目的:探讨微小RNA-9-5p(mi R-9-5p)调控肿瘤高甲基化基因1(hypermethylated in cancer 1,HIC1)对乳腺癌MDA-MB-231细胞对化疗药多柔比星敏感性的影响及其作用机制。方法:(1)使用慢病毒转染建立上调或下调mi R-9-5p细胞,加入不同浓度多...目的:探讨微小RNA-9-5p(mi R-9-5p)调控肿瘤高甲基化基因1(hypermethylated in cancer 1,HIC1)对乳腺癌MDA-MB-231细胞对化疗药多柔比星敏感性的影响及其作用机制。方法:(1)使用慢病毒转染建立上调或下调mi R-9-5p细胞,加入不同浓度多柔比星后,用CCK-8和流式细胞仪检测细胞活力和凋亡情况。(2)通过反转录-聚合酶链反应(reverse transcription-polymerase chain reaction,RT-PCR)和蛋白质印迹试验检测上调或下调miR-9-5p时HIC1的表达情况。通过数据库资料、双荧光素酶报告基因系统验证miR-9-5p与HIC1的关系。(3)下调HIC1,观察加入多柔比星后细胞活力和凋亡情况。结果:(1)上调miR-9-5p可提高细胞活力、抑制凋亡。下调mi R-9-5p可降低细胞活力、促进凋亡。(2)miR-9-5p靶向HIC1,两者的表达呈负相关。(3)抑制HIC1的表达,可逆转miR-9-5p下调的作用。结论:miR-9-5p可通过下调HIC1降低乳腺癌细胞对多柔比星的敏感性。展开更多
目的:通过建立血浆游离DNA中肿瘤高甲基化基因1(hypermethylated in cancer 1, HIC-1)甲基化检测技术,评估其作为体液活检诊断方法在乳腺良恶性疾病鉴别中的价值。方法:收集35份乳腺疾病患者(其25例乳腺癌,10例乳腺良性疾病)及10份健康...目的:通过建立血浆游离DNA中肿瘤高甲基化基因1(hypermethylated in cancer 1, HIC-1)甲基化检测技术,评估其作为体液活检诊断方法在乳腺良恶性疾病鉴别中的价值。方法:收集35份乳腺疾病患者(其25例乳腺癌,10例乳腺良性疾病)及10份健康志愿者的血液样本,分离、提取血浆中的游离DNA。采用亚硫酸氢盐测序(bisulfite sequencing PCR,BSP)法,检测HIC-1基因启动子区域-636～-424 bp中16个CpG位点的甲基化水平。结果:在检测的16个CpG位点中,以-636～-617 bp中的4个位点甲基化最为明显。其中,乳腺癌组的这4个位点平均甲基化率为22.6%,而良性乳腺疾病组为8.5%,健康对照组为8.3%,3组间的差异有统计学意义(P<0.05)。进一步绘制受试者工作特征曲线(receiver operator characteristic curve, ROC曲线)进行分析,发现以这4个位点的平均甲基化率诊断乳腺癌时,其曲线下面积(area under the cure AUC)为0.794,证实其对乳腺癌具有一定的诊断价值。结论:检测血浆游离DNA中抑癌基因HIC-1启动子区甲基化水平,在乳腺癌诊断中有一定参考价值。展开更多
In this paper, three robust zero-watermark algorithms named Direct Current coefficient RElationship (DC-RE), CUmulant combined Singular Value Decomposition (CU-SVD), and CUmulant combined Singular Value Decomposition ...In this paper, three robust zero-watermark algorithms named Direct Current coefficient RElationship (DC-RE), CUmulant combined Singular Value Decomposition (CU-SVD), and CUmulant combined Singular Value Decomposition RElationship (CU-SVD-RE) are proposed. The algorithm DC-RE gets the feature vector from the relationship of DC coefficients between adjacent blocks, CU-SVD gets the feature vector from the singular value of third-order cumulants, while CU-SVD-RE combines the essence of the first two algorithms. Specially, CU-SVD-RE gets the feature vector from the relationship between singular values of third-order cumulants. Being a cross-over studying field of watermarking and cryptography, the zero-watermark algorithms are robust without modifying the carrier. Numerical simulation obviously shows that, under geometric attacks, the performance of CU-SVD-RE and DC-RE algorithm are better and all three proposed algorithms are robust to various attacks, such as median filter, salt and pepper noise, and Gaussian low-pass filter attacks.展开更多
Under the acceptable hypothesis that cardiac rhythm is an approximately deterministic process with a small scale noise component, an available way is provided to construct a model that can reflect its prominent dynami...Under the acceptable hypothesis that cardiac rhythm is an approximately deterministic process with a small scale noise component, an available way is provided to construct a model that can reflect its prominent dynamics of the deterministic component. When applied to the analysis of 19 heart rate data sets, three main findings are stated. The obtained model can reflect prominent dynamics of the deterministic component of cardiac rhythm; cardiac chaos is stated in a reliable way; dynamical noise plays an important role in the generation of complex cardiac rhythm.展开更多
