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MicroRNA-124 suppresses Slug-mediated lung cancer metastasis
Objective:
Non-small cell lung cancer (NSCLC) is the most common type of lung cancer but its carcinogenesis remains not completely elucidated. Dysregulation of microRNAs (miRNAs) is involved in the development of various cancers, including NSCLC, whereas a role of miR-124 in the pathogenesis of NSCLC has not been reported. Here we addressed these questions.
Patients And Methods:
We examined the levels of Slug and miR-124 in NSCLC tissue, compared to the adjacent non-tumor tissue. We also examined the relationship between miR-124 and Slug. The levels of miR-124 were then modified in NSCLC cells, and then the effects on cell invasion were evaluated.
Results:
We detected significantly higher levels of Slug and significantly lower levels of miR-124 in NSCLC tissue, compared to the adjacent non-tumor tissue, and the values of miR-124 and Slug were inversely correlated. Moreover, the low miR-124 levels in NSCLC specimens were associated with poor survival of the patients. In vitro, overexpression of miR-124 significantly inhibited cell invasion, while depletion of miR-124 increased cell invasion in NSCLC cells. The effects of miR-124 on cell growth appeared to result from its regulation of Slug.
Conclusions:
Our study highlights miR-124 as a previously unrecognized factor that controls NSCLC invasiveness, and the findings here may be important for developing an innovative therapeutic treatment for NSCLC.
Insights
MicroRNA-124 (miR-124) is downregulated in non-small cell lung cancer (NSCLC) and inversely correlated with Slug. Lower miR-124 levels predict poor patient survival and inhibit NSCLC cell invasion, suggesting a therapeutic role.
Area of Science:
- Oncology
- Molecular Biology
- Genetics
Background:
- Non-small cell lung cancer (NSCLC) is the most prevalent form of lung cancer, yet its underlying carcinogenesis is not fully understood.
- MicroRNA (miRNA) dysregulation is implicated in various cancers, but the specific role of miR-124 in NSCLC pathogenesis remains uninvestigated.
Purpose of the Study:
- To investigate the role of miR-124 and its relationship with Slug in NSCLC.
- To determine the impact of miR-124 modulation on NSCLC cell invasion.
Main Methods:
- Quantitative analysis of Slug and miR-124 levels in NSCLC tissues versus adjacent non-tumor tissues.
- Correlation analysis between miR-124 and Slug expression.
- In vitro experiments involving miR-124 level manipulation in NSCLC cells to assess effects on cell invasion.
Main Results:
- NSCLC tissues exhibited significantly higher Slug and lower miR-124 levels compared to non-tumor tissues.
- miR-124 and Slug levels were inversely correlated in NSCLC specimens.
- Low miR-124 expression was associated with poorer patient survival.
- Overexpression of miR-124 suppressed NSCLC cell invasion, while its depletion enhanced invasion, mediated by Slug regulation.
Conclusions:
- miR-124 acts as a novel tumor suppressor in NSCLC by inhibiting cell invasion.
- The findings suggest miR-124's potential as a therapeutic target for NSCLC treatment.
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