Upregulation of lncRNA PlncRNA-1 indicates the poor prognosis and promotes glioma progression by activation of Notch signal pathway

Prostate cancer-up-regulated long noncoding RNA 1(PlncRNA-1) has been demonstrated to be increased in several cancers, which plays an oncogenic role in the development of cancer. However, the exact functions and molecular mechanism of PlncRNA-1 in the tumorigenesis of glioma has not been studied. In present work, we firstly identified that PlncRNA-1 expression levels were prominently augmented in glioma patient tissues and glioma cell lines compared with adjacent noncancerous tissue and normal cells, respectively. Moreover, Kaplan-Meier survival analysis indicated that glioma patients with high PlncRNA-1 expression had shorter overall survival (OS) and progression-free survival (PFS) than those with low PlncRNA-1 expression. Furthermore, loss-of-function assay showed that PlncRNA-1 knockdown dramatically reduced cell proliferation, colony formation, and promoted apoptosis of glioma cell lines. In addition, overexpression of PlncRNA-1 promoted cell proliferation, stimulated cell colony formation, and inhibited cell apoptosis in NHA cells. Mechanically, our results showed that PlncRNA-1 significantly promoted activation of the Notch signal pathway through regulation of Notch-1, Jag-1, and Hes-1 expression. Collectively, our results implied that lncRNA PlncRNA-1 may exert tumorpromoting role in the development and progression of glioma through modulation of Notch signal pathway, providing a candidate therapeutic target for patients with glioma.