Abstract
Background Accumulating evidence has implicated long noncoding RNAs (lncRNAs) in glioma progression. Here, we aimed to explore the potential roles of a novel lncRNA, LINC00355, in glioma and to clarify the underlying mechanisms. Methods RT-PCR was used to examine the relative expressions of LINC00355 in glioma cell lines and specimen samples. The clinicopathological and prognostic significances of LINC00355 in glioma patients were statistically analyzed. To determine cell activities, CCK-8, clonogenic assays, flow cytometry, migration, and invasion assays were performed. Moreover, the potential mechanisms of LINC00355 were investigated by bioinformatics assays and luciferase reporter assays. Results LINC00355 expression was increased in glioma cell lines and specimens, and higher LINC00355 expression predicted advanced clinical progress and reduced overall survival and disease-free survival in glioma patients. Functionally, LINC00355 depletion promoted cell proliferation, invasion, and migration in glioma cells and induced apoptosis of glioma cells, whereas LINC00355 upregulation resulted in the opposite effects in vitro. Mechanistic assays revealed that LINC00355 as a sponge for miR-1225 repressed fibronectin type III domain-containing 3B (FNDC3B) expressions. Conclusion Our findings revealed the tumor-promotive roles of LINC00355 in the progression of glioma, indicating that LINC00355 exhibited ceRNA functions via modulating miR-1225/FNDC3B axis.
Highlights
Glioma represents the most prevalent and fatal brain neoplasm in both men and women, accounting for >75% of primary intracranial brain tumors [1]
For the first time, we identified a novel glioma-associated long noncoding RNAs (lncRNAs), lncRNA LINC00355 (LINC00355), which was demonstrated to be overexpressed in glioma specimens and predict a poor clinical prognosis of glioma patients
We firstly performed RT-PCR to detect the levels of LINC00355 in 121 glioma patients from our hospital
Summary
Glioma represents the most prevalent and fatal brain neoplasm in both men and women, accounting for >75% of primary intracranial brain tumors [1]. Because of the sluggish development in exploring the potential pathogenesis, the effective therapeutic strategies for this tumor are limited [4]. Accumulating evidence has implicated long noncoding RNAs (lncRNAs) in glioma progression. We aimed to explore the potential roles of a novel lncRNA, LINC00355, in glioma and to clarify the underlying mechanisms. RT-PCR was used to examine the relative expressions of LINC00355 in glioma cell lines and specimen samples. LINC00355 depletion promoted cell proliferation, invasion, and migration in glioma cells and induced apoptosis of glioma cells, whereas LINC00355 upregulation resulted in the opposite effects in vitro. Our findings revealed the tumor-promotive roles of LINC00355 in the progression of glioma, indicating that LINC00355 exhibited ceRNA functions via modulating miR1225/FNDC3B axis
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