Objective To investigate the anti-tumor effect and mechanism of tamoxifen on rat C6 glioma cells. Methods C6 cells were cultured in Dulbecco’s modified Eagle’s medium (DMEM) with 3% fetal calf serum (FCS), and treat...Objective To investigate the anti-tumor effect and mechanism of tamoxifen on rat C6 glioma cells. Methods C6 cells were cultured in Dulbecco’s modified Eagle’s medium (DMEM) with 3% fetal calf serum (FCS), and treated with tamoxifen of different concentrations, i.e. group A (1.25μmol/L), group B (2.50 μmol/L), group C (5.00 μmol/L), group D (10.00 μmol/L), group E (20.00 μmol/L) and control group (0.00 μmol/L). Morphological changes, MTT assay and 5-bromo-2’-deoxyuriding labeling ratio were assessed. Apoptosis was observed by flow cytometry. Results C6 cells treated with different doses of tamoxifen for 24, 48, and 72 hours became irregular in shape, while cells treated with vehicle grew normally. MTT assay showed that tamoxifen did not suppress C6 cell growth until 72 hours after treatment. Seventy-two hours after treatment, there were significant differences in cell viable rate between group A versus groups C, D and E; so did group B versus group D as well as group E (P<0.05). BrdU incorporation assay indicated significant difference of BrdU labbled index (BrdU LI) among groups A, C, E and control group 48 hours after treatment (P<0.05). And the BrdU LI decreased with the increased concentration of tamoxifen. Flow cytometry (FCM) showed significant difference between treated group and control group at 24, 48, and 72 hours after treatment (P<0.05). Conclusion Tamoxifen significantly suppresses the growth of C6 glioma cells in a time-and dose-dependent manner. The mechanism of tamoxifen suppressing C6 glioma cells may be inhibiting proliferation and inducing apoptosis. Therefore, tamoxifen can be a candidate as a chemotherapy agent for glioma.展开更多
目的探讨Period2(Per2)基因对细胞生长及放射敏感性的影响。方法体外培养C6神经胶质瘤细胞(C6g liom a ce lls),使用脂质体包裹法将Per2表达质粒(pcDNA3.1-Per2)转导入C6细胞内;以免疫组化及流式细胞术检测Per2表达;通过流式细胞术和克...目的探讨Period2(Per2)基因对细胞生长及放射敏感性的影响。方法体外培养C6神经胶质瘤细胞(C6g liom a ce lls),使用脂质体包裹法将Per2表达质粒(pcDNA3.1-Per2)转导入C6细胞内;以免疫组化及流式细胞术检测Per2表达;通过流式细胞术和克隆形成试验检测稳定转染Per2阳性表达的C6细胞在正常情况下和γ射线照射后的凋亡、生长。结果未经γ射线照射的Per2阳性表达的C6细胞较对照组细胞增殖减慢、凋亡率增加,但γ射线照射后的较对照组细胞增殖速度快、凋亡率减少。结论节律基因Per2过表达会增加肿瘤细胞的凋亡,但在射线照射情况下会降低肿瘤细胞对射线的敏感性。展开更多
文摘Objective To investigate the anti-tumor effect and mechanism of tamoxifen on rat C6 glioma cells. Methods C6 cells were cultured in Dulbecco’s modified Eagle’s medium (DMEM) with 3% fetal calf serum (FCS), and treated with tamoxifen of different concentrations, i.e. group A (1.25μmol/L), group B (2.50 μmol/L), group C (5.00 μmol/L), group D (10.00 μmol/L), group E (20.00 μmol/L) and control group (0.00 μmol/L). Morphological changes, MTT assay and 5-bromo-2’-deoxyuriding labeling ratio were assessed. Apoptosis was observed by flow cytometry. Results C6 cells treated with different doses of tamoxifen for 24, 48, and 72 hours became irregular in shape, while cells treated with vehicle grew normally. MTT assay showed that tamoxifen did not suppress C6 cell growth until 72 hours after treatment. Seventy-two hours after treatment, there were significant differences in cell viable rate between group A versus groups C, D and E; so did group B versus group D as well as group E (P<0.05). BrdU incorporation assay indicated significant difference of BrdU labbled index (BrdU LI) among groups A, C, E and control group 48 hours after treatment (P<0.05). And the BrdU LI decreased with the increased concentration of tamoxifen. Flow cytometry (FCM) showed significant difference between treated group and control group at 24, 48, and 72 hours after treatment (P<0.05). Conclusion Tamoxifen significantly suppresses the growth of C6 glioma cells in a time-and dose-dependent manner. The mechanism of tamoxifen suppressing C6 glioma cells may be inhibiting proliferation and inducing apoptosis. Therefore, tamoxifen can be a candidate as a chemotherapy agent for glioma.
文摘目的探讨Period2(Per2)基因对细胞生长及放射敏感性的影响。方法体外培养C6神经胶质瘤细胞(C6g liom a ce lls),使用脂质体包裹法将Per2表达质粒(pcDNA3.1-Per2)转导入C6细胞内;以免疫组化及流式细胞术检测Per2表达;通过流式细胞术和克隆形成试验检测稳定转染Per2阳性表达的C6细胞在正常情况下和γ射线照射后的凋亡、生长。结果未经γ射线照射的Per2阳性表达的C6细胞较对照组细胞增殖减慢、凋亡率增加,但γ射线照射后的较对照组细胞增殖速度快、凋亡率减少。结论节律基因Per2过表达会增加肿瘤细胞的凋亡,但在射线照射情况下会降低肿瘤细胞对射线的敏感性。
