CircMTA2 Drives Gastric Cancer Progression through Suppressing MTA2 Degradation via Interacting with UCHL3

Area of Science:

• Oncology
• Molecular Biology
• Genetics

Background:

• Metastasis-associated protein 2 (MTA2) is implicated in gastric cancer (GC) tumorigenesis and aggressiveness.
• The precise molecular mechanisms and upstream regulation of MTA2 in GC remain unclear.

Purpose of the Study:

• To identify and characterize novel regulators of MTA2 in gastric cancer.
• To elucidate the role of circMTA2 in GC progression and its underlying molecular mechanisms.

Main Methods:

• Identification and expression analysis of circMTA2 in GC tissues and cell lines.
• In vitro and in vivo functional assays to assess the impact of circMTA2 on GC cell behavior.
• Mechanistic studies involving protein-protein interactions (circMTA2-UCHL3) and ubiquitination assays.
• Exosome isolation and analysis to investigate circMTA2 transport.

Main Results:

• A novel circular RNA derived from the MTA2 gene (circMTA2) was identified and found to be highly expressed in GC.
• CircMTA2 significantly promoted GC cell proliferation, invasion, and metastasis in vitro and in vivo.
• CircMTA2 stabilized MTA2 protein by inhibiting its ubiquitination through interaction with UCHL3.
• CircMTA2 was packaged into exosomes and secreted, contributing to GC progression.

Conclusions:

• CircMTA2 acts as a crucial oncogenic factor in gastric cancer by stabilizing MTA2 protein via the circMTA2/UCHL3 interaction.
• The circMTA2/UCHL3/MTA2 axis represents a novel cancer-promoting pathway in GC.
• This axis presents potential therapeutic targets for developing novel inhibitors and combination therapies for gastric cancer.