Roles of Fukutin, the Gene Responsible for Fukuyama-Type Congenital Muscular Dystrophy, in Neurons: Possible Involvement in Synaptic Function and Neuronal Migration
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概要
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Fukutin is a gene responsible for Fukuyama-type congenital muscular dystrophy (FCMD), accompanying ocular and brain malformations represented by cobblestone lissencephaly. Fukutin is related to basement membrane formation via the glycosylation of α-dystoglycan (α-DG), and astrocytes play a crucial role in the pathogenesis of the brain lesion. On the other hand, its precise function in neurons is unknown. In this experiment, the roles of fukutin in mature and immature neurons were examined using brains from control subjects and FCMD patients and cultured neuronal cell lines. In quantitative PCR, the expression level of fukutin looked different depending on the region of the brain examined. A similar tendency in DG expression appears to indicate a relation between fukutin and α-DG in mature neurons. An increase of DG mRNA and core α-DG in the FCMD cerebrum also supports the relation. In immunohistochemistry, dot-like positive reactions for VIA4-1, one of the antibodies detecting the glycosylated α-DG, in Purkinje cells suggest that fukutin is related to at least a post-synaptic function via the glycosylation of α-DG. As for immature neurons, VIA4-1 was predominantly positive in cells before and during migration with expression of fukutin, which suggest a participation of fukutin in neuronal migration via the glycosylation of α-DG. Moreover, fukutin may prevent neuronal differentiation, because its expression was significantly lower in the adult cerebrum and in differentiated cultured cells. A knockdown of fukutin was considered to induce differentiation in cultured cells. Fukutin seems to be necessary to keep migrating neurons immature during migration, and also to support migration via α-DG.
著者
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Osawa Makiko
Department Of Pediatrics Faculty Of Medicine Tokyo Women's Medical University
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Yamamoto Tomoko
Department Of Applied Chemistry Keio University
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Shibata Noriyuki
Department Of Pathology School Of Medicine Tokyo Women's Medical University
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Kobayashi Makio
Department of Pathology, School of Medicine, Tokyo Women's Medical University
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Kobayashi Makio
Department of Agricultural Chemistry, Faculty of Agriculture, Hokkaido University
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Hiroi Atsuko
Department of Pathology, School of Medicine, Tokyo Women's Medical University
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Hiroi Atsuko
Department of Pathology, School of Medicine, Tokyo Women's Medical University
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Yamamoto Tomoko
Department of Pathology, School of Medicine, Tokyo Women's Medical University
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