Abstract
Mucopolysaccharidosis (MPS) type I (Hurler syndrome) is a lysosomal storage disorder characterized by deficiency of alpha-L-iduronidase (IDUA), intracellular storage of glycosaminoglycans (GAGs) and progressive neurological pathology. The MPS I mouse model provides an opportunity to study the pathophysiology of this disorder and to determine the efficacy of novel therapies. Previous work has demonstrated a series of abnormalities in MPS I mice behavior, but so far some important brain functions have not been addressed. Therefore, in the present study we aimed to determine if MPS I mice have motor abnormalities, and at what age they become detectable. MPS I and normal male mice from 2 to 8 months of age were tested in open-field for locomotor activity, hindlimb gait analysis and hang wire performance. We were able to detect a progressive reduction in the crossings and rearings in the open field test and in the hang wire test in MPS I mice from 4 months, as well as a reduction in the gait length at 8 months. Histological examination of 8-month old mice cortex and cerebellum revealed storage of GAGs in Purkinje cells and neuroinflammation, evidenced by GFAP immunostaining. However TUNEL staining was negative, suggesting that death...Continue Reading
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