ISSN print edition: 0366-6352
ISSN electronic edition: 1336-9075
Registr. No.: MK SR 9/7
Case study: monitoring of Glc4 tetrasaccharide in the urine of Pompe patients, use of MALDI-TOF MS, and 1H NMR
Zuzana Pakanová, Mária Matulová, Iveta Uhliariková, Darina Behúlová, Anna Šalingová, Anna Hlavatá, Katarína Juríčková, Marek Nemčovič, Vladimír Pätoprstý, and Ján Mucha
Institute of Chemistry, Slovak Academy of Sciences, Bratislava, Slovakia
Abstract: Due to the lack of the acid 1,4-α-glucosidase, the urine of Pompe patients contains increased levels of specific glucose tetrasaccharide αGlc(1 → 6)αGlc(1 → 4)αGlc(1 → 4)Glc (Glc4), which was approved as a non-invasive biomarker of glycogen accumulation in the muscles of Pompe patients. MALDI-TOF mass spectrometry and 1H NMR spectroscopy were used for Glc4 detection in the urine samples of four Pompe patients with infantile, juvenile, and adult forms of the disease, before and during, or before and after, enzyme replacement therapy. The increased sensitivity and decreased urine volume required for Glc4 detection by MALDI-TOF mass spectrometry was obtained by specific derivatization directly on the MALDI plate by 3-aminoquinoline. This method is a suitable and fast method for Pompe screening. 1H NMR spectra, used for precise Glc4 quantifications, were proposed for the enzyme replacement therapy efficiency monitoring. Besides the clinical features and the biochemical parameters, knowledge about the evolution of the Glc4 levels over time during the administration of the therapy could help monitoring of the patient outcome as part of the standard protocol.
Keywords: Pompe disease ; ERT monitoring ; Glucose tetrasaccharide ; MALDI-TOF MS ; 1H NMR
Full paper is available at www.springerlink.com.
Chemical Papers 73 (3) 701–711 (2019)