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Interrelationships between gluconeogenesis and uricogenesis in chicken liver
The International Journal of Biochemistry
|January 1, 1982
Summary
Urate precursors inhibit gluconeogenesis (glucose production) in chicken liver by up to 100%. This occurs alongside increased uricogenesis, suggesting metabolic competition for ATP and other resources.
Area of Science:
- Biochemistry
- Cell Biology
- Metabolic Pathways
Background:
- Gluconeogenesis is vital for glucose homeostasis.
- Uricogenesis is the metabolic pathway for uric acid production.
- Interactions between these pathways are not fully understood.
Purpose of the Study:
- To investigate the effect of urate precursors on gluconeogenesis in avian liver.
- To explore the metabolic interplay between gluconeogenesis and uricogenesis.
Main Methods:
- Experiments utilized isolated chicken hepatocytes and perfused liver preparations.
- Measurements included gluconeogenesis rates from various substrates (lactate, glycerol, fructose).
- Urate formation rates were assessed in the presence and absence of urate precursors and specific inhibitors.
Main Results:
- Urate precursors significantly inhibited gluconeogenesis (22-100%) in chicken liver.
- This inhibition correlated with an increased rate of urate formation.
- Specific inhibitors of gluconeogenesis (2,4-Dinitrophenol, 2-bromooctanoate, 3-mercaptopicolinate) did not affect urate formation rates.
Conclusions:
- A metabolic competition for ATP and other metabolites likely exists between gluconeogenesis and uricogenesis.
- Potential interplay at the level of mitochondrial anion transfer warrants further investigation.