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• W2080969984 abstract "Autophagy plays an important role in targeting cellular proteins, protein aggregates and organelles for degradation for cell survival. Autophagy dysfunction has been extensively described in neurodegenerative conditions linked to protein misfolding and aggregation. However, the role of autophagy in the prion disease process is unclear. Here, we show that when expressed in mouse neuroblastoma N2a cells, cytoplasmic PrP (cyPrP) aggregates lead to endoplasmic reticulum stress (ER stress), activation of reticulon 3 (RTN3), impairment of ubiquitin-proteasome system (UPS), induction of autophagy and apoptosis. RTN3 belongs to the reticulon family with the highest expression in the brain and RTN3 is often activated under ER stress. To assess the function of RTN3 in pathological conditions involving cyPrP protein misfolding, we knocked down the expression of RTN3 in cyPrP-transfected cells; unexpectedly, the inhibition of expression of RTN3 enhances the induction of autophagy resulted from cyPrP aggregates, and the process is mediated by the enhanced interaction between Bcl-2 and Beclin1 promoted by RTN3, which enhances Bcl-2-mediated inhibition of Beclin 1-dependent autophagy. Furthermore, down-regulation of RTN3 promoted the clearance of cyPrP aggregates, allowed the activity of the UPS to resume and alleviated ER stress; ultimately, apoptosis due to the cyPrP aggregates was inhibited. Together, these data suggest that RTN3 negatively regulates autophagy to block the clearance of cyPrP aggregates and provide a clue regarding the potential to induce autophagy for the treatment of prion disease and other neurodegenerative diseases such as Parkinson disease (PD), Alzheimer disease (AD) and Huntington disease (HD)." @default.
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• W2080969984 date "2011-02-01" @default.
• W2080969984 modified "2023-10-16" @default.
• W2080969984 title "Reticulon 3 attenuates the clearance of cytosolic prion aggregates via inhibiting autophagy" @default.
• W2080969984 doi "https://doi.org/10.4161/auto.7.2.14197" @default.
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