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Glyoxylate synthesis, and its modulation and influence on oxalate synthesis
1Department of Urology, Wake Forest University School of Medicine, Winston-Salem, North Carolina, USA.
Purpose:
We define the major pathways of hepatic oxalate synthesis in humans, examine the association with other metabolic pathways and identify ways that oxalate synthesis may be modified. In addition, we suggest what is required for further progress in this area.
Materials And Methods:
We consolidated relevant data primarily from recently published literature, considered new pharmacological approaches to decrease oxalate synthesis, and formulated an overview of the regulation and modification of oxalate synthesis pathways.
Results:
Experiments with animals, including humans, animal cells and in vitro preparations of cellular components, support the existence of a major metabolic pathway linking the amino acids serine, glycine and alanine. Oxalate synthesis is a minor, secondary reaction of a cascade of reactions termed the glyoxylate pathway, which has a prominent role in gluconeogenesis and ureagenesis. The enzymatic steps and effectors which regulate glyoxylate and oxalate synthesis are not well characterized. Pharmacological approaches can reduce oxalate synthesis by diminishing the glyoxylate pool and possibly modifying enzymatic reactions leading to glyoxylate synthesis.
Conclusions:
The individual steps associated with glyoxylate and oxalate synthesis can be identified. The glyoxylate pathway has a significant functional role in intermediary liver metabolism but the way it is regulated is uncertain. Oxalate synthesis can be modified by drugs, indicating that primary and idiopathic hyperoxaluria may respond to pharmacological intervention.
Insights
Hepatic oxalate synthesis, a minor pathway linked to amino acids, can be targeted by drugs. This offers potential therapeutic strategies for hyperoxaluria by modifying the glyoxylate pathway.
Area of Science:
- Biochemistry
- Metabolic pathways
- Human physiology
Background:
- Oxalate synthesis in the liver is not fully understood.
- Its connection to other metabolic processes requires clarification.
- Understanding regulation is key for therapeutic development.
Purpose of the Study:
- Define hepatic oxalate synthesis pathways in humans.
- Examine links to other metabolic pathways.
- Identify methods to modify oxalate synthesis.
Main Methods:
- Literature review of recent publications.
- Consideration of novel pharmacological approaches.
- Formulation of an overview of pathway regulation.
Main Results:
- Oxalate synthesis is a secondary reaction of the glyoxylate pathway.
- This pathway links amino acids like serine, glycine, and alanine.
- Pharmacological interventions can reduce oxalate synthesis by altering the glyoxylate pool.
Conclusions:
- Individual steps of glyoxylate and oxalate synthesis are identifiable.
- The glyoxylate pathway is crucial in liver metabolism, but regulation is unclear.
- Drug-induced modification of oxalate synthesis suggests potential for treating hyperoxaluria.