NEDD4L-Mediated Ubiquitination of GPX4 Exacerbates Doxorubicin-Induced Cardiotoxicity

Area of Science:

• Cardiology
• Molecular Biology
• Biochemistry

Background:

• Doxorubicin (DOX) is a vital chemotherapy drug, but its use is limited by doxorubicin-induced cardiotoxicity (DIC).
• Ferroptosis and apoptosis are key mechanisms driving DIC.
• The role of GPX4 ubiquitination in DIC is not well understood.

Purpose of the Study:

• To investigate the role of GPX4 ubiquitination in doxorubicin-induced cardiotoxicity.
• To identify the E3 ubiquitin ligase responsible for GPX4 ubiquitination in DIC.
• To explore NEDD4L as a potential therapeutic target for DIC.

Main Methods:

• Western blotting to detect protein ubiquitination and expression.
• Immunoprecipitation to assess protein-protein interactions.
• Cell viability assays and TUNEL staining to evaluate cardiomyocyte death.
• Gene knockdown using siRNA to investigate gene function.

Main Results:

• GPX4 undergoes ubiquitinated degradation during DIC, exacerbating ferroptosis and apoptosis in cardiomyocytes.
• NEDD4L interacts with GPX4 and its expression is upregulated by DOX.
• NEDD4L knockdown alleviates DIC, ferroptosis, and apoptosis by reducing GPX4 ubiquitination and degradation.
• GPX4 is a key downstream target of NEDD4L in DOX-induced cardiomyocyte death.

Conclusions:

• NEDD4L-mediated GPX4 ubiquitination and degradation is a critical mechanism in doxorubicin-induced cardiotoxicity.
• Targeting NEDD4L may offer a novel therapeutic strategy for preventing and treating DIC.