ELP3 stabilizes c-Myc to promote tumorigenesis

Area of Science:

• Molecular Biology
• Cancer Biology
• Biochemistry

Background:

• ELP3, a subunit of the Elongator complex, functions as an acetyltransferase and is linked to tumor progression.
• The precise oncogenic mechanisms of ELP3 remain incompletely understood.

Purpose of the Study:

• To elucidate the specific oncogenic function of ELP3 in tumorigenesis.
• To investigate the molecular mechanisms by which ELP3 contributes to cancer development.

Main Methods:

• Investigated ELP3's interaction with c-Myc and FBXW7β.
• Assessed the impact of ELP3 knockdown on cellular metabolism and proliferation.
• Utilized xenograft models to evaluate tumor growth.
• Correlated ELP3 and c-Myc expression in human cancer tissues.

Main Results:

• ELP3 stabilizes c-Myc independently of its acetyltransferase activity.
• ELP3 competes with FBXW7β for c-Myc binding, inhibiting c-Myc ubiquitination and degradation.
• ELP3 knockdown reduces glycolysis and glutaminolysis, inhibiting cell proliferation and xenograft growth via c-Myc downregulation.
• Overexpression of ELP3 and c-Myc with positive correlation observed in colorectal and hepatocellular carcinomas.

Conclusions:

• ELP3 promotes tumorigenesis by stabilizing c-Myc through a mechanism independent of its acetyltransferase function.
• ELP3 inhibition represents a potential therapeutic strategy for c-Myc-driven carcinomas.