人卵巢癌细胞株侧群细胞的生物学特征

目的 研究人卵巢癌细胞株细胞中乳腺癌耐药蛋白与侧群细胞表型的关系,并探讨侧群细胞在卵巢癌病理牛理中的作用以及卵巢癌细胞株在卵巢癌肿瘤干细胞研究中的应用. 方法 利用流式细胞术从人卵巢浆液腺癌细胞株OVCAR3中分离排斥双苯酰亚胺(Hoechst 33342)染色的侧群细胞以及能被其染色的非侧群细胞,比较两个亚群的细胞集落形成率,并检验其在软琼脂平板生长的能力.同时以免疫印迹和免疫荧光染色检测两种细胞的乳腺癌耐药蛋白表达情况. 结果 OVCAR3细胞株中排斥Hoechst 33342的细胞占2.0%,此活动对维拉帕米(verapamil)敏感.侧群细胞和非侧群细胞克隆形成率分别为46.17%±23.27%和6.17%±3.06%,侧群细胞克隆形成率高于非侧群细胞(P<0.05),并能在软琼脂平板中生长、形成球形的细胞集落.侧群细胞表达乳腺癌耐药蛋白. 结论 人卵巢浆液腺癌细胞株中存在排斥Hoechst 33342染色、对维拉帕米敏感的侧群细胞,是维持细胞株的主要因素,其表型与乳腺癌耐药蛋白相关.OVCAR3可用于卵巢癌肿瘤干细胞的研究.

Biological characteristics of the side population of human ovarian epithelial cancer cell line

Objectives Existence of side population (SP) in human ovarian cancer cell line OVCAR3 and characteristics of both stem cells and cancer cells were detected. Relation between SP phenotype and ABCG2 protein( ATP-binding cassette superfamily G member 2/breast cancer resistance protein, BCRP) was examined,and the potential to use OVCAR3 as tools for investigating the characteristics of cancer stem cells (CSCs)was estimated as well. Methods Hoechst 33342 efflux SP cells and dye-uptaking non-SP cells were separated by flow cytometry from human serous ovarian adenocarcinoma cell line OVCAR3. Cell colonyforming efficiency (CFE) of both subgroups ware evaluated. Soft agar assay was performed to compare the growth capacity of SP cells and non-SP cells. ABCG2 expression was detected by Western blotting and immunofluoreacence using an anti-ABCG2 monoclonal antibody. Results Flow cytometric analysis confirmed the presence of small subpopulations of cells excluding Hoechst dye in OVCAP,3 cells (2. 0% ) in a verapamil-sensitive manner. Hoechst dye uptake in OVCAR3 cells was enhanced by addition of verapamil, consistent with activity of ABCG2 protein. CFE of both SP and non-SP was 46.17%±23.27% and 6.17%±3.06%, respectively(P<0. 05). The Hoechst dye excluding SP cells exhibited immunoreactivity to stem cell markers ABCG2, demonstrated by Western blotting. They could grow in soft agar plate and formed cell sphere. Conclusions Human epithelial ovarian carcinoma cell line OVCAR3 contains a small subpoptdation of cells that exhibits a cancer stem cell-like phenotype. Special significance is the expression of ABCG2 in human tumor cells, a calcium-sensitive cell surface protein that acts to exclude Hoechst dye. These cells play a principal role in maintaining cancer cell line. It can be seen that cancer cell lines are potentially useful tools for investigating the characteristics of CSCs under controlled experimental conditions.