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• W1992988894 abstract "Amyloid fibril formation is associated with diseases such as Alzheimer's, Parkinson's, and prion diseases. Inhibition of amyloid fibril formation by molecular chaperone proteins, such as the small heat-shock protein αB-crystallin, may play a protective role in preventing the toxicity associated with this form of protein misfolding. Reduced and carboxymethylated κ-casein (RCMκ-CN), a protein derived from milk, readily and reproducibly forms fibrils at physiological temperature and pH. We investigated the toxicity of fibril formation by RCMκ-CN using neuronal model PC12 cells and determined whether the inhibition of fibril formation altered its cell toxicity. To resolve ambiguities in the literature, we also investigated whether fibril formation by amyloid-β1-40 (Aβ(1-40)), the peptide associated with Alzheimer's disease, was inhibited by αB-crystallin and if this affected the toxicity of Aβ. To this end, either RCMκ-CN or Aβ(1-40) was incubated at neutral pH to induce fibril formation before treating PC12 cells and assessing cell viability. Incubated (fibrillar) RCMκ-CN was more toxic to PC12 cells than native RCMκ-CN with the highest level of toxicity being associated with mature fibrils and protofibrils. Furthermore, the toxicity of RCMκ-CN was attenuated when its fibril formation was inhibited, either through the chaperone action of αB-crystallin or when it interacted with its natural binding partners in milk, α(S)- and β-casein. Likewise, incubating Aβ(1-40) with αB-crystallin inhibited both Aβ(1-40) fibril formation and the associated cell toxicity. Importantly, by inhibiting fibril formation, αB-crystallin prevents the cell toxicity associated with protein misfolding." @default.
• W1992988894 created "2016-06-24" @default.
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• W1992988894 creator A5078609974 @default.
• W1992988894 creator A5083304343 @default.
• W1992988894 date "2010-07-15" @default.
• W1992988894 modified "2023-10-16" @default.
• W1992988894 title "αB-Crystallin inhibits the cell toxicity associated with amyloid fibril formation by κ-casein and the amyloid-β peptide" @default.
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• W1992988894 doi "https://doi.org/10.1007/s12192-010-0212-z" @default.
• W1992988894 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/3024074" @default.
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