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miRNA-221 acts as an oncogenic role by directly targeting TIMP2 in non-small-cell lung carcinoma
Zijun Yin1, Meng Xu1, Ping Li1
1Department of oncology, The First Affiliated Hospital of Jinan University, Guangzhou 510632, China.
Abstract:
MicroRNA-221 (miRNA-221) plays an important role in occurrence and development of tumor. However, expression pattern and role of miRNA-221 in the non-small-cell lung carcinoma (NSCLC) remains poorly understood. In the current study, we explored the roles and the underlying mechanism of miR-221 in NSCLC by gain and loss of function analysis. We found that the expression of miRNA-221 is significantly higher in NSCLC tissues and NSCLC cells compared to normal tissues and cells, respectively (P<0.05). NSCLC cell lines SPCA1 and H1299 were transfected with miRNA-221 mimic or inhibitor, respectively, and then performed to analysis. Experiments indicated that upregulation of miRNA-221 promotes cell proliferation, cell cycle, migration, invasion in SPCA1 cells, while downregulation of miRNA-221 exhibited the opposite role. Tissue inhibitor of metallopeptidases-2 (TIMP2) mRNA or protein levels were downregulated after miRNA-221 overexpression in SPCA1 and H1299 cells, respectively. Furthermore, TIMP2 was identified as a direct target of miRNA-221. In summary, our results indicate that miRNA-221 promotes NSCLC growth and invasion through repressing the expression of TIMP2, which suggest that inhibition of miRNA-221 could be a potential target for the treatment of NSCLC.
Insights
MicroRNA-221 (miRNA-221) promotes non-small-cell lung carcinoma (NSCLC) growth and invasion by downregulating TIMP2. Inhibiting miRNA-221 may offer a potential therapeutic strategy for NSCLC.
Area of Science:
- Oncology
- Molecular Biology
- Genetics
Background:
- MicroRNA-221 (miRNA-221) is implicated in tumor development, but its specific role in non-small-cell lung carcinoma (NSCLC) is not well understood.
- Understanding miRNA-221's function in NSCLC is crucial for developing targeted therapies.
Purpose of the Study:
- To investigate the expression pattern and functional role of miRNA-221 in NSCLC.
- To elucidate the underlying molecular mechanism of miRNA-221 in NSCLC progression.
Main Methods:
- Comparative analysis of miRNA-221 expression in NSCLC tissues and cells versus normal controls.
- Gain and loss of function experiments using miRNA-221 mimics and inhibitors in NSCLC cell lines (SPCA1, H1299).
- Assessment of cell proliferation, cell cycle, migration, invasion, and TIMP2 expression levels.
Main Results:
- miRNA-221 expression was significantly upregulated in NSCLC tissues and cells.
- Overexpression of miRNA-221 enhanced NSCLC cell proliferation, cell cycle progression, migration, and invasion.
- Downregulation of miRNA-221 inhibited these processes.
- Tissue inhibitor of metallopeptidases-2 (TIMP2) was identified as a direct target of miRNA-221, with its expression inversely correlated to miRNA-221 levels.
Conclusions:
- miRNA-221 promotes NSCLC growth and invasion by suppressing TIMP2 expression.
- Targeting miRNA-221 could represent a novel therapeutic approach for NSCLC treatment.