggttcccaa ggaactctcc aactacaaac atttaacact tatagactta 2340
agtaacaaca gaataagcac gctttctaat cagagcttca gcaacatgac ccagctcctc 2400
accttaattc ttagttacaa ccgtctgaga tgtattcctc ctcgcacctt tgatggatta 2460
aagtctcttc gattactttc tctacatgga aatgacattt ctgttgtgcc tgaaggtgct 2520
ttcaatgatc tttctgcatt atcacatcta gcaattggag ccaaccctct ttactgtgat 2580
tgtaacatgc agtggttatc cgactgggtg aagtcggaat ataaggagcc tggaattgct 2640
cgttgtgctg gtcctggaga aatggcagat aaacttttac tcacaactcc ctccaaaaaa 2700
tttacctgtc aaggtcctgt ggatgtcaat attctagcta agtgtaaccc ctgcctatca 2760
aatccgtgta aaaatgatgg cacatgtaat agtgatccag ttgactttta ccgatgcacc 2820
tgtccatatg gtttcaaggg gcaggactgt gatgtcccaa ttcatgcctg catcagtaac 2880
ccatgtaaac atggaggaac ttgccactta aaggaaggag aagaagatgg attctggtgt 2940
atttgtgctg atggatttga aggagaaaat tgtgaagtca acgttgatga ttgtgaagat 3000
aatgactgtg aaaataattc tacatgtgtc gatggcatta ataactacac atgcctttgc 3060
ccacctgagt atacaggtga gttgtgtgag gagaagctgg acttctgtgc ccaggacctg 3120
aacccctgcc agcacgattc aaagtgcatc ctaactccaa agggattcaa atgtgactgc 3180
acaccagggt acgtaggtga acactgcgac atcgattttg acgactgcca agacaacaag 3240
tgtaaaaacg gagcccactg cacagatgca gtgaacggct atacgtgcat atgccccgaa 3300
ggttacagtg gcttgttctg tgagttttct ccacccatgg tcctccctcg taccagcccc 3360
tgtgataatt ttgattgtca gaatggagct cagtgtatcg tcagaataaa tgagccaata 3420
tgtcagtgtt tgcctggcta tcagggagaa aagtgtgaaa aattggttag tgtgaatttt 3480
ataaacaaag agtcttatct tcagattcct tcagccaagg ttcggcctca gacgaacata 3540
acacttcaga ttgccacaga tgaagacagc ggaatcctcc tgtataaggg tgacaaagac 3600
catatcgcgg tagaactcta tcgggggcgt gttcgtgcca gctatgacac cggctctcat 3660
ccagcttctg ccatttacag tgtggagaca atcaatgatg gaaacttcca cattgtggaa 3720
ctacttgcct tggatcagag tctctctttg tccgtggatg gtgggaaccc caaaatcatc 3780
actaacttgt caaagcagtc cactctgaat tttgactctc cactctatgt aggaggcatg 3840
ccagggaaga gtaacgtggc atctctgcgc caggcccctg ggcagaacgg aaccagcttc 3900
cacggctgca tccggaacct ttacatcaac agtgagctgc aggacttcca gaaggtgccg 3960
atgcaaacag gcattttgcc tggctgtgag ccatgccaca agaaggtgtg tgcccatggc 4020
acatgccagc ccagcagcca ggcaggcttc acctgcgagt gccaggaagg atggatgggg 4080
cccctctgtg accaacggac caatgaccct tgccttggaa ataaatgcgt acatggcacc 4140
tgcttgccca tcaatgcgtt ctcctacagc tgtaagtgct tggagggcca tggaggtgtc 4200
ctctgtgatg aagaggagga tctgtttaac ccatgccagg cgatcaagtg caagcatggg 4260
aagtgcaggc tttcaggtct ggggcagccc tactgtgaat gcagcagtgg atacacgggg 4320
gacagctgtg atcgagaaat ctcttgtcga ggggaaagga taagagatta ttaccaaaag 4380
cagcagggct atgctgcttg ccaaacaacc aagaaggtgt cccgattaga gtgcagaggt 4440
gggtgtgcag gagggcagtg ctgtggaccg ctgaggagca agcggcggaa atactctttc 4500
