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Objective To investigate the effect of Zinc finger E-box binding homeobox protein 1 (ZEB1) on the radiosensitivity of gastric cancer cells AGS and its possible mechanism. Methods AGS cells were irradiated by X-rays at different doses (0, 2, 4, 6, and 8 Gy). Western blot was used to observe the expression of ZEB1 in cells. AGS cells, in logarithmic growth phase, were transfected with of ZEB1 gene or its interference plasmids, the corresponding control plasmids ( pcDNA3. 1 ) and negative control interference plasmids. They were classified as overexpression ZEB1 group, silencing ZEB1 group, control group and negative control group, respectively. The effect of overexpression and silencing ZEB1 on the survival of AGS cells after irradiation were analyzed by colony formation assay. The cell apoptosis rate was analyzed by flow cytometry. The expressions of histone H2A (H2AX), phosphorylated H2AX (γ-H2AX) and telangiectasia mutated gene (ATM) were detected by Western blot. Results The expression of ZEB1 in AGS cells was dependent on radiation dose (F=58. 57, P<0. 05). Overexpression of ZEB1 increased AGS cells viability, inhibitedγ-H2AX expression (t=12. 18, P<0. 05), blocked cell apoptosis (t=7. 27, P<0. 05) and up-regulated ATM expression in time-dependent manner after irradaition (F=165. 70, P <0. 05). Silencing ZEB1 reduced AGS cells viability, increased γ-H2AX expression ( t =12. 88, P<0. 05) and cell apoptosis (t =8. 36, P <0. 05), and down-regulated of ATM expression (F=44. 80, P<0. 05). Conclusions ZEB1 regulates the radiosensitivity of gastric cancer AGS cells by up-regulating ATM expression.
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This paper aims to determine the expression and clinical significance of DDX43 in lung adenocarcinoma. Expression of DDX43 gene and protein of lung adenocarcinoma tissue and para-carcinoma tissues was observed in 27 cases by RT-PCR and immunohistochemistry. These patients were diagnosed as lung adenocarcinoma in the Huaihe Hospital of Henan University from February 2015 to December 2015. The relative ratio of DDX43 mRNA expression in lung adenocarcinoma and para-carcinoma tissues was 0.87+/- 0.62 versus 0.21+/- 0.77 and the difference between the two groups was statistically significant [P<0.01]. The expression of DDX43 in normal lung tissues and lung adenocarcinoma tissues was different. The positive rate of DDX43 expression in lung adenocarcinoma tissues was significantly higher than that in normal lung tissues, and the difference was statistically significant [P<0.05]. The analysis of clinical pathological characteristics showed that the increase of protein expression was related to the stage and metastasis of lung adenocarcinoma. DDX43 is highly expressed in lung adenocarcinoma, and the expression level is related to the stage and metastasis of lung adenocarcinoma, suggesting that DDX43 is closely related to the occurrence and development of lung adenocarcinoma, and may be a molecular marker for early diagnosis of lung adenocarcinoma
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Objective To explore the expression of miR-146a and its target gene LIN52 in advanced gastric cancer and their potential impact on clinical prognosis.Methods Total RNAs were extracted from 93gastric cancer tissues and their corresponding adjacent non-tumor tissues to quantify the relative expression of miR-146a by using real-time quantitative PCR (RT-qPCR).Expression of LIN52 was detected in tumors and normal tissues by immunohistochemistry.Correlation analysis was assessed between the expression of miR-146a and LIN52 and clinicopathological parameters,including clinical diagnostic specificity,tumor TNM staging,lymph node metastasis,differentiation grade,curative effect and prognosis of gastric cancer.Results The expression of miR-146a in gastric carcinoma was negatively correlated with lymph node metastasis (P ＜0.05).The expression of miR-146a had a significant correlation with the prognosis of the patients (P ＜ 0.01).The patients with high expression of miR-146a had higher survival rate (P ＜ 0.05),but the patients with high expression of LIN52 had lower survival rate (P ＜ 0.05).The receiver operating characteristic curve regression analysis showed that sensitivity and specificity of miR-146a were 94.1％ and 61.5 ％ to diagnose gastric cancer.Conclusions As a tumor suppressor gene in gastric cancer,miR-146a has significantly negative correlation with LIN52.High expression of miR-146a in the gastric cancer tissue might be associated with improved treatment efficacy of chemotherapy,suggesting that miR-146a may be a molecular marker for the diagnosis and prognosis of gastric cancer.