Urine acylcarnitine analysis by ESI-MS/MS: A new tool for the diagnosis of peroxisomal biogenesis disorders

Guglielmo Duranti, Sara Boenzi, Cristiano Rizzo, Lucilla Ravà, Vincenzo Di Ciommo, Rosalba Carrozzo, Maria Chiara Meschini, David W. Johnson, Carlo Dionisi-Vici

Research output: Contribution to journalArticle

Abstract

Background: Patients with peroxisomal biogenesis disorders (PBDs) have an abnormal profile of circulating acylcarnitines (i.e. elevated C16:0-DC-, C18:0-DC-, C24:0-, C26:0-carnitine). We developed an ESI-MS/MS method for quantification of urine acylcarnitines and tested its reliability for the diagnosis of PBDs. Methods: Urine from 7 patients with PBDs (5 Zellweger syndrome, 2 infantile Refsum disease), from 2 patients with D-bifunctional protein (D-BP) deficiency, and from 130 healthy controls were analysed by ESI-MS/MS, using a multiple reactions monitoring (MRM) method, and quantified with labelled internal standards. Acylcarnitine levels between groups were analyzed by the STATA™ statistics data analysis and compared by the non parametric Mann-Whitney test. Results: In PBDs, the urinary excretion of long-chain dicarboxylylcarnitines (C14:0-DC-, C16:0-DC-, and C18:0-DC-carnitine), and of very long-chain monocarboxylylcarnitines (C22:0-, C24:0-, C26:0-carnitine) were significantly elevated compared to controls (p <0.0001). Interestingly, among PBDs the most severe abnormalities of acylcarnitine profile were observed in patients with Zellweger syndrome. One patient with D-BP showed similar abnormalities to PBDs, while in the other only C16:0-DC-carnitine was markedly elevated. Conclusions: This study shows that MRM ESI-MS/MS acylcarnitine analysis unequivocally discriminates patients with PBDs and D-BP deficiency from controls, representing a reliable and sensitive method for the diagnosis that requires a short-time analysis with high sample through-put.

Original languageEnglish
Pages (from-to)86-89
Number of pages4
JournalClinica Chimica Acta
Volume398
Issue number1-2
DOIs
Publication statusPublished - Dec 2008

Keywords

  • Acylcarnitines
  • ESI-MS/MS
  • Infantile Refsum disease
  • Peroxisomal biogenesis disorders
  • Tandem mass spectrometry
  • Zellweger syndrome

ASJC Scopus subject areas

  • Biochemistry
  • Clinical Biochemistry
  • Biochemistry, medical

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