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Erschienen in: Journal of Inherited Metabolic Disease 2/2014

01.03.2014 | Original Article

Non-specific accumulation of glycosphingolipids in GNE myopathy

verfasst von: Katherine A. Patzel, Tal Yardeni, Erell Le Poëc-Celic, Petcharat Leoyklang, Heidi Dorward, Dominic S. Alonzi, Nikolay V. Kukushkin, Bixue Xu, Yongmin Zhang, Matthieu Sollogoub, Yves Blériot, William A. Gahl, Marjan Huizing, Terry D. Butters

Erschienen in: Journal of Inherited Metabolic Disease | Ausgabe 2/2014

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Abstract

Background

UDP-GlcNAc 2-epimerase/ManNAc 6-kinase (GNE) is a bifunctional enzyme responsible for the first committed steps in the synthesis of sialic acid, a common terminal monosaccharide in both protein and lipid glycosylation. GNE mutations are responsible for a rare autosomal recessive neuromuscular disorder, GNE myopathy (also called hereditary inclusion body myopathy). The connection between the impairment of sialic acid synthesis and muscle pathology in GNE myopathy remains poorly understood.

Methods

Glycosphingolipid (GSL) analysis was performed by HPLC in multiple models of GNE myopathy, including patients’ fibroblasts and plasma, control fibroblasts with inhibited GNE epimerase activity through a novel imino sugar, and tissues of GneM712T/M712T knock-in mice.

Results

Not only neutral GSLs, but also sialylated GSLs, were significantly increased compared to controls in all tested models of GNE myopathy. Treatment of GNE myopathy fibroblasts with N-acetylmannosamine (ManNAc), a sialic acid precursor downstream of GNE epimerase activity, ameliorated the increased total GSL concentrations.

Conclusion

GNE myopathy models have increased total GSL concentrations. ManNAc supplementation results in decrease of GSL levels, linking abnormal increase of total GSLs in GNE myopathy to defects in the sialic acid biosynthetic pathway. These data advocate for further exploring GSL concentrations as an informative biomarker, not only for GNE myopathy, but also for other disorders of sialic acid metabolism.
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Metadaten
Titel
Non-specific accumulation of glycosphingolipids in GNE myopathy
verfasst von
Katherine A. Patzel
Tal Yardeni
Erell Le Poëc-Celic
Petcharat Leoyklang
Heidi Dorward
Dominic S. Alonzi
Nikolay V. Kukushkin
Bixue Xu
Yongmin Zhang
Matthieu Sollogoub
Yves Blériot
William A. Gahl
Marjan Huizing
Terry D. Butters
Publikationsdatum
01.03.2014
Verlag
Springer Netherlands
Erschienen in
Journal of Inherited Metabolic Disease / Ausgabe 2/2014
Print ISSN: 0141-8955
Elektronische ISSN: 1573-2665
DOI
https://doi.org/10.1007/s10545-013-9655-6

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