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.jpg): Failed to open stream: No such file or directory in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 117 J+Am+Soc+Mass+Spectrom
2016 ; 27
(4
): 719-25
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A Novel Rapid MALDI-TOF-MS-Based Method for Measuring Urinary
Globotriaosylceramide in Fabry Patients
#MMPMID26797827
Alharbi FJ
; Geberhiwot T
; Hughes DA
; Ward DG
J Am Soc Mass Spectrom
2016[Apr]; 27
(4
): 719-25
PMID26797827
show ga
Fabry disease is an X-linked lysosomal storage disorder caused by deficiency of
?-galactosidase A, resulting in the accumulation of glycosphingolipids in various
organs. Globotriaosylceramide (Gb3) and its isoforms and analogues have been
identified and quantified as biomarkers of disease severity and treatment
efficacy. The current study aimed to establish rapid methods for urinary Gb3
extraction and quantitation. Urine samples from 15 Fabry patients and 21 healthy
control subjects were processed to extract Gb3 by mixing equal volumes of urine,
methanol containing an internal standard, and chloroform followed by sonication
and centrifugation. Thereafter, the lower phase was analyzed by MALDI-TOF MS and
the relative peak areas of the internal standard and four major species of Gb3
determined. The results showed high reproducibility with intra- and inter-assay
coefficients variation of 9.9% and 13.7%, respectively. The limit of detection
was 0.15 ng/?L and the limit of quantitation was 0.30 ng/?L. Total urinary Gb3
levels in both genders of classic Fabry patients were significantly higher than
in healthy controls (p < 0.0001). Gb3 levels in Fabry males were higher than in
Fabry females (p = 0.08). We have established a novel assay for urinary total Gb3
that takes less than 15 min from start to finish. Graphical Abstract ?.