目的观察甲基化抑制剂5-氮杂-2′-脱氧胞苷(5-aza-2′-deoxycytidine,5-Aza-CdR)对肺癌SPC-A1细胞增殖、细胞划痕和凋亡的影响,探讨抑癌基因分泌型卷曲相关蛋白1(secreted frizzled related protein 1,SFRP1)和O6-甲基鸟嘌呤-DNA甲基转...目的观察甲基化抑制剂5-氮杂-2′-脱氧胞苷(5-aza-2′-deoxycytidine,5-Aza-CdR)对肺癌SPC-A1细胞增殖、细胞划痕和凋亡的影响,探讨抑癌基因分泌型卷曲相关蛋白1(secreted frizzled related protein 1,SFRP1)和O6-甲基鸟嘌呤-DNA甲基转移酶(O6-methylguanine-DNA-methyltransferase,MGMT)基因启动子区DNA甲基化mRNA和蛋白在其中的表达和意义。方法CCK-8法检测不同浓度的5-Aza-CdR对人肺癌SPC-A1细胞增殖影响,划痕实验测定5-Aza-CdR对SPC-A1细胞迁移能力的影响,Hoechst 33258染色检测(0、3、10、30μmol·L^(-1))5-Aza-CdR处理肺癌SPC-A1细胞24h后细胞凋亡情况,RT-PCR、Western blot法检测SPC-A1细胞中SFRP1和MGMT的mRNA、蛋白表达。结果5-Aza-CdR可以浓度梯度的抑制肺癌SPC-A1细胞增殖,IC 50为21.2μmol·L^(-1);5-Aza-CdR(3、10、30μmol·L^(-1))作用48 h后,肺癌SPC-A1细胞划痕愈合分别为对照组的(92.4±2.6)%、(83.6±4.2)%、(76.7±4.5)%;5-Aza-CdR处理肺癌SPC-A1细胞后,出现典型的细胞凋亡形态学改变;不同浓度5-Aza-CdR(3、10、30μmol·L^(-1))处理SPC-A1细胞24 h后,SFRP1、MGMT mRNA和蛋白表达增加(P<0.05)。结论5-Aza-CdR可抑制肺癌SPC-A1细胞增殖,抑制肺癌细胞划痕修复和促进凋亡,可能与升高MGMT和SFRPl的甲基化表达有关。展开更多
Objective：To investigate the feasibility of the combination of detecting hypermethylated secreted frizzled-related protein 1 （SFRP1） and secreted frizzled-related protein 2（SFRP2） in feces as a panel of biomarker...Objective：To investigate the feasibility of the combination of detecting hypermethylated secreted frizzled-related protein 1 （SFRP1） and secreted frizzled-related protein 2（SFRP2） in feces as a panel of biomarkers for colorectal cancer（CRC） screening. Methods： Methylation-specific PCR（MSP） was performed to analyze methylation status of SFRP1 and SFRP2 in a blinded fashion in tumor tissues and in matched stool samples from 39 patients with primary CRC, 34 patients with adenomas, 17 patients with hyperplastic polyps and 20 endoscopically normal subjects as normal controls. Simultaneously we analyzed the correlation of hypermethylated SFRP1 and SFRP2 with the clinicopathological features of CRC. Results：Hypermethylated SFRP1 was detected in 92.3%, 76.5%, 47.1% of tissue samples and in 89.7%, 64.7%, 35.3% of matched fecal samples from CRC, adenoma and hyperplastic polyp, respectively. Hypermethylated SFRP2 was detected in 87.2%, 67.6%, 35.3% of tissue samples and in 82.1%, 55.9%, 29.4% of matched fecal samples from CRC, adenoma and hyperplastic polyp, respectively. Of these two genes, at least one hypermethylated was 94.9%, 82.4%, 52.9% in tissue samples and 92.3%,73.5%, 47.1% in matched fecal samples from CRC, adenoma and hyperplastic polyp, respectively. In contrast, no hypermethylated SFRP1 and SFRP2 were detected in mucosa tissues of normal controls, only 2 cases of fecal samples was detected with hypermethylated SFRP1 and another 1 case was detected with hypermethylated SFRP2. Moreover, no significant associations were observed between hypermethylated SFRP1,SFRP2 and clinicopathological features of CRC. Conclusion： Hypermethylation of SFRP1 and SFRP2 in feces are novel epigenetic biomarkers of CRC and carded high potential for the remote detection of CRC as non-invasive screening method, and combined analysis of hypermethylated SFRP1 and SFRP2 in fecal could further increase the detection rate of CRC and premalignant lesions.展开更多
