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Pathophysiology of uric acid nephrolithiasis
Orson W Moe1, Nicola Abate, Khashayar Sakhaee
1Department of Internal Medicine, Center for Mineral Metabolism and Clinical Research, Center of Human Nutrition, University of Texas Southwestern Medical Center, Department of Veteran Affairs Medical Center, Dallas, TX, USA. orson.moe@utsouthwestern.edu
Endocrinology and Metabolism Clinics of North America
|December 12, 2002
Summary
Human nitrogen excretion involves uric acid and ammonia. Imbalances can cause uric acid kidney stones, potentially linked to insulin resistance and mild ammonium excretion defects.
Area of Science:
- Nephrology
- Metabolic Disorders
- Urology
Background:
- Humans excrete nitrogen primarily as urea, but retain pathways for uric acid and ammonia excretion.
- Imbalances in these secondary nitrogen excretion pathways can lead to uric acid precipitation in urine.
- Uric acid nephrolithiasis is multifactorial, involving hyperuricosuria, acidic urine pH, and low urinary volume.
Purpose of the Study:
- To explore the link between idiopathic uric acid nephrolithiasis and insulin resistance.
- To investigate a potential novel renal manifestation of insulin resistance: a mild defect in ammonium excretion.
Main Methods:
- The abstract does not specify methods, but implies clinical observation and biochemical analysis related to nitrogen excretion and insulin resistance markers.
Main Results:
- A subset of idiopathic uric acid nephrolithiasis, termed gouty diathesis, may indicate underlying insulin resistance.
- Insulin resistance can manifest as a mild defect in ammonium excretion, not affecting overall acid-base balance.
- This mild defect is sufficient to promote the chemical environment conducive to uric acid stone formation.
Conclusions:
- Insulin resistance may be an underrecognized cause of uric acid nephrolithiasis.
- Mild defects in ammonium excretion, associated with insulin resistance, contribute to uric acid stone disease.
- Further research is warranted to elucidate the full spectrum of renal manifestations of insulin resistance.