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Mechanisms causing muscle loss in chronic renal failure
D Reaich1, S R Price, B K England
1Renal Division, Emory University School of Medicine, Atlanta, GA, USA.
Summary
Metabolic acidosis in chronic kidney disease accelerates muscle protein breakdown, worsening malnutrition. Correcting acidosis with alkali therapy and adequate nutrition can improve protein balance in these patients.
Area of Science:
- Nephrology
- Metabolic Disorders
- Biochemistry
Background:
- Loss of lean body mass in uremia is linked to increased illness and death.
- Uremia can disrupt metabolic pathways essential for maintaining protein balance, especially with low protein intake.
Purpose of the Study:
- To investigate the role of metabolic acidosis in protein catabolism in uremia.
- To identify molecular mechanisms linking acidosis to muscle protein breakdown.
Main Methods:
- Examined the effects of metabolic acidosis on amino acid oxidation and protein degradation in muscle tissue.
- Investigated the involvement of glucocorticoids and messenger RNA (mRNA) expression in catabolic pathways.
Main Results:
- Metabolic acidosis was found to stimulate both amino acid oxidation and protein degradation in muscle.
- Molecular analysis revealed increased expression of catabolic pathway components, mediated by glucocorticoids.
- Clinical studies confirmed that acidosis contributes to muscle wasting in chronic renal failure patients.
Conclusions:
- Metabolic acidosis exacerbates protein catabolism in uremia by overriding adaptive responses.
- Alkali therapy and adequate dietary protein are recommended for patients with metabolic acidosis and chronic renal failure to improve protein balance.