目的:探讨粪便中分泌型卷曲相关蛋白2(secreted frizzled-related protein 2,SFRP2)基因超甲基化作为筛查大肠癌的非侵袭性工具的可行性。方法:用甲基化特异性PCR(MSP)技术分析69例大肠癌、34例腺瘤和26例增生性息肉患者的瘤组织和粪便...目的:探讨粪便中分泌型卷曲相关蛋白2(secreted frizzled-related protein 2,SFRP2)基因超甲基化作为筛查大肠癌的非侵袭性工具的可行性。方法:用甲基化特异性PCR(MSP)技术分析69例大肠癌、34例腺瘤和26例增生性息肉患者的瘤组织和粪便中SFRP2基因启动子甲基化状态,30例内镜下正常的健康者作为对照。其中大肠癌患者的粪便分别于术前及术后第9天采集。同时分析SFRP2基因甲基化与肿瘤临床病理因素之间的关系。结果:SFRP2基因在91.3%(63/69)的大肠癌组织、79.4%(27/34)的腺瘤组织和53.8%(14/26)的增生性息肉组织中发生超甲基化,并在同一患者所对应的粪便中有87.0%(60/69)、61.8%(21/34)和42.3%(11/26)检测到发生超甲基化。在正常对照的结肠黏膜中没有检测到SFRP2基因甲基化,但在粪便中有2例发生了SFRP2基因甲基化。在大肠癌患者术前和术后第9天的粪便中SFRP2基因超甲基化比较差异有统计学意义(P<0.001)。此外,SFRP2超甲基化与肿瘤的临床特征包括性别、年龄、肿瘤分期、位置及病理分级等无显著相关性。结论:粪便中SFRP2基因超甲基化是大肠癌的一种新的分子标志,对于非侵袭性检测大肠癌具有高度的潜力。展开更多
基金supported by the grant from Programs of Science and Technology Commission Foundation of Jiangsu Province(NO.BS2005036)
文摘Objective：To investigate the feasibility of the combination of detecting hypermethylated secreted frizzled-related protein 1 （SFRP1） and secreted frizzled-related protein 2（SFRP2） in feces as a panel of biomarkers for colorectal cancer（CRC） screening. Methods： Methylation-specific PCR（MSP） was performed to analyze methylation status of SFRP1 and SFRP2 in a blinded fashion in tumor tissues and in matched stool samples from 39 patients with primary CRC, 34 patients with adenomas, 17 patients with hyperplastic polyps and 20 endoscopically normal subjects as normal controls. Simultaneously we analyzed the correlation of hypermethylated SFRP1 and SFRP2 with the clinicopathological features of CRC. Results：Hypermethylated SFRP1 was detected in 92.3%, 76.5%, 47.1% of tissue samples and in 89.7%, 64.7%, 35.3% of matched fecal samples from CRC, adenoma and hyperplastic polyp, respectively. Hypermethylated SFRP2 was detected in 87.2%, 67.6%, 35.3% of tissue samples and in 82.1%, 55.9%, 29.4% of matched fecal samples from CRC, adenoma and hyperplastic polyp, respectively. Of these two genes, at least one hypermethylated was 94.9%, 82.4%, 52.9% in tissue samples and 92.3%,73.5%, 47.1% in matched fecal samples from CRC, adenoma and hyperplastic polyp, respectively. In contrast, no hypermethylated SFRP1 and SFRP2 were detected in mucosa tissues of normal controls, only 2 cases of fecal samples was detected with hypermethylated SFRP1 and another 1 case was detected with hypermethylated SFRP2. Moreover, no significant associations were observed between hypermethylated SFRP1,SFRP2 and clinicopathological features of CRC. Conclusion： Hypermethylation of SFRP1 and SFRP2 in feces are novel epigenetic biomarkers of CRC and carded high potential for the remote detection of CRC as non-invasive screening method, and combined analysis of hypermethylated SFRP1 and SFRP2 in fecal could further increase the detection rate of CRC and premalignant lesions.
文摘目的:探讨粪便中分泌型卷曲相关蛋白2(secreted frizzled-related protein 2,SFRP2)基因超甲基化作为筛查大肠癌的非侵袭性工具的可行性。方法:用甲基化特异性PCR(MSP)技术分析69例大肠癌、34例腺瘤和26例增生性息肉患者的瘤组织和粪便中SFRP2基因启动子甲基化状态,30例内镜下正常的健康者作为对照。其中大肠癌患者的粪便分别于术前及术后第9天采集。同时分析SFRP2基因甲基化与肿瘤临床病理因素之间的关系。结果:SFRP2基因在91.3%(63/69)的大肠癌组织、79.4%(27/34)的腺瘤组织和53.8%(14/26)的增生性息肉组织中发生超甲基化,并在同一患者所对应的粪便中有87.0%(60/69)、61.8%(21/34)和42.3%(11/26)检测到发生超甲基化。在正常对照的结肠黏膜中没有检测到SFRP2基因甲基化,但在粪便中有2例发生了SFRP2基因甲基化。在大肠癌患者术前和术后第9天的粪便中SFRP2基因超甲基化比较差异有统计学意义(P<0.001)。此外,SFRP2超甲基化与肿瘤的临床特征包括性别、年龄、肿瘤分期、位置及病理分级等无显著相关性。结论:粪便中SFRP2基因超甲基化是大肠癌的一种新的分子标志,对于非侵袭性检测大肠癌具有高度的潜力。
