MicroRNA-328-3p facilitates the progression of gastric cancer via KEAP1/NRF2 axis.

Gastric cancer is a common lethal malignancy and causes great cancer-related mortality worldwide. MicroRNA (miR)-328-3p is implicated in the progression of various human cancers; however, its role and mechanism in the progression of gastric cancer remain unclear.Human gastric cancer cells were incubated with miR-328-3p mimic, inhibitor or the matched negative control. Cell viability, colony formation, migrative and invasive capacity, cell apoptosis and oxidative stress were measured. To clarify the involvement of nuclear factor-E2-related factor 2 (NRF2) and kelch-like ECH-associated protein 1 (KEAP1), small interfering RNA was used. miR-328-3p was upregulated in human gastric cancer cells and tissues, and its level positively correlated with the progression of gastric cancer. miR-328-3p promoted cell viability, colony formation, migration and invasion, thereby facilitating the progression of gastric cancer. miR-328-3p mimic reduced, while miR-328-3p inhibitor increased apoptosis and oxidative stress of human gastric cancer cells. Mechanistically, miR-328-3p upregulated NRF2 via targeting KEAP1to attenuate excessive free radical production and cell apoptosis. miR-328-3p functions as an oncogenic gene and inhibiting miR-328-3p may help to develop novel therapeutic strategies of human gastric cancer.

XPG Asp1104His polymorphism and gastrointestinal cancers risk: a meta-analysis.

Several studies have reported the association between the Asp1104His polymorphism in xeroderma pigmentosum group G (XPG) gene and risk of gastrointestinal cancers. However, the results are inconsistent. This meta-analysis was performed to assess the association between XPG Asp1104His polymorphism and gastrointestinal cancers risk. Relevant studies were identified using PubMed, Web of Science, CNKI, WanFang and VIP databases up to July 22, 2014. The pooled odds ratio (OR) with a 95% confidence interval (CI) was calculated using the fixed- or random effects model. 13 case-control studies from twelve publications with 4275 patients and 5735 controls were included. Overall, a significant association was found between the XPG Asp1104His polymorphism and the risk of gastrointestinal cancers (dominant model: OR = 1.15, 95% CI: 1.05-1.26; His/His vs. Asp/Asp: OR = 1.15, 95% CI: 1.01-1.32). When the analysis was stratified by ethnicity, similar results were observed in Asians under homozygote model; in stratification analysis by cancer type, increased cancer risk was detected in colorectal and hepatocellular carcinoma, but not for other gastrointestinal cancers. Furthermore, in subgroup analysis by source of control, we failed to detect any association among population, hospital and family-based populations. This meta-analysis indicated that the XPG Asp1104His polymorphism may be a risk factor for gastrointestinal cancers, especially of colorectal cancer.

[Radiobiological characteristics and MRN complex expression of human nasopharyngeal carcinoma cell lines].

OBJECTIVE: To study the radiobiological characteristic of human nasopharyngeal carcinoma cell lines CNE1 and CNE2 and the changes in expression MRN (Mre11-Rad50-Nbs1) complex in the cell lines exposed to irradiation. METHODS: CNE1 and CNE2 were irradiated by a linear accelerator. Radiobiological characteristics were detected by colony assay and MTT assay. MRN complex expression were examined by Western blot. RESULTS: Surviving fraction at 2 Gy (SF2), quasi-threshold Dose (Dq), and mean lethal dose (Do) of CNE1 were 0.56, 1.449 Gy and 1.480 Gy; SF2, Dq, and Do of CNE2 were 0.44, 0.776 Gy and 1.685 Gy, respectively. Survival fraction of CNE1 at the day 6 after 4 Gy irradiation was 0.59 and that of CNE2 was 0.79 when compared with control, with the up-regulated expressions of Rad50 in CNE1 and Mre11, Rad50 and Nbs1 in CNE2 (P < 0.05). CONCLUSIONS: CNE1 and CNE2 were sensitive to radiation, but there were radioresistance cells in CNE2. The expressions of some components of MRN complex were up-regulated to repair DNA lesions induced by radiation.

The role of prophylactic antibiotics in laparoscopic cholecystectomy in preventing postoperative infection: a meta-analysis.

BACKGROUND: Although laparoscopic cholecystectomy (LC) is a common and widely applied technique, the use of antibiotics during the perioperative period in infection prevention remains controversial. In our study, a meta-analysis was performed to assess the impact of antibiotic prophylaxis on the postoperative infection rate in LC. METHODS: A literature search was conducted on studies published between January 1966 and March 2010 that involved LC and prophylactic administration of antibiotics. Only randomized trials that compared perioperative antibiotic prophylaxis with placebo or no treatment in low-risk patients undergoing LC were selected. Eighteen studies qualified according to the inclusion criteria, but only 12 were of adequate quality according to the Jadad scale to be included for the meta-analysis. Data were analyzed via the Peto odds ratio (OR) method and run using RevMan 4.2 software. The precision of the estimation of OR by individual studies was used to calculate their contribution (or weighting) to the pooled OR. RESULTS: The results of the 12 studies did not have significant heterogeneity, and thus, the fixed effect model was used for data analysis. Compared with placebo or no treatment, there was no significant risk reduction in the antibiotic prophylaxis group with regard to overall infections (OR=1.11; 95% confidence interval [CI], 0.68-1.82; P=.67), wound infections (OR=1.07; 95% CI, 0.59-1.94; P=.99), major infections (OR=2.88; 95% CI, 0.3-28.09; P=.36), distant infections (OR=1.01; 95% CI, 0.43-2.36; P=.99), or positive bile cultures (OR=0.76; 95% CI, 0.54-1.08; P=.12). However, prophylactic antibiotics did shorten length of hospital stay (weighted mean difference=-0.16; 95% CI, -0.22 to -0.09; P<.01). CONCLUSION: Prophylactic antibiotics are not necessary for elective LC in low-risk patients.