MicroRNA-561 inhibits gastric cancercell proliferation and invasion by downregulating c-Myc expression

Area of Science:

• Oncology
• Molecular Biology
• Genetics

Background:

• Gastric cancer (GC) is a leading cause of cancer mortality worldwide, with its molecular pathogenesis incompletely understood.
• MicroRNAs (miRNAs) are increasingly recognized for their roles in tumorigenesis, yet their specific involvement in GC requires further elucidation.

Purpose of the Study:

• To investigate the role of miR-561 in the development and progression of gastric cancer.
• To identify the molecular targets and mechanisms through which miR-561 exerts its effects in GC.

Main Methods:

• Analysis of miR-561 expression in human GC cell lines and tissues.
• In vitro experiments assessing the effects of miR-561 modulation on GC cell proliferation and invasion.
• Identification and validation of c-Myc as a direct target of miR-561 using luciferase reporter assays and Western blotting.

Main Results:

• miR-561 expression was significantly down-regulated in GC tissues and cell lines, correlating with advanced tumor-node-metastasis (pTNM) stage.
• Overexpression of miR-561 inhibited GC cell proliferation and invasion, while its knockdown promoted these processes.
• miR-561 directly targets and suppresses c-Myc expression; restoration of c-Myc reversed the anti-proliferative and anti-invasive effects of miR-561.

Conclusions:

• miR-561 functions as a novel tumor suppressor in gastric cancer.
• The miR-561/c-Myc axis plays a critical role in regulating GC cell proliferation and invasion, offering potential therapeutic targets.