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Genome-wide Screen for miRNA Targets Using the MISSION Target ID Library
Published on: April 6, 2012
MicroRNA-154 functions as a tumor suppressor in osteosarcoma by targeting Wnt5a
Hui Zhou1, Minglei Zhang1, Hongping Yuan2
1China‑Japan Union Hospital of Jilin University, Nanguan, Changchun 13033, P.R. China.
Abstract:
MicroRNAs (miRNAs) are small non-coding RNAs that are involved in tumor initiation and development by suppressing target gene expression. miRNA-154 has been shown to be important in tumorigenesis in many types of cancers. However, its role in osteosarcoma (OS) remains unknown. In the present study, we focused on the roles and mechanisms of miR‑154 in OS development. The results of quantitative RT‑PCR showed that miR‑154 expression was decreased in primary OS tumor samples and cell lines compared to levels in the matched adjacent normal tissues and human normal osteoblast cells (NHOst). Restoration of expression in U2OS cells inhibited cell proliferation, colony formation, migration and invasion, as well as induced cell cycle arrest at the G1 stage. Bioinformatic prediction suggested that Wnt5a is a target gene of miR‑154. It was further verified that Wnt5a is a target gene of miR‑150 in OS cells using luciferase assay, mRNA and protein expression analysis. Wnt5a was upregulated in OS cell lines and primary tumor samples, and its mRNA expression level was negatively correlated with the miR‑154 level in the OS tissues. Restored expression of Wnt5a weakened miR‑154‑mediated suppression of tumor progression. Taken together, these findings suggest that miR‑154 functions as a tumor suppressor in OS by partially suppressing Wnt5a expression.
Insights
MicroRNA-154 (miR-154) acts as a tumor suppressor in osteosarcoma (OS) by inhibiting cell growth and metastasis. It functions by downregulating Wnt5a expression, a key factor in OS progression.
Area of Science:
- Molecular Biology
- Oncology
- Genetics
Background:
- MicroRNAs (miRNAs) regulate gene expression and are implicated in cancer development.
- miRNA-154 (miR-154) has known roles in various cancers, but its function in osteosarcoma (OS) is uncharacterized.
Purpose of the Study:
- To investigate the role and underlying mechanisms of miR-154 in osteosarcoma development.
- To determine if miR-154 acts as a tumor suppressor or oncogene in OS.
Main Methods:
- Quantitative RT-PCR to assess miR-154 expression in OS tissues and cell lines.
- Cell proliferation, colony formation, migration, and invasion assays upon miR-154 restoration.
- Bioinformatic analysis, luciferase assays, and Western blotting to identify and validate miR-154 targets.
- Correlation analysis between miR-154 and Wnt5a expression in OS tissues.
Main Results:
- miR-154 expression was significantly downregulated in OS tissues and cell lines.
- Restoring miR-154 inhibited OS cell proliferation, colony formation, migration, invasion, and induced G1 cell cycle arrest.
- Wnt5a was identified as a direct target of miR-154 and was upregulated in OS.
- Wnt5a expression was inversely correlated with miR-154 levels in OS tissues, and its restoration partially reversed miR-154's tumor-suppressive effects.
Conclusions:
- miR-154 functions as a tumor suppressor in osteosarcoma.
- The tumor-suppressive role of miR-154 in OS is mediated, in part, by the downregulation of Wnt5a expression.
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