Mitochondrial UQCC3 controls embryonic and tumor angiogenesis by regulating VEGF expression

Area of Science:

• Cell Biology
• Mitochondrial Biology
• Vascular Biology

Background:

• Mitochondria are vital for angiogenesis, but the underlying mechanisms are not fully understood.
• Identifying key regulators of angiogenesis is crucial for understanding development and disease.

Purpose of the Study:

• To investigate the role of mitochondrial ubiquinol-cytochrome c reductase complex assembly factor 3 (UQCC3) in angiogenesis.
• To elucidate the molecular mechanisms by which UQCC3 regulates vascular development and tumor growth.

Main Methods:

• TALEN-mediated gene knockout in mice and zebrafish models.
• Assessment of embryonic lethality, vascular development, and tumor growth.
• Analysis of reactive oxygen species (ROS) generation, HIF-1α stability, and VEGF expression under hypoxia.

Main Results:

• Uqcc3 knockout led to embryonic lethality and severely impaired vascularization in mice and zebrafish.
• Loss of UQCC3 significantly reduced tumor growth and angiogenesis.
• UQCC3 upregulation under hypoxia promotes ROS generation, stabilizes HIF-1α, and increases VEGF expression.

Conclusions:

• UQCC3 is a critical regulator of angiogenesis in both physiological and pathological contexts.
• UQCC3 expression correlates with poor prognosis in various cancers, suggesting its role in tumor progression.
• UQCC3 represents a potential therapeutic target for inhibiting cancer angiogenesis.