Alterations of membrane lipids and in gene expression of ganglioside metabolism in different brain structures in a mouse model of mucopolysaccharidosis type I (MPS I) |
| |
Authors: | Fernando Kreutz,Fernanda dos Santos Petry,Melissa Camassola,Vanessa Schein,Fá tima C.R. Guma,Nance Beyer Nardi,Vera Maria Treis Trindade |
| |
Affiliation: | 1. Programa de Pós-Graduação em Ciências Biológicas: Bioquímica – Instituto de Ciências Básica da Saúde – Universidade Federal do Rio Grande Sul, Brazil;2. Departamento de Bioquímica, Instituto de Ciências Básicas da Saúde, Universidade Federal do Rio Grande do Sul, Porto Alegre, RS, Brazil;3. Programa de Pós-graduação em Biologia Celular e Molecular Aplicada à Saúde, Universidade Luterana do Brasil, Canoas, RS, Brazil;4. Departamento de Genética, Instituto de Biociências, Universidade Federal do Rio Grande do Sul, Porto Alegre, RS, Brazil |
| |
Abstract: | Mucopolysaccharidosis I (MPS I) is a congenital disorder caused by the deficiency of α-l-iduronidase (IDUA), with the accumulation of glycosaminoglycans (GAGs) in the CNS. Although GAG toxicity is not fully understood, previous works suggest a GAG-induced alteration in neuronal membrane composition. This study is aimed to evaluate the levels and distribution of gangliosides and cholesterol in different brain regions (cortex, cerebellum, hippocampus and hypothalamus) in a model using IDUA knockout (KO) mice (C57BL/6). Lipids were extracted with chloroform–methanol and then total gangliosides and cholesterol were determined, followed by ganglioside profile analyses. While no changes in cholesterol content were observed, the results showed a tissue dependent ganglioside alteration in KO mice: a total ganglioside increase in cortex and cerebellum, and a selective presence of GM3, GM2 and GD3 gangliosides in the hippocampus and hypothalamus. To elucidate this, we evaluated gene expression of ganglioside synthesis (GM3, GD3 and GM2/GD2 synthases) and degradation of (Neuraminidase1) enzymes in the cerebellum and hippocampus by RT-sq-PCR. The results obtained with KO mice showed a reduced expression of GD3 and GM2/GD2 synthases and Neuraminidase1 in cerebellum; and a decrease in GM2/GD2 synthase and Neuraminidase1 in the hippocampus. These data suggest that the observed ganglioside changes result from a combined effect of GAGs on ganglioside biosynthesis and degradation. |
| |
Keywords: | CNS, Central Nervous System GAGs, glycosaminoglycans HPTLC, high performance thin-layer chromatography IDUA, α-l-iduronidase KO, Knockout MPS I, Mucopolysaccharidosis I NANA, N-acetyl-neuraminic acid Neu1, Neuraminidase 1 RT-sq-PCR, Semi quantitative Polymerase Chain Reaction TLC, thin-layer chromatography |
本文献已被 ScienceDirect 等数据库收录! |
|