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Background and purpose: The role of neddylation modification in breast cancer has rarely been reported. Previous study found that neddylation modification blocking induced cellular senescence in breast cancer, however, the potential mechanism has not yet been fully elucidated. It is reported that lamin B1 deletion leads to cellular senescence. The purpose of this study was to investigate the correlation between neddylation modification and lamin B1 expression in breast cancer and its possible mechanism. Methods: Neural precursor cell expressed developmentally downregulated protein 8 (NEDD8) and NEDD8-activating enzyme 1 (NAE1), two key proteins of neddylation modification process, in addition to lamin B1 were immunohistochemically stained in tissue microarray from 113 breast cancer patients. The correlation of NEDD8 and NAE1 with lamin B1 was analyzed using Spearman’s rank analysis. The expression of NEDD8 was knocked down to block neddylation modification by CRISPR/Cas9 technique. Western blot assay was used to detect the regulation of lamin B1 by neddylation modification and its mechanisms. Results: Lamin B1 expression was positively correlated with NEDD8 (r=0.817, P

Objective: To evaluate the protective effects of oral administration of D-methionine tablets on noise-induced hearing impairment., Method: Two hundred and three volunteers were recruited and randomly divided into two groups: experimental group (n= 113) and control group (n=90). The subjects received oral administration of D-methionine tablets in the experimental group and placebo in the control group before noise exposure. Routine audiometric evaluation and ABR testing were performed and recorded before and after noise exposure. The statistical analysis was carried out with SPSS 11.0., Result: There were no differences in auditory threshold and I-V interpeak latency pre-noise exposure (P>0.05), however, there were statistically significant differences between two groups 1 d, 7 d after noise exposure (P<0.01 and P<0.05). In-respective-group, there were statistically significant differences between before and 1 d after noise exposure (P<0.05 and P<0.01), however, no difference was noted between before and 7 d after noise exposure in the experimental group (P>0.05)., Conclusion: The protective effects of D-methionine tablets were prominent on the noise-induced hearing impairment. Further studies regarding the optimal time of D-methionine administration will be recommended in the future.

Objective: To evaluate the protective effects of oral administration of N-acetyl-cysteine (NAC) on noise-induced hearing loss., Method: Three hundred sixty three volunteers were recruited and randomly divided into two groups: experimental group (n=223) and control group (n=140). The subjects had received oral administration of NAC in the experimental group and placebo in the control group before noise exposure. The routine audiometric evaluation and ABR testing were performed and recorded pre- and post-noise exposure. The statistical analysis was carried out on the data obtained from two groups with SPSS 11.0., Result: The hearings of all the participatory were changed after noise exposure, but there were statistically significant differences between two groups., Conclusion: The protective effects of NAC were prominent on the noise-induced hearing loss.