Gliomas are the most common primary
central nervous system tumors and account for approximately 80% of malignant
brain tumors.
MicroRNAs (
miRNAs) are a class of small non-coding, regulatory
RNA molecules that mediate the expression levels of specific
proteins. As a member of the
miRNA family, miR-543 plays a
tumor suppressive or an oncogenic role in different types of
tumors. However, the expression and role of miR-543 in
glioma remain unknown. In the present study, the expression level of miR-543 in
glioma cell lines and tissues was investigated. A series of in vitro and in vivo experiments was then performed to elucidate the function of miR-543 in
glioma. Moreover, proteomic profiling was applied in this study to determine the landscape of differentially expressed
proteins associated with miR-543-mediated
carcinogenesis in
glioma. We found that the expression level of miR-543 was greatly downregulated in
glioma cell lines and tissues. Furthermore, the expression level of miR-543 was negatively associated with high-grade
glioma. Functional studies demonstrated that miR-543 in
glioma cells induced apoptosis and inhibited growth, the cell cycle, migration and invasion. In addition, the in vivo study showed that miR-543 suppressed tumorigenicity of
glioma cells. In the present study, a label-free quantitative proteomic approach was performed and 339
proteins were identified as dysregulated after miR-543 was overexpressed. Among these dysregulated
proteins, 165 were upregulated and 174 were downregulated. Moreover, multiple pathways were significantly enriched and were probably involved in miR-543-mediated
tumorigenesis, including RNA degradation and the
inositol phosphate metabolism pathway. In conclusion, miR-543 may function as a
tumor suppressor in
glioma and may serve as a future therapeutic target in
therapy for patients with
glioma.