MiR-504-3p Has Tumor-Suppressing Activity and Decreases IFITM1 Expression in Non-Small Cell Lung Cancer Cells

Area of Science:

• Oncology
• Molecular Biology
• Genetics

Background:

• Non-small cell lung cancer (NSCLC) is a leading cause of cancer-related mortality.
• MicroRNAs (miRNAs) play crucial roles in cancer development and progression.
• The specific role of miR-504-3p in NSCLC remains largely uncharacterized.

Purpose of the Study:

• To investigate the functional impact of miR-504-3p expression on NSCLC cell proliferation, migration, cell cycle, and apoptosis.
• To elucidate the underlying molecular mechanisms, including the potential target gene IFITM1.
• To analyze miR-504 expression patterns in NSCLC patient tissues.

Main Methods:

• Utilized The Cancer Genome Atlas (TCGA) database for comparative analysis of miR-504 expression in NSCLC versus normal tissues.
• Employed lentiviral vectors for overexpression and knockdown of miR-504-3p in NSCLC cell lines.
• Quantified gene expression using Quantitative Real-Time Polymerase Chain Reaction (qRT-PCR) for miR-504-3p and IFITM1.
• Validated direct targeting of IFITM1 by miR-504-3p using a luciferase reporter assay.

Main Results:

• miR-504-3p expression was significantly downregulated in NSCLC tissues compared to normal lung tissues.
• Overexpression of miR-504-3p inhibited NSCLC cell proliferation and migration and induced apoptosis.
• miR-504-3p overexpression did not significantly affect NSCLC cell cycle progression.
• miR-504-3p significantly decreased IFITM1 expression and luciferase activity in NSCLC cells, indicating direct targeting.

Conclusions:

• miR-504-3p acts as a tumor suppressor in NSCLC by inhibiting cell proliferation and migration and promoting apoptosis.
• The downregulation of IFITM1 by miR-504-3p is a key mechanism underlying its tumor-suppressive functions in NSCLC.
• miR-504-3p represents a potential therapeutic target for NSCLC treatment.