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- W2079724400 abstract "Abstract Recent studies have revealed that accumulation of prion protein (PrP) in the cytoplasm results in the production of aggregates that are insoluble in non‐ionic detergents and partially resistant to proteinase K. Transgenic mice expressing PrP in the cytoplasm develop severe ataxia with cerebellar degeneration and gliosis, suggesting that cytoplasmic PrP may play a role in the pathogenesis of prion diseases. The mechanism of cytoplasmic PrP neurotoxicity is not known. In this report, we determined the molecular morphology of cytoplasmic PrP aggregates by immunofluorescence and electron microscopy, in neuronal and non‐neuronal cells. Transient expression of cytoplasmic PrP produced juxtanuclear aggregates reminiscent of aggresomes in human embryonic kidney 293 cells, human neuroblastoma BE(2)‐M17 cells and mouse neuroblastoma N2a cells. Time course studies revealed that discrete aggregates form first throughout the cytoplasm, and then coalesce to form an aggresome. Aggresomes containing cytoplasmic PrP were 1–5‐µm inclusion bodies and were filled with electron‐dense particles. Cytoplasmic PrP aggregates induced mitochondrial clustering, reorganization of intermediate filaments, prevented the secretion of wild‐type PrP molecules and diverted these molecules to the cytoplasm. Cytoplasmic PrP decreased the viability of neuronal and non‐neuronal cells. We conclude that any event leading to accumulation of PrP in the cytoplasm is likely to result in cell death." @default.
- W2079724400 created "2016-06-24" @default.
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- W2079724400 date "2006-04-28" @default.
- W2079724400 modified "2023-10-18" @default.
- W2079724400 title "Molecular morphology and toxicity of cytoplasmic prion protein aggregates in neuronal and non-neuronal cells" @default.
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- W2079724400 doi "https://doi.org/10.1111/j.1471-4159.2006.03837.x" @default.
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