Abstract
Mucopolysaccharidosis type II (MPSII) is a rare X-linked lysosomal storage disorder caused by mutations in the iduronate-2-sulfatase (IDS) gene (IDS, Xq28). MPSII is characterized by skeletal deformities, hearing loss, airway obstruction, hepatosplenomegaly, cardiac valvular disease, and progressive neurological impairment. At the cellular level, IDS deficiency leads to lysosomal storage of glycosaminoglycans (GAGs), dominated by accumulation of dermatan and heparan sulfates. Human induced pluripotent stem cells (iPSC) represent an alternative system that complements the available MPSII murine model. Herein we report on the reprogramming of peripheral white blood cells from male and female MPSII patients into iPSC using a non-integrating protocol based on the Sendai virus vector system. We differentiated the iPSC lines into IDS deficient and GAG accumulating β-Tubulin III+ neurons, GFAP+ astrocytes, and CNPase+ oligodendrocytes. The lysosomal system in these cells displayed structural abnormalities reminiscent of those previously found in patient tissues and murine IDS deficient neuronal stem cells. Furthermore, quantitative determination of GAGs revealed a moderate increase in GAG levels in IDS deficient neurons and glia. We also tested the effects of recombinant IDS and found that the exogenous enzyme was internalized from the culture media and partially decreased the intracellular GAG levels in iPSC-derived neural cells; however, it failed to completely prevent accumulation of GAGs. In summary, we demonstrate that this human iPSC based model expresses the cellular and biochemical features of MPSII, and thus represents a useful experimental tool for further pathogenesis studies as well as therapy development and testing.
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Abbreviations
- ALP:
-
alkaline phosphatase
- BBB:
-
blood brain barrier
- bFGF:
-
basic fibroblast growth factor
- βTubIII:
-
β-Tubulin III
- CNPase:
-
2′,3′-cyclic-nucleotide 3′-phosphodiesterase
- EB:
-
embryoid bodies
- ERT:
-
enzyme replacement therapy
- FGF-8:
-
fibroblast growth factor 8
- GAG:
-
glycosaminoglycans
- GFAP:
-
glial fibrillary acidic protein
- HS:
-
heparan sulfate
- IDS:
-
iduronate-2-sulfatase
- iPSC:
-
induced pluripotent stem cells
- LAMP1:
-
lysosomal-associated membrane protein 1
- MAP2:
-
microtubule-associated protein 2
- MPS:
-
mucopolysaccharidoses
- NPC:
-
neural progenitor cells
- PBMC:
-
peripheral blood mononuclear cells
- P/S:
-
Penicillin-Streptomycin
- TH:
-
tyrosine hydroxylase
- XCI:
-
X-chromosome inactivation
- CDM:
-
complete differentiation medium
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Acknowledgments
The authors thank Irena Knesplova and Dr. Filip Majer for their technical assistance and Dr. Martin Magner for assistance with collection of patient samples and clinical evaluation.
Funding
This work was funded by a research grant of the Medical Research Agency of The Czech Republic, AZV ČR 15-33297A.
The authors confirm independence from the sponsors; the content of the article was not influenced by the sponsors.
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Jitka Rybova, Robert Dobrovolny, Jana Ledvinova, Jakub Sikora and Ladislav Kuchar declare no competing interests but disclose the following: Robert Dobrovolny and Jitka Rybova have received honoraria for lectures and/or hotel/travel expenses for relevant meetings from Shire, plc.
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This article does not contain any studies with animal subjects performed by any of the authors.
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J. Rybova, J. Ledvinova, J. Sikora, L. Kuchar, R. Dobrovolny declare that they have no conflict of interest.
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Communicated by: Jaak Jaeken
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Rybová, J., Ledvinová, J., Sikora, J. et al. Neural cells generated from human induced pluripotent stem cells as a model of CNS involvement in mucopolysaccharidosis type II. J Inherit Metab Dis 41, 221–229 (2018). https://doi.org/10.1007/s10545-017-0108-5
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DOI: https://doi.org/10.1007/s10545-017-0108-5