p53-induced inhibition of Hif-1 causes cardiac dysfunction during pressure overload

Area of Science:

• Cardiovascular Biology
• Molecular Cardiology
• Heart Failure Pathophysiology

Background:

• Cardiac hypertrophy is an adaptive response to increased workload, but prolonged hypertrophy leads to heart failure.
• The precise mechanisms driving the transition from cardiac hypertrophy to heart failure remain largely unknown.

Purpose of the Study:

• To investigate the role of cardiac angiogenesis in adaptive hypertrophy.
• To elucidate the involvement of p53 in the progression from cardiac hypertrophy to heart failure.

Main Methods:

• Utilized a pressure overload model to induce cardiac hypertrophy.
• Investigated the role of hypoxia-inducible factor-1 (Hif-1) and angiogenic factors in cardiac vascularization.
• Examined the impact of p53 accumulation on angiogenesis and cardiac function.

Main Results:

• Pressure overload initially stimulated cardiac angiogenesis via Hif-1-dependent pathways.
• Inhibition of angiogenesis exacerbated systolic dysfunction during hypertrophy.
• Sustained pressure overload led to p53 accumulation, inhibiting Hif-1 and impairing angiogenesis.
• Enhancing angiogenesis or inhibiting p53 improved cardiac function under chronic pressure overload.

Conclusions:

• Cardiac angiogenesis is critical for the adaptive response to hypertrophy.
• p53 accumulation plays a key role in the transition to heart failure by inhibiting angiogenesis.
• Targeting p53 or promoting angiogenesis may offer therapeutic strategies for heart failure.