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Intratibial Osteosarcoma Cell Injection to Generate Orthotopic Osteosarcoma and Lung Metastasis Mouse Models
Published on: October 28, 2021
MiR-100 Inhibits Osteosarcoma Cell Proliferation, Migration, and Invasion and Enhances Chemosensitivity by Targeting
Yang Liu1, Shu-Tao Zhu2, Xiao Wang2
1Department of Orthopedics, Huaihe Hospital of Henan University, Kaifeng, China hhyyly163@163.com.
Abstract:
MicroRNAs are highly conserved noncoding RNA that negatively modulate protein expression at a posttranscriptional and/or translational level. MicroRNAs play an important role in the development and progression of human cancers, including osteosarcoma. Recent studies have shown that miR-100 was downregulated in many cancers; however, the role of miR-100 in human osteosarcoma has not been totally elucidated. In this study, we demonstrate that the expression of miR-100 was significantly downregulated in human osteosarcoma tissues compared to the adjacent tissues. Enforced expression of miR-100 inhibited cell proliferation, migration, and invasion abilities of osteosarcoma cells, U-2OS, and MG-63. Additionally, miR-100 also sensitized osteosarcoma cells to cisplatin and promoted apoptosis. Furthermore, overexpression of miR-100 decreased the expression of insulin-like growth factor I receptor and inhibited PI3K/AKT and MAPK/ERK signaling. In human clinical specimens, insulin-like growth factor I receptor was inversely correlated with miR-100 in osteosarcoma tissues. Collectively, our results demonstrate that miR-100 is a tumor suppressor microRNA and indicate its potential application for the treatment of osteosarcoma in future.
Insights
MicroRNA 100 (miR-100) is downregulated in osteosarcoma, acting as a tumor suppressor. Restoring miR-100 inhibits cancer cell growth and enhances cisplatin sensitivity, offering potential therapeutic strategies.
Area of Science:
- Oncology
- Molecular Biology
- Genetics
Background:
- MicroRNAs (noncoding RNA) regulate gene expression post-transcriptionally.
- MicroRNAs are implicated in human cancer development, including osteosarcoma.
- The specific role of miR-100 in osteosarcoma remains incompletely understood.
Purpose of the Study:
- To investigate the expression and function of miR-100 in human osteosarcoma.
- To determine the therapeutic potential of miR-100 in osteosarcoma treatment.
Main Methods:
- Quantitative analysis of miR-100 expression in osteosarcoma tissues versus adjacent tissues.
- In vitro studies involving enforced miR-100 expression in osteosarcoma cell lines (U-2OS, MG-63).
- Assessment of cell proliferation, migration, invasion, apoptosis, and signaling pathways (PI3K/AKT, MAPK/ERK).
Main Results:
- miR-100 expression was significantly downregulated in osteosarcoma tissues.
- Enforced miR-100 expression suppressed osteosarcoma cell proliferation, migration, and invasion.
- miR-100 overexpression promoted apoptosis and sensitized cells to cisplatin.
- miR-100 inhibited insulin-like growth factor I receptor (IGF-1R) expression and downstream signaling pathways.
- IGF-1R expression was inversely correlated with miR-100 levels in clinical specimens.
Conclusions:
- miR-100 functions as a tumor suppressor in human osteosarcoma.
- miR-100 targets IGF-1R, inhibiting PI3K/AKT and MAPK/ERK signaling.
- miR-100 demonstrates potential as a therapeutic agent for osteosarcoma.
