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- W2085494041 abstract "Neuregulin-1 (Nrg1) is encoded by a single gene and exists in naturally secreted and transmembrane isoforms. Nrg1 exerts its signaling activity through interaction with its cognate ErbB receptors. Multiple membrane-anchored Nrg1 isoforms, present in six different membrane topologies, must be processed by a protease to initiate a signaling cascade. Here, we demonstrate that BACE1 and ADAM10 can process type I and III Nrg1 at two adjacent sites. Our cleavage site mapping experiments showed that the BACE1 cleavage site is located eight amino acids downstream of the ADAM10 cleavage site, and this order of cleavage is the opposite of amyloid precursor protein cleavage by these two enzymes. Cleavages were further confirmed via optimized electrophoresis. Cleavage of type I or III Nrg1 by ADAM10 and BACE1 released a signaling-capable N-terminal fragment (ntf), either Nrg1-ntfα or Nrg1-ntfβ, which could similarly activate an ErbB receptor as evidenced by increased phosphorylation of Akt and ERK, two downstream signaling molecules. Although both Nrg1-ntfα and Nrg1-ntfβ could initiate a common signaling cascade, inhibition or down-regulation of ADAM10 alone in a co-culture system did not affect normal myelination, whereas specific inhibition of BACE1 impaired normal myelination. Thus, processing of Nrg1 by BACE1 appears to be more critical for regulating myelination. Our results imply that a significant inhibition of BACE1 could potentially impair Nrg1 signaling activity in vivo." @default.
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- W2085494041 date "2011-07-01" @default.
- W2085494041 modified "2023-10-12" @default.
- W2085494041 title "Cleavage of Neuregulin-1 by BACE1 or ADAM10 Protein Produces Differential Effects on Myelination" @default.
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- W2085494041 doi "https://doi.org/10.1074/jbc.m111.251538" @default.
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