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Urea synthesis in rats fed diet containing kidney beans
P W Scislowski1, G Grant, I Harris
1Rowett Research Institute, Aberdeen, Scotland.
Biochemistry International
|October 1, 1992
Summary
Feeding rats kidney beans (Phaseolus vulgaris) significantly increased urea excretion and liver mitochondrial citrulline production. This suggests a novel dietary impact on urea metabolism.
Area of Science:
- Biochemistry
- Animal Nutrition
- Physiology
Background:
- Dietary components can significantly influence metabolic pathways.
- Kidney beans (Phaseolus vulgaris) are a common food source with potential physiological effects.
- Understanding the impact of specific foods on urea metabolism is crucial for nutritional science.
Purpose of the Study:
- To investigate the effect of a kidney bean-rich diet on urea excretion in rats.
- To examine the influence of kidney bean consumption on liver mitochondrial function, specifically citrulline production.
- To explore the underlying mechanisms of altered urea production.
Main Methods:
- Rats were fed a diet containing kidney beans.
- Urea excretion levels were measured.
- Liver mitochondria were isolated and assayed for citrulline production in the presence of arginine.
- Activities of urea cycle enzymes and N-acetylglutamate synthetase were compared between diet groups.
Main Results:
- Kidney bean consumption led to a 3-5 fold increase in urea excretion.
- Isolated liver mitochondria from kidney bean-fed rats showed a 40% increase in citrulline production.
- No significant differences were observed in the activities of urea cycle enzymes or N-acetylglutamate synthetase between kidney bean and control diets.
Conclusions:
- Dietary kidney beans acutely increase urea production in rats.
- Enhanced mitochondrial citrulline production appears to be a key factor in this response.
- The mechanism is independent of changes in key urea cycle enzyme activities.