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- W2003452989 abstract "Rimmed vacuoles in sporadic inclusion body myositis (s-IBM) contain nuclear remnants. We sought to determine if the nuclear degeneration seen in s-IBM is associated with DNA damage. In muscle biopsy specimens from ten patients with s-IBM and 50 controls, we immunolocalized 1) phosphorylated histone H2AX (γ-H2AX), which is a sensitive immunocytochemical marker of DNA double-strand breaks and 2) DNA-PK, which is an enzyme involved in double-strand break repair. In s-IBM, vacuolar peripheries often showed strong immunoreactivity to γ-H2AX and the three components of DNA-PK (DNA-PKcs, Ku70, and Ku80). A triple fluorescence study of Ku70, emerin, and DNA displayed nuclear breakdown and it suggested impaired nuclear incorporation of Ku70. The percentage of positive nuclei for γ-H2AX was significantly higher in vacuolated fibers than non-vacuolated fibers in s-IBM, or fibers in polymyosits. We hypothesize that a dysfunction of nuclear envelope may cause nuclear fragility, double-strand breaks and impaired nuclear transport in s-IBM." @default.
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- W2003452989 date "2011-05-01" @default.
- W2003452989 modified "2023-09-27" @default.
- W2003452989 title "Myonuclear breakdown in sporadic inclusion body myositis is accompanied by DNA double strand breaks" @default.
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- W2003452989 doi "https://doi.org/10.1016/j.nmd.2011.02.004" @default.
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