gaatgcactg acggctcctc ctttgtggac gaggttgaga aagtggtgaa gtgcggctgt 4560
acgaggtgtg tgtcctaa 4578
<210> 2
<211> 1521
<212> PRT
<213> 人工序列(Artificial Sequence)
<400> 2
Met Arg Gly Val Gly Trp Gln Met Leu Ser Leu Ser Leu Gly Leu Val
1 5 10 15
Leu Ala Ile Leu Asn Lys Val Ala Pro Gln Ala Cys Pro Ala Gln Cys
20 25 30
Ser Cys Ser Gly Ser Thr Val Asp Cys His Gly Leu Ala Leu Arg Ser
35 40 45
Val Pro Arg Asn Ile Pro Arg Asn Thr Glu Arg Leu Asp Leu Asn Gly
50 55 60
Asn Asn Ile Thr Arg Ile Thr Lys Thr Asp Phe Ala Gly Leu Arg His
65 70 75 80
Leu Arg Val Leu Gln Leu Met Glu Asn Lys Ile Ser Thr Ile Glu Arg
85 90 95
Gly Ala Phe Gln Asp Leu Lys Glu Leu Glu Arg Leu Arg Leu Asn Arg
100 105 110
Asn His Leu Gln Leu Phe Pro Glu Leu Leu Phe Leu Gly Thr Ala Lys
115 120 125
Leu Tyr Arg Leu Asp Leu Ser Glu Asn Gln Ile Gln Ala Ile Pro Arg
130 135 140
Lys Ala Phe Arg Gly Ala Val Asp Ile Lys Asn Leu Gln Leu Asp Tyr
145 150 155 160
Asn Gln Ile Ser Cys Ile Glu Asp Gly Ala Phe Arg Ala Leu Arg Asp
165 170 175
Leu Glu Val Leu Thr Leu Asn Asn Asn Asn Ile Thr Arg Leu Ser Val
180 185 190
Ala Ser Phe Asn His Met Pro Lys Leu Arg Thr Phe Arg Leu His Ser
195 200 205
Asn Asn Leu Tyr Cys Asp Cys His Leu Ala Trp Leu Ser Asp Trp Leu
210 215 220
Arg Gln Arg Pro Arg Val Gly Leu Tyr Thr Gln Cys Met Gly Pro Ser
225 230 235 240
His Leu Arg Gly His Asn Val Ala Glu Val Gln Lys Arg Glu Phe Val
245 250 255
Cys Ser Gly His Gln Ser Phe Met Ala Pro Ser Cys Ser Val Leu His
260 265 270
Cys Pro Ala Ala Cys Thr Cys Ser Asn Asn Ile Val Asp Cys Arg Gly
275 280 285
Lys Gly Leu Thr Glu Ile Pro Thr Asn Leu Pro Glu Thr Ile Thr Glu
290 295 300
Ile Arg Leu Glu Gln Asn Thr Ile Lys Val Ile Pro Pro Gly Ala Phe
305 310 315 320
Ser Pro Tyr Lys Lys Leu Arg Arg Ile Asp Leu Ser Asn Asn Gln Ile
325 330 335
Ser Glu Leu Ala Pro Asp Ala Phe Gln Gly Leu Arg Ser Leu Asn Ser
340 345 350
Leu Val Leu Tyr Gly Asn Lys Ile Thr Glu Leu Pro Lys Ser Leu Phe
355 360 365
Glu Gly Leu Phe Ser Leu Gln Leu Leu Leu Leu Asn Ala Asn Lys Ile
370 375 380
Asn Cys Leu Arg Val Asp Ala Phe Gln Asp Leu His Asn Leu Asn Leu
385 390 395 400
Leu Ser Leu Tyr Asp Asn Lys Leu Gln Thr Ile Ala Lys Gly Thr Phe
405 410 415
Ser Pro Leu Arg Ala Ile Gln Thr Met His Leu Ala Gln Asn Pro Phe
420 425 430
Ile Cys Asp Cys His Leu Lys Trp Leu Ala Asp Tyr Leu His Thr Asn
435 440 445
Pro Ile Glu Thr Ser Gly Ala Arg Cys Thr Ser Pro Arg Arg Leu Ala
450 455 460
Asn Lys Arg Ile Gly Gln Ile Lys Ser Lys Lys Phe Arg Cys Ser Gly
465 470 475 480
Thr Glu Asp Tyr Arg Ser Lys Leu Ser Gly Asp Cys Phe Ala Asp Leu
485 490 495
Ala Cys Pro Glu Lys Cys Arg Cys Glu Gly Thr Thr Val Asp Cys Ser
500 505 510
