RESUMO
Objective:To investigate the expression of monoubiquitination histone H2B (H2Bub) in esophageal cancer tissues and its correlation with the prognosis of patients.Methods:A total of 75 patients who underwent thoracic esophagectomy in Shanxi Province Cancer Hospital from May 2010 to December 2015 were selected. The expression of H2Bub protein in esophageal carcinoma and para-carcinoma tissues was detected by using immunohistochemical method. The relationship between H2Bub expression level and the clinicopathological characteristics was analyzed, Kaplan-Meier method was used to analyze the relationship H2Bub expression level and the survival.Results:H2Bub was positively expressed in esophageal carcinoma and para-carcinoma tissues, and weakly positive expressed H2Bub was found in para-carcinoma tissues, while not found in esophageal carcinoma tissues. The strongly positive expression rate of H2Bub in esophageal carcinoma tissues was higher than that in para-carcinoma tissues [84.0% (63/75) vs. 22.7% (17/75), χ2 = 34.68, P < 0.001]. Compared with para-carcinoma tissues, 64.0% (48/75) of H2Bub expression level in carcinoma tissues was up-regulated, and 2.7% (2/75) of H2Bub expression level was down-regulated. The up-regulated expression of H2Bub in esophageal carcinoma tissues compared with para-carcinoma tissues was not related with the gender, age, tumor diameter, lymph node metastasis and T staging (all P > 0.05). The proportion of patients with up-regulated expression of H2Bub in poorly differentiated carcinoma tissues was lower than that in moderately and highly differentiated carcinoma tissues [43.8% (7/16) vs. 66.7% (34/51), 87.5% (7/8), P = 0.037]. The median overall survival time was 70 months (95% CI 45-95 months) and 68 months (95% CI 54-82 months), respectively in 12 esophageal carcinoma patients with moderately positive expressed H2Bub and 63 esophageal carcinoma patients with strongly positive expressed H2Bub, and the difference was statistically significant ( P = 0.606). Among 48 patients with up-regulated expression of H2Bub in esophageal carcinoma tissues compared with para-carcinoma tissues, the median overall survival time of poorly differentiated esophageal carcinoma group (7 cases) was shorter than that of highly differentiated (7 cases) and moderately differentiated (34 cases) esophageal carcinoma group [36 months (95% CI 24-37 months) vs. 68 months (95% CI 38-98 months), 68 months (95% CI 44-91 months)], and the differences were statistically significant (all P < 0.05). Conclusions:The expression level of H2Bub in esophageal carcinoma tissues is up-regulated compared with that in para-carcinoma tissues. The up-regulated H2Bub expression level of patients with poorly differentiated esophageal carcinoma with poor prognosis is obvious.
RESUMO
Objective:To explore the effect of autophagy inhibitor 3-methyladenine(3-MA) on camptothecin(CPT)-induced Hela cell apoptosis.Methods:MTT assays were carried out to determine the optimal concentration and time of CPT on Hela cells and the effect of different drugs on Hela cell proliferation activity .After Hela cells were treated with different drugs ,the changes of autophagy marker protein( microtubule-associated protein 1 light chain 3,LC3),p62 and apoptosis-related protein were detected using Western blot and immunofluorescence ( IF) .DAPI ( nuclear ) staining was used to observe cell apoptosis rate .Results: In CPC-treated Hela cells,Hela cell proliferation activity declined dramatically ,and autophagy could be induced to occur .Compared with CPT group ,the cell proliferation activity was lower in CPT combined with 3-MA group,the level of autophagy decreased ,but the apoptosis rate significantly increased.Conclusion:CPT can induce autophagy while inducing Hela cell death .Hela cells chemosensitivity to CPT treatment can be enhanced by 3-MA inhibiting autophagy .
RESUMO
Phosphorylation is the most common way of p 53 post-translational modifications .However , gaps still exist in our knowledge regarding the role and mechanism of phosphorylation of p 53 at Ser392 in carcinogenesis and cancer prevention.In the present study, we summarized the effect of phos-p53-Ser392 to wild-type and mutant p53, the regulation by DNA damage agents and protein kinase , and the significance of phosphorylation of p 53-Ser392 in cancer treatment .
RESUMO
To investigate the distribution of hepatitis B virus (HBV) genotypes and subgenotypes among the Bai nationality in Dali, a total of 100 serum samples from patients with chronic HBV-infection were collected for the detection of HBV genotypes and subgenotypes by genotype-specific primers and restriction fragment length polymorphism (RLFP), respectively. Among the 100 samples, the proportions of genotype B, C and mixed genotype (B+C) were 41%, 25% and 34%, respectively. All the genotype B strains belonged to subgenotype Ba. In genotype C, 84% were Subgenotype Cs and 12% were subgenotype Ce. The distribution of genotypes B, C and B+C showed no significant difference between male and female patients (P=0.182) and among the age groups of patients (P=0.812). The rates of HBeAg/HBeAg positivity were no significantly different among genotypes B, genotype C and mixed genotype (B+C) (P=0.077/P=0.663). In Dali, genotypes B, B+C and C existed among Bai nationality with chronic HBV-infection, and genotype B was the major genotype. Subgenotypes Ba and Cs were the predominant strains in patients with HBV genotype B/C infection. The most prominent characteristic was the higher prevalent rate of mixed genotype (B+C) in patients.