机构:[1]Harbin Med Univ, Coll Bioinformat Sci & Technol, Harbin 150080, Peoples R China;[2]Capital Med Univ, Tiantan Hosp, Dept Neurosurg, Beijing 100050, Peoples R China;重点科室诊疗科室神经外科神经外科首都医科大学附属天坛医院[3]Harbin Med Univ, Coll Fundamental Med Sci, Harbin 150080, Peoples R China;[4]Tianjin Med Univ, Gen Hosp, Dept Neurosurg,Minist Educ, Lab Neurooncol,Tianjin Neurol Inst,Lab Neurotraum, Tianjin 300052, Peoples R China;[5]Tianjin Municipal Govt, Tianjin 300052, Peoples R China
Glioma is the most common and fatal primary brain tumour with poor prognosis; however, the functional roles of miRNAs in glioma malignant progression are insufficiently understood. Here, we used an integrated approach to identify miRNA functional targets during glioma malignant progression by combining the paired expression profiles of miRNAs and mRNAs across 160 Chinese glioma patients, and further constructed the functional miRNA-mRNA regulatory network. As a result, most tumour-suppressive miRNAs in glioma progression were newly discovered, whose functions were widely involved in gliomagenesis. Moreover, three miRNA signatures, with different combinations of hub miRNAs (regulations >= 30) were constructed, which could independently predict the survival of patients with all gliomas, high-grade glioma and glioblastoma. Our network-based method increased the ability to identify the prognostic biomarkers, when compared with the traditional method and random conditions. Hsa-miR-524-5p and hsa-miR-628-5p, shared by these three signatures, acted as protective factors and their expression decreased gradually during glioma progression. Functional analysis of these miRNA signatures highlighted their critical roles in cell cycle and cell proliferation in glioblastoma malignant progression, especially hsa-miR-524-5p and hsa-miR-628-5p exhibited dominant regulatory activities. Therefore, network-based biomarkers are expected to be more effective and provide deep insights into the molecular mechanism of glioma malignant progression.
基金:
National Natural Science Foundation of ChinaNational Natural Science Foundation of China [81121003, 91129710, 61170154, 61203264]; Specialized Research Fund for the Doctoral Program of Higher Education of ChinaSpecialized Research Fund for the Doctoral Program of Higher Education (SRFDP) [20102307110022]; China Postdoctoral Science FoundationChina Postdoctoral Science Foundation [2012M520764]; Heilongjiang Postdoctoral Fund [LBH-Z12214]; Innovation Research Fund for Graduate Students of Heilongjiang province [YJSCX2012-196HLJ]