Asn Gln Lys Leu Asn Lys Ile Pro Glu His Ile Pro Gln Tyr Thr Ala
515 520 525
Glu Leu Arg Leu Asn Asn Asn Glu Phe Thr Val Leu Glu Ala Thr Gly
530 535 540
Ile Phe Lys Lys Leu Pro Gln Leu Arg Lys Ile Asn Phe Ser Asn Asn
545 550 555 560
Lys Ile Thr Asp Ile Glu Glu Gly Ala Phe Glu Gly Ala Ser Gly Val
565 570 575
Asn Glu Ile Leu Leu Thr Ser Asn Arg Leu Glu Asn Val Gln His Lys
580 585 590
Met Phe Lys Gly Leu Glu Ser Leu Lys Thr Leu Met Leu Arg Ser Asn
595 600 605
Arg Ile Thr Cys Val Gly Asn Asp Ser Phe Ile Gly Leu Ser Ser Val
610 615 620
Arg Leu Leu Ser Leu Tyr Asp Asn Gln Ile Thr Thr Val Ala Pro Gly
625 630 635 640
Ala Phe Asp Thr Leu His Ser Leu Ser Thr Leu Asn Leu Leu Ala Asn
645 650 655
Pro Phe Asn Cys Asn Cys Tyr Leu Ala Trp Leu Gly Glu Trp Leu Arg
660 665 670
Lys Lys Arg Ile Val Thr Gly Asn Pro Arg Cys Gln Lys Pro Tyr Phe
675 680 685
Leu Lys Glu Ile Pro Ile Gln Asp Val Ala Ile Gln Asp Phe Thr Cys
690 695 700
Asp Asp Gly Asn Asp Asp Asn Ser Cys Ser Pro Leu Ser Arg Cys Pro
705 710 715 720
Thr Glu Cys Thr Cys Leu Asp Thr Val Val Arg Cys Ser Asn Lys Gly
725 730 735
Leu Lys Val Leu Pro Lys Gly Ile Pro Arg Asp Val Thr Glu Leu Tyr
740 745 750
Leu Asp Gly Asn Gln Phe Thr Leu Val Pro Lys Glu Leu Ser Asn Tyr
755 760 765
Lys His Leu Thr Leu Ile Asp Leu Ser Asn Asn Arg Ile Ser Thr Leu
770 775 780
Ser Asn Gln Ser Phe Ser Asn Met Thr Gln Leu Leu Thr Leu Ile Leu
785 790 795 800
Ser Tyr Asn Arg Leu Arg Cys Ile Pro Pro Arg Thr Phe Asp Gly Leu
805 810 815
Lys Ser Leu Arg Leu Leu Ser Leu His Gly Asn Asp Ile Ser Val Val
820 825 830
Pro Glu Gly Ala Phe Asn Asp Leu Ser Ala Leu Ser His Leu Ala Ile
835 840 845
Gly Ala Asn Pro Leu Tyr Cys Asp Cys Asn Met Gln Trp Leu Ser Asp
850 855 860
Trp Val Lys Ser Glu Tyr Lys Glu Pro Gly Ile Ala Arg Cys Ala Gly
865 870 875 880
Pro Gly Glu Met Ala Asp Lys Leu Leu Leu Thr Thr Pro Ser Lys Lys
885 890 895
Phe Thr Cys Gln Gly Pro Val Asp Val Asn Ile Leu Ala Lys Cys Asn
900 905 910
Pro Cys Leu Ser Asn Pro Cys Lys Asn Asp Gly Thr Cys Asn Ser Asp
915 920 925
Pro Val Asp Phe Tyr Arg Cys Thr Cys Pro Tyr Gly Phe Lys Gly Gln
930 935 940
Asp Cys Asp Val Pro Ile His Ala Cys Ile Ser Asn Pro Cys Lys His
945 950 955 960
Gly Gly Thr Cys His Leu Lys Glu Gly Glu Glu Asp Gly Phe Trp Cys
965 970 975
Ile Cys Ala Asp Gly Phe Glu Gly Glu Asn Cys Glu Val Asn Val Asp
980 985 990
Asp Cys Glu Asp Asn Asp Cys Glu Asn Asn Ser Thr Cys Val Asp Gly
995 1000 1005
Ile Asn Asn Tyr Thr Cys Leu Cys Pro Pro Glu Tyr Thr Gly Glu Leu
1010 1015 1020
Cys Glu Glu Lys Leu Asp Phe Cys Ala Gln Asp Leu Asn Pro Cys Gln
1025 1030 1035 1040
His Asp Ser Lys Cys Ile Leu Thr Pro Lys Gly Phe Lys Cys Asp Cys
1045 1050 1055
