UDP-N-acetylglucosamine 2-epimerase/N-acetylmannosamine kinase in nuclei and rimmed vacuoles of muscle fibers in DMRV (distal myopathy with rimmed vacuoles)
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- Ishihara Shoichiro
- Department of Neurology and Neurological Science, Graduate School, Tokyo Medical and Dental University, Tokyo, Japan
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- Tomimitsu Hiroyuki
- Department of Neurology and Neurological Science, Graduate School, Tokyo Medical and Dental University, Tokyo, Japan
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- Fujigasaki Hiroto
- Department of Neurology, Musashino Red Cross Hospital, Tokyo, Japan
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- Saito Fumiaki
- Department of Neurology and Neuroscience, Teikyo University School of Medicine, Tokyo, Japan
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- Mizusawa Hidehiro
- Department of Neurology and Neurological Science, Graduate School, Tokyo Medical and Dental University, Tokyo, Japan
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Background: UDP-N-acetylglucosamine 2- epimerase/N-acetylmannosamine kinase (GNE) is a key molecule in the pathogenesis of distal myopathy with rimmed vacuoles (DMRV) and hereditary inclusion body myopathy (HIBM) and almost all such patients have some mutations in GNE. However, subcellular localization of GNE and the mechanism of muscular damage have not been clarified. Methods: A rabbit polyclonal antibody for GNE was prepared. Immunohistochemistry was performed using anti-GNE and anti-nuclear protein antibodies. Western blotting with subcellular fractionated proteins was performed to determine subcellular localization of GNE. The sizes of myonuclei were quantified in muscle biopsies from patients with DMRV and amyotrophic lateral sclerosis (ALS). Results: In DMRV muscles, immunohistochemistry identified GNE in sarcoplasm and specifically in myonuclei and rimmed vacuoles (RV). Nuclear proteins were also found in RVs. Immunohistochemistry showed colocalization of GNE and emerin in C2C12 cells. Western blotting revealed the presence of GNE in nuclear fractions of human embryonic kidney (HEK) 293T cells. The mean size of myonuclei of DMRV was significantly larger than that of ALS. Conclusion: GNE is present in myonuclei near nuclear membrane. Our results suggest that myonuclei are involved in RV formation in DMRV, and that mutant GNE in myonuclei seems to play some role in this process.
収録刊行物
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- Journal of Medical and Dental Sciences
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Journal of Medical and Dental Sciences 55 (1), 181-187, 2008
国立大学法人 東京医科歯科大学
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詳細情報 詳細情報について
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- CRID
- 1390001205517710464
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- NII論文ID
- 130005421054
- 110006826935
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- NII書誌ID
- AA12028964
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- ISSN
- 21859132
- 13428810
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- 本文言語コード
- en
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- データソース種別
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- JaLC
- CiNii Articles
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- 使用不可