Abstract:
:The cause of neurodegeneration in MPS mouse models is the focus of much debate and what the underlying cause of disease pathology in MPS mice is. The timing of development of pathology and when this can be reversed or impacted is the key to developing suitable therapies in MPS. This study is the first of its kind to correlate the biochemical changes with the functional outcome as assessed using non-invasive behaviour testing across multiple mucopolysaccharidosis (MPS) mouse models. In the MPS brain, the primary lysosomal enzyme dysfunction leads to accumulation of primary glycosaminoglycans (GAGs) with gangliosides (GM2 and GM3) being the major secondary storage products. With a focus on the neuropathology, a time course experiment was conducted in MPS I, MPS IIIA, MPS VII (severe and attenuated models) in order to understand the relative timing and level of GAG and ganglioside accumulation and how this correlates to behaviour deficits. Time course analysis from 1 to 6 months of age was conducted on brain samples to assess primary GAG (uronic acid), β-hexosaminidase enzyme activity and levels of GM2 and GM3 gangliosides. This was compared to a battery of non-invasive behaviour tests including open field, inverted grid, rotarod and water cross maze were assessed to determine effects on motor function, activity and learning ability. The results show that the GAG and ganglioside accumulation begins prior to the onset of detectable changes in learning ability and behaviour. Interestingly, the highest levels of GAG and ganglioside accumulation was observed in the MPS IIIA mouse despite having 3% residual enzyme activity. Deficits in motor function were clearly observed in the severe Gusmps/mps, which were significantly delayed in the attenuated Gustm(L175F)Sly model despite their minimal increase in detectable enzyme activity. This suggests that genotype and residual enzyme activity are not indicative of severity of disease pathology in MPS disease and there exists a window when there are considerable storage products without detectable functional deficits which may allow an alteration to occur with therapy.
journal_name
Mol Genet Metabjournal_title
Molecular genetics and metabolismauthors
Derrick-Roberts A,Kaidonis X,Jackson MR,Liaw WC,Ding X,Ong C,Ranieri E,Sharp P,Fletcher J,Byers Sdoi
10.1016/j.ymgme.2020.07.006subject
Has Abstractpub_date
2020-01-01 00:00:00pages
197-205issue
1-2eissn
1096-7192issn
1096-7206pii
S1096-7192(20)30175-Xjournal_volume
131pub_type
杂志文章abstract::Glycogen storage disease type I (GSD I) is caused by inherited defects of the glucose 6-phosphatase complex, resulting in fasting hypoglycemia, lactic acidosis, hyperuricemia and hyperlipidemia. Sixteen out of 26 (61.5%) GSD I patients in our study had suboptimal levels (<30 ng/ml) of 25-hydroxyvitamin-D (25(OH)D) des...
journal_title:Molecular genetics and metabolism
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pub_type: 杂志文章
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pub_type: 杂志文章
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pub_type: 杂志文章,评审
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更新日期:2000-09-01 00:00:00
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pub_type: 杂志文章
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更新日期:2012-01-01 00:00:00
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pub_type: 杂志文章
doi:10.1016/s1096-7192(02)00100-2
更新日期:2002-08-01 00:00:00
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pub_type: 杂志文章,评审
doi:10.1016/j.ymgme.2007.06.020
更新日期:2007-11-01 00:00:00