Thr Pro Gly Tyr Val Gly Glu His Cys Asp Ile Asp Phe Asp Asp Cys
1060 1065 1070
Gln Asp Asn Lys Cys Lys Asn Gly Ala His Cys Thr Asp Ala Val Asn
1075 1080 1085
Gly Tyr Thr Cys Ile Cys Pro Glu Gly Tyr Ser Gly Leu Phe Cys Glu
1090 1095 1100
Phe Ser Pro Pro Met Val Leu Pro Arg Thr Ser Pro Cys Asp Asn Phe
1105 1110 1115 1120
Asp Cys Gln Asn Gly Ala Gln Cys Ile Val Arg Ile Asn Glu Pro Ile
1125 1130 1135
Cys Gln Cys Leu Pro Gly Tyr Gln Gly Glu Lys Cys Glu Lys Leu Val
1140 1145 1150
Ser Val Asn Phe Ile Asn Lys Glu Ser Tyr Leu Gln Ile Pro Ser Ala
1155 1160 1165
Lys Val Arg Pro Gln Thr Asn Ile Thr Leu Gln Ile Ala Thr Asp Glu
1170 1175 1180
Asp Ser Gly Ile Leu Leu Tyr Lys Gly Asp Lys Asp His Ile Ala Val
1185 1190 1195 1200
Glu Leu Tyr Arg Gly Arg Val Arg Ala Ser Tyr Asp Thr Gly Ser His
1205 1210 1215
Pro Ala Ser Ala Ile Tyr Ser Val Glu Thr Ile Asn Asp Gly Asn Phe
1220 1225 1230
His Ile Val Glu Leu Leu Ala Leu Asp Gln Ser Leu Ser Leu Ser Val
1235 1240 1245
Asp Gly Gly Asn Pro Lys Ile Ile Thr Asn Leu Ser Lys Gln Ser Thr
1250 1255 1260
Leu Asn Phe Asp Ser Pro Leu Tyr Val Gly Gly Met Pro Gly Lys Ser
1265 1270 1275 1280
Asn Val Ala Ser Leu Arg Gln Ala Pro Gly Gln Asn Gly Thr Ser Phe
1285 1290 1295
His Gly Cys Ile Arg Asn Leu Tyr Ile Asn Ser Glu Leu Gln Asp Phe
1300 1305 1310
Gln Lys Val Pro Met Gln Thr Gly Ile Leu Pro Gly Cys Glu Pro Cys
1315 1320 1325
His Lys Lys Val Cys Ala His Gly Thr Cys Gln Pro Ser Ser Gln Ala
1330 1335 1340
Gly Phe Thr Cys Glu Cys Gln Glu Gly Trp Met Gly Pro Leu Cys Asp
1345 1350 1355 1360
Gln Arg Thr Asn Asp Pro Cys Leu Gly Asn Lys Cys Val His Gly Thr
1365 1370 1375
Cys Leu Pro Ile Asn Ala Phe Ser Tyr Ser Cys Lys Cys Leu Glu Gly
1380 1385 1390
His Gly Gly Val Leu Cys Asp Glu Glu Glu Asp Leu Phe Asn Pro Cys
1395 1400 1405
Gln Ala Ile Lys Cys Lys His Gly Lys Cys Arg Leu Ser Gly Leu Gly
1410 1415 1420
Gln Pro Tyr Cys Glu Cys Ser Ser Gly Tyr Thr Gly Asp Ser Cys Asp
1425 1430 1435 1440
Arg Glu Ile Ser Cys Arg Gly Glu Arg Ile Arg Asp Tyr Tyr Gln Lys
1445 1450 1455
Gln Gln Gly Tyr Ala Ala Cys Gln Thr Thr Lys Lys Val Ser Arg Leu
1460 1465 1470
Glu Cys Arg Gly Gly Cys Ala Gly Gly Gln Cys Cys Gly Pro Leu Arg
1475 1480 1485
Ser Lys Arg Arg Lys Tyr Ser Phe Glu Cys Thr Asp Gly Ser Ser Phe
1490 1495 1500
Val Asp Glu Val Glu Lys Val Val Lys Cys Gly Cys Thr Arg Cys Val
1505 1510 1515 1520
Ser

Claims (6)

1.血清Slit2的检测试剂在制备结直肠癌诊断制剂方面的应用。
2.血清Slit2的检测试剂在制备结直肠癌远处转移监测制剂方面的应用。
3.血清Slit2的抑制剂在制备结直肠癌治疗试剂方面的应用。
4.根据权利要求3所述的应用,其特征在于,所述治疗试剂是能够抑制结直肠癌细胞的生长、增殖和/或转移的治疗试剂。
5.根据权利要求4所述的应用,其特征在于,所述抑制剂为Slit2/Robo1信号抑制剂。
6.根据权利要求5所述的应用,其特征在于,所述血清为外周血血清。
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