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- W2010275872 abstract "Increased amyloid-β precursor protein (AβPP) and amyloid-β (Aβ) accumulation appear to be upstream steps in the pathogenesis of sporadic inclusion-body myositis (s-IBM). BACE1, participating in Aβ production is also increased in s-IBM muscle fibers. Nogo-B and Nogo-A belong to a family of integral membrane reticulons, and Nogo-B binding to BACE1 blocks BACE1 access to AβPP, decreasing Aβ production. We studied Nogo-B and Nogo-A in s-IBM muscle and in our IBM muscle culture models, based on AβPP-overexpression or ER-stress-induction in cultured human muscle fibers (CHMFs). We report that: (1) in biopsied s-IBM fibers, Nogo-B is increased, accumulates in aggregates, is immuno-co-localized with BACE1, and binds to BACE1; Nogo-A is undetectable. (2) In CHMFs, (a) AβPP overexpression increases Nogo-B, Nogo-A, and BACE1, (b) ER stress increases BACE1 but decreases Nogo-B and Nogo-A, (c) Nogo-B and Nogo-A associate with BACE1. Accordingly, two novel mechanisms, AβPP overexpression and ER stress, are involved in Nogo-B and Nogo-A expression in human muscle. We propose that in s-IBM muscle the Nogo-B increase may represent an attempt by muscle fiber to decrease Aβ production. However, the increase of Nogo-B seems insufficient because Aβ continues to accumulate and the disease progresses. We propose that manipulations, which increase Nogo-B in s-IBM muscle might offer a new therapeutic opportunity." @default.
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- W2010275872 date "2007-08-31" @default.
- W2010275872 modified "2023-09-28" @default.
- W2010275872 title "NOGO is increased and binds to BACE1 in sporadic inclusion-body myositis and in AβPP-overexpressing cultured human muscle fibers" @default.
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- W2010275872 doi "https://doi.org/10.1007/s00401-007-0281-y" @default.
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