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学科主题: 临床医学
题名:
The different biological effects of single, fractionated and continuous low dose rate irradiation on CL187 colorectal cancer cells
作者: Wang, Hao1; Li, Jinna1; Qu, Ang1; Liu, Jingjia1; Zhao, Yong2; Wang, Junjie1
关键词: I-125 seeds ; CL187 cell ; DNA repair
刊名: RADIATION ONCOLOGY
发表日期: 2013-08-09
DOI: 10.1186/1748-717X-8-196
卷: 8
收录类别: SCI
文章类型: Article
WOS标题词: Science & Technology
类目[WOS]: Oncology ; Radiology, Nuclear Medicine & Medical Imaging
研究领域[WOS]: Oncology ; Radiology, Nuclear Medicine & Medical Imaging
关键词[WOS]: RECURRENT RECTAL-CANCER ; IN-VITRO ; PROTEIN EXPRESSION ; RATE RADIATION ; I-125 ; APOPTOSIS ; IMPLANTATION ; RADIOTHERAPY ; THERAPY ; REPAIR
英文摘要:

Purpose: To determine the biological effectiveness of single, fractionated and continuous low dose rate irradiation on the human colorectal cancer cell line CL187 in vitro and explore the cellular mechanisms.

Materials and methods: The CL187 cells were exposed to radiation of 6 MV X-ray at a high dose rate of 4Gy/min and I-125 seed at a low dose rate of 2.77 cGy/h. Three groups were employed: single dose radiation group (SDR), fractionated dose radiation group (FDR) by 2Gy/f and continuous low dose rate radiation group (CLDR). Four radiation doses 2, 4, 6 and 8Gy were chosen and cells without irradiation as the control. The responses of CL187 cells to distinct modes of radiation were evaluated by the colony-forming assay, cell cycle progression as well as apoptosis analysis. In addition, we detected the expression patterns of DNA-PKcs, Ku70 and Ku80 by Western blotting.

Results: The relative biological effect for I-125 seeds compared with 6 MV X-ray was 1.42. 48 hrs after 4Gy irradiation, the difference between proportions of cells at G2/M phase of SDR and CLDR groups were statistically significant (p = 0.026), so as the FDR and CLDR groups (p = 0.005). 48 hrs after 4Gy irradiation, the early apoptotic rate of CLDR group was remarkably higher than SDR and FDR groups (CLDR vs. SDR, p = 0.001; CLDR vs. FDR, p = 0.02), whereas the late apoptotic rate of CLDR group increased significantly compared with SDR and FDR group (CLDR vs. SDR, p = 0.004; CLDR vs. FDR, p = 0.007). Moreover, DNA-PKcs and Ku70 expression levels in CLDR-treated cells decreased compared with SDR and FDR groups.

Conclusions: Compared with the X-ray high dose rate irradiation, I-125 seeds CLDR showed more effective induction of cell apoptosis and G2/M cell cycle arrest. Furthermore, I-125 seeds CLDR could impair the DNA repair capability by down-regulating DNA-PKcs and Ku70 expression.

语种: 英语
所属项目编号: 81071834
项目资助者: National Science Foundation of China
WOS记录号: WOS:000323132600001
Citation statistics:
内容类型: 期刊论文
URI标识: http://ir.bjmu.edu.cn/handle/400002259/53885
Appears in Collections:北京大学第三临床医学院_肿瘤放疗科_期刊论文

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作者单位: 1.Peking Univ, Hosp 3, Dept Radiat Oncol, Beijing 100191, Peoples R China
2.Chinese Acad Sci, Transplantat Biol Res Div, State Key Lab Biomembrane & Membrane Biotechnol, Inst Zool, Beijing, Peoples R China

Recommended Citation:
Wang, Hao,Li, Jinna,Qu, Ang,et al. The different biological effects of single, fractionated and continuous low dose rate irradiation on CL187 colorectal cancer cells[J]. RADIATION ONCOLOGY,2013,8.
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