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Three-Dimensional Bone Extracellular Matrix Model for Osteosarcoma
Published on: April 12, 2019
The tumor suppressor role of miR-124 in osteosarcoma
Shuo Geng1, Xiaojun Zhang1, Jie Chen2
1Department of Orthopedic Surgery, the First Affiliated Hospital of Harbin Medical University, Nangang District, Harbin, Heilongjiang Prov., China.
Abstract:
MicroRNAs have crucial roles in development and progression of human cancers, including osteosarcoma. Recent studies have shown that miR-124 was down-regulated in many cancers; however, the role of miR-124 in osteosarcoma development is unknown. In this study, we demonstrate that expression of miR-124 is significantly downregulated in osteosarcoma tissues and cell lines, compared to the adjacent tissues. The expression of miR-124 in the metastases osteosarcoma tissues was lower than that in non- metastases tissues. We identified and confirmed Rac1 as a novel, direct target of miR-124 using prediction algorithms and luciferase reporter gene assays. Overexpression of miR-124 suppressed Rac1 protein expression and attenuated cell proliferation, migration, and invasion and induced apoptosis in MG-63 and U2OS in vitro. Moreover, overexpression of Rac1 in miR-124-transfected osteosarcoma cells effectively rescued the inhibition of cell invasion caused by miR-124. Therefore, our results demonstrate that miR-124 is a tumor suppressor miRNA and suggest that this miRNA could be a potential target for the treatment of osteosarcoma in future.
Insights
MicroRNA-124 (miR-124) is downregulated in osteosarcoma, suppressing tumor growth and invasion by targeting Rac1. This suggests miR-124 is a potential therapeutic target for osteosarcoma treatment.
Area of Science:
- Oncology
- Molecular Biology
- Genetics
Background:
- MicroRNAs regulate cancer development, with miR-124 implicated in various cancers.
- The specific role of miR-124 in osteosarcoma pathogenesis remains largely unexplored.
Purpose of the Study:
- To investigate the expression levels and functional role of miR-124 in osteosarcoma.
- To identify direct targets of miR-124 and elucidate its mechanism in osteosarcoma.
Main Methods:
- Quantitative real-time PCR to assess miR-124 expression in osteosarcoma tissues and cell lines.
- Bioinformatic prediction, luciferase reporter assays, and Western blotting to validate Rac1 as a direct target.
- In vitro functional assays (proliferation, migration, invasion, apoptosis) in osteosarcoma cell lines (MG-63, U2OS) with miR-124 overexpression and Rac1 rescue experiments.
Main Results:
- miR-124 expression was significantly downregulated in osteosarcoma tissues and cell lines, with lower levels in metastatic tissues.
- Rac1 was identified as a direct target of miR-124.
- Overexpression of miR-124 inhibited osteosarcoma cell proliferation, migration, and invasion, while promoting apoptosis.
- Restoration of Rac1 expression rescued the inhibitory effects of miR-124 on cell invasion.
Conclusions:
- miR-124 functions as a tumor suppressor miRNA in osteosarcoma.
- The miR-124/Rac1 axis plays a critical role in regulating osteosarcoma progression.
- miR-124 represents a promising therapeutic target for osteosarcoma treatment.
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