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Related Experiment Videos

Uric acid elimination in the urine. Pathophysiological implications.

Martino Marangella1

  • 1Nephrology Division and Renal Stone Centre, Mauriziano Hospital, Torino, Italy.

Contributions to Nephrology
|December 18, 2004
PubMed
Summary

Uric acid excretion is primarily regulated by extracellular fluid, not urine output. Factors like dehydration and certain drugs can cause kidney issues, but hydration and alkali therapy can prevent or treat them.

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Area of Science:

  • Nephrology
  • Urology
  • Metabolic Diseases

Background:

  • Uric acid has low pH-dependent solubility, with the kidney crucial for its elimination.
  • Renal handling of uric acid is complex, resulting in low fractional clearance.
  • Urate transporters and extracellular fluid volume significantly influence urate excretion.

Purpose of the Study:

  • To review the renal handling of uric acid and its clinical implications.
  • To discuss factors affecting urate elimination and associated renal pathologies.
  • To highlight management strategies for uric acid-related kidney problems.

Main Methods:

  • Literature review of renal uric acid handling.
  • Analysis of factors influencing urate excretion and nephropathy.

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  • Summary of clinical conditions and treatment approaches.

    • Main Results:

    • Extracellular fluid volume is the primary regulator of urate excretion.
    • Drugs and conditions like dehydration/exercise can impair urate elimination, leading to kidney issues.
    • Acute uric acid nephropathy is reversible with hydration and alkali therapy.
    • Uric acid nephrolithiasis is linked to low urine pH and supersaturation.

    Conclusions:

    • Understanding renal uric acid handling is key to managing hyperuricemia and related kidney diseases.
    • Preventive measures like hydration and alkali therapy are effective for acute uric acid nephropathy and nephrolithiasis.
    • Further research is needed on chronic urate nephropathy and the role of insulin resistance.