In this study,CD133+ subpopulations were isolated from 41 primary colorectal cancer tissues,the proliferation and cell cycle distribution of the cells were examined without in vitro expansion,and then compared to those of cell lines.The detection of CD133 in colorectal cancer tissues,isolation of CD133+ and CD133-epithelial subpopulations,Ki-67/DNA multiparameter assay and cell volume analysis were flow cytometrically conducted.The results showed that Ki-67 expression was correlated with CD133 level in primary cancer tissues,while cell cycle G 2 /M phase distribution or clinicopathological characteristics was not.In addition,the CD133+ cells showed larger cell volume and higher Ki-67 expression as compared with CD133-cells.But there was no statistically significant difference in G 2 /M phase distribution between the two subpopulations.Our results demonstrated that the CD133+ subpopulation in colorectal cancer tissue contained more actively cycling and proliferating cells,which was not correlated to clinicopathological factors but might contribute to tumor progression and poor clinical outcome.
Objective: To study the relationship between the expression of human cyclin B1 in colorectal carcinomas and the pathological characters. Methods: The Expression of cyclin B1 in 66 cases of colorectal carcinomas were detected by flow cytometry and immunohistochemistry. Then the relationship between the expression of cyclin B1 in colorectal carcinomas and pathological characters was analyzed with statistics. Results: The expression of cyclin B1 in colorectal carcinomas had associa- tivity with the cancer cell differentiation (P<0.05); However, the expression of cyclin B1 in colorectal carcinomas had no obvious associativity with cancer cell infiltrate depth and lymph nodes metastasis (P>0.05). Conclusion: In the colorectal cancers with high expression of cyclin B1, the cancer cells would present high differentiation; with low expression of cyclin B1 the cancer cells would present low differentiation. Along with the expression of cyclin B1 from high to low, the cancer cells differentiation has the tendency from high to low too.
Haocheng Long Xia Gao Xiaoyan Chen Xiaolan Li Xiaojun He Deding Tao Jianping Gong
背景与目的:膀胱尿路上皮癌是我国泌尿生殖系统常见的恶性肿瘤。本研究旨在分析中国人膀胱尿路上皮癌中染色体畸变的情况,探讨多色荧光原位杂交(multicolor fluorescence in situ hybridization,M-FISH)技术辅助诊断膀胱尿路上皮癌的可行性和有效性。方法:用随机引物法标记3、7、17号染色体着丝粒及9p21区带探针,对57例膀胱尿路上皮癌间期细胞核进行荧光原位杂交(fluorescence in situ hybridization,FISH),统计染色体畸变情况并分析其与病理分期、分级的关系以及染色体畸变组合诊断膀胱尿路上皮癌的阳性率。结果:3、7、17号染色体和9p21的畸变率分别为47.4%(27/57)、50.9%(29/57)、56.1%(32/57)和59.6%(34/57),畸变与分期无相关性,3、7和17号染色体畸变与病理分级有显著相关性(P<0.01)。四个探针组合诊断膀胱尿路上皮癌的总阳性率为54.4%。结论:M-FISH技术检测有助于探索3、7、17号染色体畸变与病理分级的关系。
Objective： We investigated the influence of CDK1 and CDK2 expression inhibited by cotransfection of CDK1 and CDK2 siRNA on cell cycle and apoptosis, explored the exact role of cell cycle master regulator in tumor cell apoptosis process. Methods： The siRNA targeting the CDK1 and CDK2 genes were synthesized and simultaneously cotransfected into Hela cells by lipofectamine 2000.48 or 60 h after the cotransfection, CDK1 and CDK2 protein expressions were examined by Western blot. Cell cycle distribution was analyzed by flow cytometry. Cell apoptosis was detected by the Annexin V/PI method. The changes of the transfected cell morphological under a microscope after Wright-Giemsa Staining were studied. Results： CDK1 and CDK2 protein expression was decreased at 48 or 60 h after cotransfection. The accumulation of the G2/M and S phase population in cell cycle of the cotransfected cells at 48 or 60 h after transfection was enhanced obviously compared with control. The ratio of apoptotic cell of cotransfected cells at 48 or 60 h after transfection was increased significantly compared with control. More binucleate or multinucleate ceJls among cotransfected cells were observed under the microscope. Conclusion： The decreased expression of CDK1 and CDK2 by cotransfection of CDK1 and CDK2 siRNA not only leads to tumor cell cycle arrest in S phase and G2/M phase, but also induces tumor cell apoptosis.
Hui Xiao Wanjun Gong Jingpeng Cao Xiaolan Li Deding Tao Junbo Hu Jianping Gong
