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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Abbreviations
- 2-AA:
-
Anthranilic acid
- CMP:
-
Cytidine monophosphate
- CMP-SA:
-
CMP-sialic acid
- CTP:
-
Cytidine triphosphate
- DMRV:
-
Distal myopathy with rimmed vacuoles
- ECL:
-
Enhanced chemiluminescence
- FCS:
-
Fetal calf serum
- GlcNAc:
-
N-acetyl glucosamine
- GNE:
-
UDP-GlcNAc 2-epimerase/ManNAc 6-kinase
- GSL:
-
Glycosphingolipid
- HIBM:
-
Hereditary inclusion body myopathy
- HPLC:
-
High-performance liquid chromatography
- HRP:
-
Horseradish peroxidase
- ManNAc:
-
N-acetylmannosamine
- MES:
-
2-(N-morpholino)ethanesulfonic acid
- Neu5AC:
-
N-acetylneuraminic acid or sialic acid
- NP-HPLC:
-
Normal-phase HPLC
- OMIM:
-
Online mendelian inheritance in man
- PVDF:
-
Polyvinylidene fluoride
- RP-HPLC:
-
Reverse-phase HPLC
- SDS-PAGE:
-
Sodium dodecyl sulfate polyacrylamide gel electrophoresis
- SEM:
-
Standard error of the mean
- THF:
-
Tetrahydrofuran
- UDP:
-
Uridine diphosphate
- XMEA:
-
X-linked myopathy with excessive autophagy
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Acknowledgments
The authors thank Professor Raymond Dwek for his support (Oxford Glycobioloby Institute). We thank Shelley Hoogstraten-Miller and Theresa Calhoun (NHGRI, NIH) for their skilled assistance with mouse maintenance and thank Carla Ciccone (NHGRI, NIH) for her expert laboratory work. We thank the HIBM Research Group (Encino, CA, USA) for providing the Gne M712T knock-in mouse model.
Funding
This work was supported by the Oxford Glycobiology Institute, Oxford, UK (K.A.P., D.S.A., N.V.K., and T.D.B.), l’Association “Vaincre les maladies lysosomales” (Y.B.) and the Intramural Research Programs of the National Human Genome Research Institute, National Institutes of Health, Bethesda, MD, USA (K.A.P., T.Y., P.L., H.D., W.A.G., and M.H.). The authors confirm independence from the sponsors; the content of the article has not been influenced by the sponsors.
Conflict of interests
Katherine A. Patzel, Tal Yardeni, Erell Le Poëc-Celic, Dominic S. Alonzi, Nikolay V. Kukushkin, Bixue Xu, Yongmin Zhang, Matthieu Sollogoub, Yves Blériot, and Terry D. Butters declare that they have no conflict of interest.
Marjan Huizing and William A. Gahl are co-inventors on patent PCT/US2008/006895 “N-acetyl mannosamine as a therapeutic agent”.
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Communicated by: Eva Morava
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Patzel, K.A., Yardeni, T., Le Poëc-Celic, E. et al. Non-specific accumulation of glycosphingolipids in GNE myopathy. J Inherit Metab Dis 37, 297–308 (2014). https://doi.org/10.1007/s10545-013-9655-6
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DOI: https://doi.org/10.1007/s10545-013-9655-6