文摘目的:探讨微小RNA-9-5p(mi R-9-5p)调控肿瘤高甲基化基因1(hypermethylated in cancer 1,HIC1)对乳腺癌MDA-MB-231细胞对化疗药多柔比星敏感性的影响及其作用机制。方法:(1)使用慢病毒转染建立上调或下调mi R-9-5p细胞,加入不同浓度多柔比星后,用CCK-8和流式细胞仪检测细胞活力和凋亡情况。(2)通过反转录-聚合酶链反应(reverse transcription-polymerase chain reaction,RT-PCR)和蛋白质印迹试验检测上调或下调miR-9-5p时HIC1的表达情况。通过数据库资料、双荧光素酶报告基因系统验证miR-9-5p与HIC1的关系。(3)下调HIC1,观察加入多柔比星后细胞活力和凋亡情况。结果:(1)上调miR-9-5p可提高细胞活力、抑制凋亡。下调mi R-9-5p可降低细胞活力、促进凋亡。(2)miR-9-5p靶向HIC1,两者的表达呈负相关。(3)抑制HIC1的表达,可逆转miR-9-5p下调的作用。结论:miR-9-5p可通过下调HIC1降低乳腺癌细胞对多柔比星的敏感性。
文摘目的:通过建立血浆游离DNA中肿瘤高甲基化基因1(hypermethylated in cancer 1, HIC-1)甲基化检测技术,评估其作为体液活检诊断方法在乳腺良恶性疾病鉴别中的价值。方法:收集35份乳腺疾病患者(其25例乳腺癌,10例乳腺良性疾病)及10份健康志愿者的血液样本,分离、提取血浆中的游离DNA。采用亚硫酸氢盐测序(bisulfite sequencing PCR,BSP)法,检测HIC-1基因启动子区域-636～-424 bp中16个CpG位点的甲基化水平。结果:在检测的16个CpG位点中,以-636～-617 bp中的4个位点甲基化最为明显。其中,乳腺癌组的这4个位点平均甲基化率为22.6%,而良性乳腺疾病组为8.5%,健康对照组为8.3%,3组间的差异有统计学意义(P<0.05)。进一步绘制受试者工作特征曲线(receiver operator characteristic curve, ROC曲线)进行分析,发现以这4个位点的平均甲基化率诊断乳腺癌时,其曲线下面积(area under the cure AUC)为0.794,证实其对乳腺癌具有一定的诊断价值。结论:检测血浆游离DNA中抑癌基因HIC-1启动子区甲基化水平,在乳腺癌诊断中有一定参考价值。
基金Supported by the National Natural Science Foundation of China (No. 60672095, 60972165, and 61071111)the National High Technology Project of China (No. 2007AA-11Z210)+2 种基金the Doctoral Fund of Ministry of Education of China (No. 20100092120012 and 20070286004)the Foundation of High Technology Project in Jiangsu Provincethe Natural Science Foundation of Jiangsu Province (No.BK2010240)
文摘In this paper, three robust zero-watermark algorithms named Direct Current coefficient RElationship (DC-RE), CUmulant combined Singular Value Decomposition (CU-SVD), and CUmulant combined Singular Value Decomposition RElationship (CU-SVD-RE) are proposed. The algorithm DC-RE gets the feature vector from the relationship of DC coefficients between adjacent blocks, CU-SVD gets the feature vector from the singular value of third-order cumulants, while CU-SVD-RE combines the essence of the first two algorithms. Specially, CU-SVD-RE gets the feature vector from the relationship between singular values of third-order cumulants. Being a cross-over studying field of watermarking and cryptography, the zero-watermark algorithms are robust without modifying the carrier. Numerical simulation obviously shows that, under geometric attacks, the performance of CU-SVD-RE and DC-RE algorithm are better and all three proposed algorithms are robust to various attacks, such as median filter, salt and pepper noise, and Gaussian low-pass filter attacks.
基金This work was supported by the National Natural Science Foundation of China (Grant Nos. 69735101 and 69872009).
文摘Under the acceptable hypothesis that cardiac rhythm is an approximately deterministic process with a small scale noise component, an available way is provided to construct a model that can reflect its prominent dynamics of the deterministic component. When applied to the analysis of 19 heart rate data sets, three main findings are stated. The obtained model can reflect prominent dynamics of the deterministic component of cardiac rhythm; cardiac chaos is stated in a reliable way; dynamical noise plays an important role in the generation of complex cardiac rhythm.
