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- W2159556212 abstract "Amyloid-β (Aβ) peptide-induced neurotoxicity is typically associated with cell death through mechanisms not entirely understood. Here, we investigated stress signaling events triggered by soluble Aβ in differentiated rat neuronal-like PC12 cells. Morphologic evaluation of apoptosis confirmed that Aβ induced nuclear fragmentation that was prevented by pre-treatment with the antiapoptotic bile acid tauroursodeoxycholic acid (TUDCA). In addition, Aβ exposure triggered an early signaling response by the endoplasmic reticulum (ER) and caspase-12-mediated apoptosis, which, however, was independent of the ER-stress pathway. Furthermore, ER stress markers, including GRP94, ATF-6α, CHOP, and eIF2α, were strongly downregulated by Aβ, independent of protein degradation, and partially restored by TUDCA. Calpain inhibition prevented caspase-12 activation and reduced levels of ATF-6α. Importantly, Aβ-induced GRP94 downregulation was related to protein secretion and partially rescued through inhibition of the secretory pathway by geldanamycin and brefeldin. In conclusion, we showed that the ER is a proximal stress sensor for soluble Aβ-induced toxicity, resulting in caspase-12 activation and cell death in PC12 neuronal cells. Moreover, ER chaperone GRP94 secretion was associated with Aβ-induced apoptotic signaling. These data provide new information linking apoptotic properties of Aβ peptide to distinct subcellular mechanisms of toxicity. Further characterization of this signaling pathway is likely to provide new perspectives for modulation of amyloid-induced apoptosis." @default.
- W2159556212 created "2016-06-24" @default.
- W2159556212 creator A5069186777 @default.
- W2159556212 creator A5074043200 @default.
- W2159556212 creator A5091512253 @default.
- W2159556212 date "2011-10-28" @default.
- W2159556212 modified "2023-10-12" @default.
- W2159556212 title "Amyloid-β Peptide-Induced Secretion of Endoplasmic Reticulum Chaperone Glycoprotein GRP94" @default.
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- W2159556212 doi "https://doi.org/10.3233/jad-2011-100395" @default.
- W2159556212 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/21750376" @default.
- W2159556212 hasPublicationYear "2011" @default.
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