CircRNA SMARCC1 Sponges MiR-140-3p to Regulate Cell Progression in Colorectal Cancer.

Area of Science:

• Oncology
• Molecular Biology
• Genetics

Background:

• Colorectal cancer (CRC) remains a significant global health challenge.
• Understanding the molecular mechanisms driving CRC progression is crucial for developing effective treatments.

Purpose of the Study:

• To investigate the role of circular RNA circSMARCC1 in the development and biological behavior of colorectal cancer (CRC).
• To elucidate the interaction between circSMARCC1 and microRNA miR-140-3p in CRC.

Main Methods:

• Quantitative real-time PCR (qRT-PCR) to assess circSMARCC1 and miR-140-3p expression in CRC tissues and cell lines.
• Cell proliferation, migration, and invasion assays (CCK8, colony formation, Transwell) to evaluate the functional impact of circSMARCC1 and miR-140-3p.
• Bioinformatics, ChIRP, and dual-luciferase reporter assays to confirm the binding relationship between circSMARCC1 and miR-140-3p.

Main Results:

• circSMARCC1 expression was significantly elevated in CRC tissues and cell lines, inversely correlated with miR-140-3p levels.
• Downregulation of circSMARCC1 reduced CRC cell viability, suppressed metastasis, and inhibited key proteins (MMP-2, MMP-9, VEGF).
• miR-140-3p mimics decreased cell viability and migration, while inhibitors reversed the effects of circSMARCC1 downregulation.

Conclusions:

• circSMARCC1 acts as a carcinogen in CRC by competitively binding to miR-140-3p.
• The circSMARCC1/miR-140-3p/MMPs axis is implicated in CRC progression.
• circSMARCC1 shows potential as a diagnostic biomarker and therapeutic target for colorectal cancer.