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• W4383711092 abstract "Mucopolysaccharidosis type II (MPSII) is a rare pediatric X-linked lysosomal storage disease, caused by heterogeneous mutations in the iduronate-2-sulfatase (IDS) gene, which result in accumulation of heparan sulfate (HS) and dermatan sulfate within cells. This leads to severe skeletal abnormalities, hepatosplenomegaly, and cognitive deterioration. The progressive nature of the disease is a huge obstacle to achieve full neurological correction. Although current therapies can only treat somatic symptoms, a lentivirus-based hematopoietic stem cell gene therapy (HSCGT) approach has recently achieved improved central nervous system (CNS) neuropathology in the MPSII mouse model following transplant at 2 months of age. In this study, we evaluate neuropathology progression in 2-, 4- and 9-month-old MPSII mice, and using the same HSCGT strategy, we investigated somatic and neurological disease attenuation following treatment at 4 months of age. Our results showed gradual accumulation of HS between 2 and 4 months of age, but full manifestation of microgliosis/astrogliosis as early as 2 months. Late HSCGT fully reversed the somatic symptoms, thus achieving the same degree of peripheral correction as early therapy. However, late treatment resulted in slightly decreased efficacy in the CNS, with poorer brain enzymatic activity, together with reduced normalization of HS oversulfation. Overall, our findings confirm significant lysosomal burden and neuropathology in 2-month-old MPSII mice. Peripheral disease is readily reversible by LV.IDS-HSCGT regardless of age of transplant, suggesting a viable treatment for somatic disease. However, in the brain, higher IDS enzyme levels are achievable with early HSCGT treatment, and later transplant seems to be less effective, supporting the view that the earlier patients are diagnosed and treated, the better the therapy outcome." @default.
• W4383711092 created "2023-07-11" @default.
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• W4383711092 date "2023-08-30" @default.
• W4383711092 modified "2023-09-24" @default.
• W4383711092 title "Establishment of the effectiveness of early versus late stem cell gene therapy in Mucopolysaccharidosis II for treating central versus peripheral disease" @default.
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• W4383711092 doi "https://doi.org/10.1089/hum.2023.002" @default.
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