1. Quantification of Glycosaminoglycans in Urine by Isotope‐Dilution Liquid Chromatography‐Electrospray Ionization Tandem Mass Spectrometry
- Author
-
Haoyue Zhang, David S. Millington, and Sarah P. Young
- Subjects
Quality Control ,Spectrometry, Mass, Electrospray Ionization ,Electrospray ionization ,Dermatan Sulfate ,Health Informatics ,Tandem mass spectrometry ,Mass spectrometry ,High-performance liquid chromatography ,Dermatan sulfate ,General Biochemistry, Genetics and Molecular Biology ,chemistry.chemical_compound ,Tandem Mass Spectrometry ,Genetics ,Humans ,Chondroitin sulfate ,General Pharmacology, Toxicology and Pharmaceutics ,Genetics (clinical) ,Glycosaminoglycans ,Chromatography ,General Immunology and Microbiology ,Chemistry ,General Neuroscience ,Chondroitin Sulfates ,Selected reaction monitoring ,Heparan sulfate ,Mucopolysaccharidoses ,Medical Laboratory Technology ,Biochemistry ,Keratan Sulfate ,Heparitin Sulfate ,Biomarkers ,Chromatography, Liquid - Abstract
Mucopolysaccharidoses (MPSs) are complex lysosomal storage disorders that result in the accumulation of glycosaminoglycans (GAGs) in urine, blood, and tissues. Lysosomal enzymes responsible for GAG degradation are defective in MPSs. GAGs including chondroitin sulfate (CS), dermatan sulfate (DS), heparan sulfate (HS), and keratan sulfate (KS) are disease-specific biomarkers for MPSs. This unit describes a stable isotope dilution-tandem mass spectrometric method for quantifying CS, DS, and HS in urine samples. The GAGs are methanolyzed to uronic or iduronic acid-N-acetylhexosamine or iduronic acid-N-sulfo-glucosamine dimers and mixed with internal standards derived from deuteriomethanolysis of GAG standards. Specific dimers derived from HS, DS, and CS are separated by ultra-performance liquid chromatography (UPLC) and analyzed by electrospray ionization tandem mass spectrometry (MS/MS) using selected reaction monitoring for each targeted GAG product and its corresponding internal standard. This new GAG assay is useful for identifying patients with MPS types I, II, III, VI, and VII.
- Published
- 2023
- Full Text
- View/download PDF