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Wang J, Wang W, Guo Y, Jing SW, Shang K, Miao MC, Wang J, Wu YJ, Liu LN, Yu JM. [Effects and its mechanism of Nimotuzumab on radiosensitivity of esophageal carcinoma ECA-109 and TE-13 cell lines]. Zhonghua Zhong Liu Za Zhi 2017; 38:732-738. [PMID: 27784455 DOI: 10.3760/cma.j.issn.0253-3766.2016.10.004] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
Objective: To investigate the effects of nimotuzumab on radiosensitivity of ECA-109 and TE-13 esophageal carcinoma cell lines and explore its possible mechanism. Methods: The ECA-109 and TE-13 cells were divided into control group, irradiation group, medicine group, and combined group (irradiation + medicine). In the combined group, ECA-109 and TE-13 cells were treated with nimotuzumab for 24 h before irradiation, and the cells were collected 2 h after irradiation. The radiosensitizing effects of nimotuzumab on ECA-109 and TE-13 cells were evaluated by clone formation assay. Cell apoptosis was detected by flow cytometry. Western blotting was used to evaluate the expression of EGFR, p-EGFR, DNA-PKcs, p-DNA-PKcs and γH2AX. Results: The values of Dq (quasithreshold dose), D0(mean lethal dose)and SF2 (surviving fraction at 2 Gy) of ECA-109 and TE-13 cells in the combined group were significantly lower than those of the radiation group (for ECA-109 cells, 1.11 vs. 1.72, 1.40 vs. 2.14, 0.42 vs. 0.66, respectively; for TE-13 cells, 0.41 vs. 0.46, 0.43 vs. 0.65, 0.40 vs. 0.71, respectively (all P<0.05). The sensitivity enhancement ratio (SER) of ECA-109 and TE-13 cells were 1.35 and 1.43, respectively. Flow cytometry showed that the apoptosis rate of ECA-109 and TE-13 cells in the combined group were significantly higher than those of the radiation group [for ECA-109 cells, (41.31±1.52)% vs. (9.54±0.52)%; for TE-13 cells, (46.28±0.28)% vs. (11.32±0.31)%, both P<0.01]. Western blotting showed that the expression levels of EGFR and DNA-PKcs were not significantly different in all groups (all P>0.05). Compared with those of the control group, p-EGFR and p-DNA-PKcs of the radiation group were significantly higher in both cell lines (P<0.05), and the γH2AX levels in the radiation group and medicine group were significantly higher than that of the control group (P<0.05). Compared with those of the radiation group and medicine group, p-EGFR and p-DNA-PKcs protein expression in the combined group were decreased significantly (P<0.05), while γH2AX protein expression was significantly increased (P<0.05). Conclusions: Nimotuzumab can enhance the radiosensitivity of esophageal cancer ECA-109 and TE-13 cells. The potential mechanism may be related to the inhibition of EGFR phosphorylation and down-regulation of DNA damage repair proteins. The radiosensitizing effect of nimotuzumab is greater on poorly differentiated esophageal cancer cells.
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Affiliation(s)
- J Wang
- Department of Radiation Oncology, Tianjin Medical University Cancer Institute & Hospital, Tianjin 300070, China (Present Unit: Department of Radiation Oncology, the Fourth Hospital of Hebei Medical University, Shijiazhuang 050011, China); Department of Radiation Oncology, the Fourth Hospital of Hebei Medical University, Shijiazhuang 050011, China
| | - W Wang
- Department of Radiation Oncology, the Fourth Hospital of Hebei Medical University, Shijiazhuang 050011, China
| | - Y Guo
- Department of Radiation Oncology, the Fourth Hospital of Hebei Medical University, Shijiazhuang 050011, China
| | - S W Jing
- Department of Radiation Oncology, the Fourth Hospital of Hebei Medical University, Shijiazhuang 050011, China
| | - K Shang
- Department of Radiation Oncology, the Fourth Hospital of Hebei Medical University, Shijiazhuang 050011, China
| | - M C Miao
- Department of Radiation Oncology, the Fourth Hospital of Hebei Medical University, Shijiazhuang 050011, China
| | - J Wang
- Department of Radiation Oncology, the Fourth Hospital of Hebei Medical University, Shijiazhuang 050011, China
| | - Y J Wu
- Department of Radiation Oncology, the Fourth Hospital of Hebei Medical University, Shijiazhuang 050011, China
| | - L N Liu
- Department of Radiation Oncology, the Fourth Hospital of Hebei Medical University, Shijiazhuang 050011, China
| | - J M Yu
- Department of Radiation Oncology, Shandong Cancer Hospital, Jinan 250117, China
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