Abstract
Mucopolysaccharidoses (MPS) are inherited disorders caused by the deficiency of lysosomal enzymes. Sanfilippo syndrome (MPS III) and Hunter syndrome (MPS II) are characterized by severe and mild neurological disorders, respectively, in which the neurodegenerative mechanisms remain to be clarified. We immunohistochemically examined the involvement of tauopathy/synucleinopathy, cell death and oxidative damage in the brains of three cases each of MPS IIIB and MPS II and age-matched controls. In cases of MPS IIIB, the density of GABAergic interneurons in the cerebral cortex immunoreactive for calbindin-D28K and parvalbumin was markedly reduced when compared with age-matched controls. The swollen neurons showed immunoreactivity for phosphorylated α-synuclein but not for phosphorylated tau protein or β-amyloid protein; those in the cerebral cortex demonstrated nuclear immunoreactivity for TUNEL, single-stranded DNA and 8-OHdG. Neither lipid peroxidation nor protein glycation was marked in MPS cases. The expression levels of superoxide dismutases (Cu/ZnSOD and MnSOD) and glial glutamate transporters (EAAT1 and EAAT2) were reduced in two MPS II cases. The disturbance of GABAergic interneurons can be related to mental disturbance, while synucleinopathy and/or DNA impairment may be implicated in the neurodegeneration of swelling neurons due to storage materials in MPS IIIB cases. These findings suggest the possibility of neuroprotective therapies other than enzyme replacement in MPS patients.
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Hamano, K., Hayashi, M., Shioda, K. et al. Mechanisms of neurodegeneration in mucopolysaccharidoses II and IIIB: analysis of human brain tissue. Acta Neuropathol 115, 547–559 (2008). https://doi.org/10.1007/s00401-007-0325-3
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DOI: https://doi.org/10.1007/s00401-007-0325-3