Manipulation with Mutational Status of VHL Regulates Hypoxic Metabolism and Pro-Angiogenic Phenotypes in ccRCC Caki-1...

Area of Science:

• Oncology
• Molecular Biology
• Genetics

Background:

• Clear cell renal cell carcinoma (ccRCC) is the most common kidney cancer, often driven by VHL gene inactivation.
• VHL dysfunction leads to constitutive HIF2α activation, promoting tumor growth and aggressive phenotypes.
• The therapeutic benefits of restoring VHL function in ccRCC are not well understood.

Purpose of the Study:

• To investigate the functional consequences of VHL inactivation and restoration in ccRCC.
• To explore the role of VHL in regulating hypoxia-inducible factors and angiogenesis.
• To assess the potential of VHL restoration as a therapeutic strategy for ccRCC.

Main Methods:

• Utilized Cas9 gene editing to induce VHL mutations in the Caki-1 ccRCC cell line.
• Employed single-cell transcriptomics to analyze gene expression differences between VHL-positive and -negative cells.
• Examined the impact of VHL status on hypoxia-related pathways, glycolysis, and angiogenesis-associated genes.

Main Results:

• VHL inactivation augmented hypoxia-like pathways and anaerobic glycolysis in ccRCC cells.
• Restoration of functional VHL reversed these changes and modulated angiogenesis-related gene expression.
• Single-cell analysis revealed distinct cellular compositions and gene expression profiles in VHL-positive versus VHL-negative cells, correlating with tumor aggressiveness.
• Identified angiogenesis-related genes linked to clinical outcomes in ccRCC patients.

Conclusions:

• VHL inactivation promotes aggressive ccRCC phenotypes through hypoxia and altered glycolysis.
• VHL restoration can reverse these pro-tumorigenic pathways and modulate angiogenesis.
• Targeting VHL may represent a viable therapeutic approach to mitigate high-risk features in ccRCC.