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Pseudoxanthoma elasticum and nephrolithiasis.

B Fabre1, P Bayle, J Bazex

  • 1Service de Dermatologie, CHU Purpan, 31059 Toulouse cedex, France.

Journal of the European Academy of Dermatology and Venereology : JEADV
|March 9, 2005
PubMed
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This study highlights a patient with pseudoxanthoma elasticum (PXE) and kidney stones. The research explores the potential role of the ABCC6 gene mutation in phosphocalcic metabolism disturbances.

Area of Science:

  • Nephrology
  • Genetics
  • Biochemistry

Background:

  • Pseudoxanthoma elasticum (PXE) is a rare genetic disorder characterized by calcification of elastic tissues.
  • Recurrent nephrolithiasis presents a significant clinical challenge, often linked to metabolic abnormalities.

Observation:

  • A 42-year-old male with diagnosed PXE presented with recurrent bilateral kidney stones.
  • Diagnostic workup revealed hypophosphatemia, hyperphosphaturia, hypercalciuria, and a calcium oxalate stone.
  • Genetic analysis identified a homozygous R1138Q mutation in the ABCC6 gene.

Findings:

  • The ABCC6 gene encodes the multidrug resistance-associated protein 6 (MRP6), crucial in liver and kidney function.
  • The patient exhibited significant phosphocalcic dysregulation, including elevated 1,25-dihydroxy vitamin D levels.

Related Experiment Videos

  • The study links PXE, ABCC6 mutations, and metabolic anomalies in kidney stone formation.

    • Implications:

    • The findings suggest a potential role for MRP6 in regulating phosphocalcium metabolism.
    • Understanding this link may offer new insights into managing PXE-associated complications like nephrolithiasis.
    • Further research is warranted to elucidate the precise mechanisms of MRP6 in mineral homeostasis.