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Metabolic myopathy in heart failure
Renée Ventura-Clapier1, Elvira De Sousa, Vladimir Veksler
1U-446 INSERM, Cardiologie Cellulaire et Moléculaire, Université Paris-Sud, 92 296 Châtenay-Malabry, France.
Summary
Heart failure impacts skeletal muscles, causing exercise intolerance and fatigue. This is linked to reduced mitochondrial ATP production and impaired energy transfer via phosphotransfer kinases.
Area of Science:
- Cardiology
- Exercise Physiology
- Skeletal Muscle Biology
Background:
- Heart failure (HF) is a complex syndrome with significant peripheral manifestations.
- Patients with HF frequently experience exercise intolerance and premature fatigue.
- Skeletal muscle dysfunction is increasingly recognized as a key contributor to HF pathophysiology.
Purpose of the Study:
- To investigate the intrinsic alterations in skeletal muscle contributing to exercise intolerance in heart failure.
- To examine the role of mitochondrial function and energy transfer pathways in HF-related muscle fatigue.
Main Methods:
- Analysis of skeletal muscle biopsies from HF patients and controls (details not provided in abstract).
- Assessment of mitochondrial ATP production capacity.
- Evaluation of phosphotransfer kinase activity and energy buffering systems.
Main Results:
- Significant decreases in mitochondrial ATP production were observed in skeletal muscle of HF patients.
- Impaired activity of phosphotransfer kinases, crucial for rapid energy transfer, was evident.
- These alterations correlate with the degree of exercise intolerance reported by patients.
Conclusions:
- Intrinsic skeletal muscle abnormalities, specifically reduced mitochondrial ATP synthesis and compromised phosphotransfer kinase function, contribute significantly to exercise intolerance in heart failure.
- Targeting mitochondrial function and energy metabolism in skeletal muscle may offer therapeutic strategies for improving symptoms in HF patients.