High protein acetylation/succinylation levels and their correlation with high histone 2AX expression level in breast cancer / 解剖学报

Objective To explore the protein acetylation/succinylation and histone 2AX (H2AX) expression levels in breast cancer, as well as their correlation. Methods By Western blotting and RT-PCR methods to detect the protein modification and H2AX expression levels in 11 breast cancer tissues and cells, as well as to explore the common regulation way of protein acetylation and succinylation by treatment of histone deacetylase inhibitors ; To study the relationship between H2AX expression level and protein modification level through the construction and over-expression of indicated plasmids. Results Compared with the adjacent normal tissues, there existed an increase protein acetylation/succinylation levels in breast cancer tissues, and the protein acetylation and succinylation were both regulated by histone deacetylase (HDAC) members. The H2AX mRNA and protein expression levels were increased both in breast cancer cell and tissues, its expression level and the expression and modification level of represented protein nucleophosmin 1(NPM1) showed a positive correlation. Conclusion The breast cancer possesses a characteristic of high protein acetylation/succinylation levels and high H2AX expression level, the H2AX expression level and the modification level of partial proteins in breast cancer have a positive correlation.

MiR-182-5p Knockdown Targeting PTEN Inhibits Cell Proliferation and Invasion of Breast Cancer Cells

PURPOSE: Breast cancer (BC) is one of the most common malignant tumors, affecting a significant number of women worldwide. MicroRNAs (miRNAs) have been reported to play important roles in tumorigenesis. The aim of this study was to determine the roles of miR-182-5p in BC progression. MATERIALS AND METHODS: The expressions of miR-182-5p and phosphatase and tensin homolog deleted on chromosome 10 (PTEN) were measured in BC tissues and cells by quantitative real-time polymerase chain reaction or Western blot. Cell proliferation and invasion were detected by cell counting kit-8 assay and trans-well assay, respectively. The interaction between miR-182-5p and PTEN was probed by bioinformatics analysis, luciferase activity, and RNA immunoprecipitation. A murine xenograft model was established to investigate the role of miR-182-5p in BC progression in vivo. RESULTS: An abundance of miR-182-5p was noted in BC tissues and cells. High expression of miR-182-5p was associated with poor survival. Abrogation of miR-182-5p inhibited cell proliferation and invasion in BC cells. Interestingly, PTEN was indicated as a target of miR-182-5p, and its restoration reversed miR-182-5p-mediated promotion of proliferation and invasion of BC cells. Moreover, depletion of miR-182-5p suppressed tumor growth via up-regulating PTEN expression in the murine xenograft model. CONCLUSION: MiR-182-5p exhaustion blocked cell proliferation and invasion by regulating PTEN expression, providing a novel therapeutic avenue for treatment of BC.