The Potential Prognostic Value of MicroRNA-429 for Human Gliomas.

MicroRNA-429 (miR-429) is reported to be frequently dysregulated in cancer. Studies have demonstrated that miR-429 functions as either an oncogene or a tumor suppressor depending on the tumor type. To date, its role in human glioma has not yet been reported. The aim of this study was to investigate the expression levels, clinicopathological significance, and prognostic significance of miR-429 in glioma tissues. Quantitative real-time PCR assay was performed to detect miR-429 expression in human glioma and non-neoplastic brain tissues. The association of miR-429 expression with clinicopathological features and prognoses of glioma patients were analyzed by SPSS 17.0 statistical software. The expression levels of miR-429 were found to be distinctly increased in glioma tissues compared to non-neoplastic brain tissues (P<0.01) with ascending pathological grade. The 5-year survival rate of patients with high miR-429 expression was significantly lower than those with low miR-429 expression (P<0.001). Moreover, multivariate Cox regression analyses showed that miR-429 high expression is an independent prognostic factor for glioma patients. Taken together, miR-429, was significantly up-regulated in glioma tissues. Therefore, miR-429 could be considered as an independent prognostic factor and potential therapeutic target for glioma.

Sun X ，Li Z ，Chen Y 《-》

Correlation of microRNA-375 downregulation with unfavorable clinical outcome of patients with glioma.

MicroRNA-375 (miR-375) is frequently demonstrated to be frequently dysregulated and functions as a tumor suppressor or an oncogene in different cancer types. However, its roles in human gliomas have not been reported. The aim of this study was to investigate the expression pattern and clinical significance of miR-375 in patients with gliomas. Real-time quantitative RT-PCR assay was performed to detect miR-375 expression in human gliomas and non-neoplastic brain tissues. Then, the association of miR-375 expression with clinicopathological factors and prognosis of glioma patients was also statistically analyzed. miR-375 expression was significantly decreased on average in glioma tissues relative to non-neoplastic brain tissues (P<0.0001) with ascending pathological grade. Then, the low miR-375 expression in glioma tissues was significantly associated with advanced pathological grade (P=0.003) and low Karnofsky performance score (KPS, P=0.01). Moreover, both univariate and multivariate Cox regression analyses determined that loss of miR-375 expression effectively predicted the decreased overall survival in patients with gliomas. These findings offer the first convinced evidence that the downregulation of miR-375 expression in human gliomas may play an inhibitory role during the tumor development. This miRNA might function as a candidate unfavorable prognostic marker for human gliomas.

Chang C ，Shi H ，Wang C ，Wang J ，Geng N ，Jiang X ，Wang X ... -  《-》

Up-regulation of microRNA-15b correlates with unfavorable prognosis and malignant progression of human glioma.

Pang C ，Guan Y ，Zhao K ，Chen L ，Bao Y ，Cui R ，Li G ，Wang Y ... -  《International Journal of Clinical and Experimental Pathology》

Downregulation of microRNA-504 is associated with poor prognosis in high-grade glioma.

Guan Y ，Chen L ，Bao Y ，Pang C ，Cui R ，Li G ，Liu J ，Wang Y ... -  《International Journal of Clinical and Experimental Pathology》

Reduced expression of microRNA-497 is associated with greater angiogenesis and poor prognosis in human gliomas.

MicroRNA (miR)-497 plays a tumor-suppressive role in several malignancies and is involved in glioma invasiveness and resistance to chemotherapy. To add to the knowledge of the clinical significance of miR-497 in human gliomas, quantitative real-time polymerase chain reaction was performed to detect the expression of miR-497 in 110 pairs of freshly prepared glioma and nonneoplastic brain tissues. Then the associations of miR-497 expression with various clinicopathological characteristics and overall survival of glioma patients were estimated statistically. Gain-of-function assays were also performed to examine the role of miR-497 in glioma angiogenesis. The expression of miR-497 in human glioma tissues was significantly lower than in nonneoplastic brain tissues (P<.001). In addition, low miR-497 expression was significantly associated with advanced World Health Organization grade (P<.001) and low Karnofsky performance scores (P=.02). Moreover, the survival of glioma patients with low miR-497 expression was dramatically shorter than that of patients with high miR-497 expression (P=.001). Forced expression of miR-497 in glioma cells inhibited tube formation by cocultured human brain microvascular endothelial cells. We also found that miR-497 overexpression in glioma cells led to decreased expression of vascular endothelial growth factor. In conclusion, miR-497 may be a favorable prognostic marker in human gliomas, in part by being a negative regulator of angiogenesis, implying its potential as a therapeutic target for this cancer.

Feng F ，Kuai D ，Wang H ，Li T ，Miao W ，Liu Y ，Fan Y ... -  《-》