CircNR3C1 Alleviates Gastric Cancer Development by Inactivating AKT/mTOR

Area of Science:

• Oncology
• Molecular Biology
• Biochemistry

Background:

• Gastric cancer (GC) remains a significant global health challenge.
• Understanding the molecular mechanisms underlying GC progression is crucial for developing effective therapies.
• Circular RNAs (circRNAs) are emerging as key regulators in various cancers, including GC.

Purpose of the Study:

• To investigate the differential expression and regulatory role of circNR3C1 in gastric cancer.
• To elucidate the association between circNR3C1 levels and clinicopathological features of GC.
• To explore the underlying molecular mechanisms involving the AKT/mTOR signaling pathway.

Main Methods:

• Quantitative real-time PCR (qRT-PCR) to determine circNR3C1 expression in GC tissues and cell lines.
• Analysis of circNR3C1 expression correlation with pathological indicators.
• In vitro experiments involving circNR3C1 knockdown and overexpression in GC cells (BGC-823 and AGS).
• Western blot analysis to assess AKT and mTOR protein levels.
• Pharmacological manipulation of the AKT/mTOR pathway.

Main Results:

• circNR3C1 was significantly downregulated in GC tissues and cells compared to normal controls.
• Low circNR3C1 expression was associated with increased risk of lymphatic and distant metastasis.
• circNR3C1 knockdown promoted GC cell proliferation and migration, while overexpression inhibited these processes.
• circNR3C1 was found to downregulate AKT and mTOR protein levels in GC cells.
• Modulation of AKT/mTOR signaling could reverse the effects of circNR3C1 on GC cell phenotypes.

Conclusions:

• circNR3C1 functions as a tumor suppressor in gastric cancer.
• circNR3C1 inhibits GC cell proliferation and migration by negatively regulating the AKT/mTOR signaling pathway.
• circNR3C1 expression levels are closely linked to GC metastasis and may serve as a potential prognostic biomarker.