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Valine metabolism in normal and chronically uremic man
The American Journal of Clinical Nutrition
|September 1, 1978
Summary
Uremic patients show altered valine metabolism, with lower plasma valine levels and decreased degradation rates compared to healthy individuals. This suggests impaired valine processing in chronic kidney disease.
Area of Science:
- Biochemistry
- Renal Medicine
Background:
- Valine metabolism is crucial for protein synthesis and energy production.
- Chronic uremia, a condition associated with kidney failure, can disrupt normal metabolic processes.
Purpose of the Study:
- To investigate the metabolic fate of valine in individuals with chronic uremia.
- To compare valine metabolism between normal and uremic subjects.
Main Methods:
- Administered L-valine-1-14C intravenously to fasted normal and non-dialyzed uremic subjects.
- Monitored plasma valine specific activity and 14CO2 expiration over two hours.
- Utilized a two-pool model to analyze valine metabolic pathways.
Main Results:
- Uremic patients exhibited significantly lower plasma valine concentrations compared to normal subjects.
- Plasma valine specific activity declined slower in uremic patients, indicating reduced turnover.
- Valine degradation and irreversible loss rates were significantly decreased in uremic patients.
Conclusions:
- Chronic uremia is associated with significant alterations in valine metabolism.
- Reduced valine degradation may contribute to altered amino acid profiles in uremic patients.