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Podocyturia in Fabry disease.

Ester Miranda Pereira1, Adalberto Socorro da Silva1, Anatália Labilloy1

  • 1Universidade Federal do Piauí, Brazil.

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|April 7, 2016
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Summary

Urinary podocyte excretion is elevated in Fabry disease patients, indicating kidney damage. This podocyturia may serve as an early marker for monitoring Fabry disease nephropathy before changes in albumin: creatinine ratio (ACR) appear.

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Area of Science:

  • Nephrology
  • Genetics
  • Biochemistry

Background:

  • Fabry disease is a genetic lysosomal storage disorder caused by GLA gene mutations, leading to reduced alpha-galactosidase A (α-GAL) activity.
  • This deficiency results in globotriaosylceramide (Gb3) accumulation, primarily affecting the kidneys and causing progressive renal dysfunction.
  • Podocyte injury is a key factor in Fabry disease nephropathy, potentially preceding clinical signs like microalbuminuria.

Purpose of the Study:

  • To quantify urinary podocyte excretion in Fabry disease patients with the V269M mutation.
  • To compare podocyturia levels between Fabry disease patients and healthy controls.
  • To investigate correlations between podocyturia and clinical factors including gender, age, therapy duration, and albumin: creatinine ratio (ACR).

Main Methods:

  • Urinary podocytes were identified and quantified using immunofluorescence staining for podocalyxin.
  • DAPI staining was used for cell nuclei identification.
  • The average number of podocytes per milliliter of urine was calculated and compared between groups.

Main Results:

  • Fabry disease patients exhibited significantly higher urinary podocyte counts compared to healthy controls (p < 0.0001).
  • A significant positive correlation was found between podocyturia and ACR (p = 0.004, r² = 0.6417).
  • No significant correlations were observed between podocyturia and gender, age, or duration of therapy.

Conclusions:

  • Urinary podocyte excretion (podocyturia) is a valuable indicator for assessing kidney disease in Fabry disease.
  • Podocyturia can serve as an early diagnostic tool for monitoring Fabry disease nephropathy, potentially detecting renal changes before ACR elevation.
  • This finding offers a promising method for evaluating disease progression, especially in patients with aggressive phenotypes.