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Recent advances in arginine metabolism
1Department of Molecular Genetcs and Biochemistry, University of Pittsburgh School of Medicine, Pittsburgh, Philadelphia 15261, USA. smorris@pitt.edu
Current Opinion in Clinical Nutrition and Metabolic Care
|April 20, 2004
Summary
Arginase enzymes play crucial roles in health and disease by influencing nitric oxide, proline, and polyamine synthesis. Recent studies reveal new functions for arginases and advance understanding of arginine metabolism and the urea cycle.
Area of Science:
- Biochemistry
- Molecular Biology
- Physiology
Background:
- Arginine metabolism is critical, particularly its role as a nitric oxide precursor.
- Arginine transport and catabolism via arginases, arginine decarboxylase, and agmatinase are less understood.
- The urea cycle is a key pathway involving arginine metabolism.
Purpose of the Study:
- To review recent advancements in urea cycle, agmatine metabolism, and arginase research.
- To highlight the significance of arginine metabolism beyond nitric oxide synthesis.
Main Methods:
- Review of recent scientific literature.
- Analysis of studies on gene cloning and protein expression.
- Investigation of enzyme regulation and tissue-specific expression.
Main Results:
- Cloning of complementary DNA for agmatinase, N-acetylglutamate synthetase, and mitochondrial arginine transport proteins.
- Identification of novel roles for arginases in health and disease.
- Understanding of arginase impact on nitric oxide, proline, polyamine synthesis, and gene expression via arginine availability.
Conclusions:
- Refined understanding of the urea cycle.
- Agmatine metabolism remains under-investigated, but cDNA cloning may spur research.
- Emerging research highlights significant new roles for arginases in various diseases.