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• W4377012694 abstract "Abstract Aggregation of TAR DNA-binding protein 43kDa (TDP-43) is thought to drive the pathophysiology of ALS and some Frontotemporal dementias. TDP-43 is normally a nuclear protein that in neurons translocates to the cytoplasm and forms insoluble aggregates upon activation of the integrated stress response (ISR). Viruses evolved to control the ISR. In the case of Herpesvirus 8, the protein ORF57 acts to bind protein kinase R, inhibit phosphorylation of eIF2α and reduce activation of the ISR. We hypothesized that ORF57 might also possess the ability to inhibit aggregation of TDP-43. ORF57 was expressed in the neuronal SH-SY5Y line and its effects on TDP-43 aggregation characterized. We report that ORF57 inhibits TDP-43 aggregation by 55% and elicits a 2.45-fold increase in the rate of dispersion of existing TDP-43 granules. These changes were associated with a 50% decrease in cell death. Proteomic studies were carried out to identify the protein interaction network of ORF57. We observed that ORF57 directly binds to TDP-43 as well as interacts with many components of the ISR, including elements of the proteostasis machinery known to reduce TDP-43 aggregation. We propose that viral proteins designed to inhibit a chronic ISR can be engineered to remove aggregated proteins and dampen a chronic ISR." @default.
• W4377012694 created "2023-05-19" @default.
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• W4377012694 date "2023-05-18" @default.
• W4377012694 modified "2023-10-12" @default.
• W4377012694 title "Human Herpesvirus 8 ORF57 protein is able to reduce TDP-43 pathology: Network analysis Identifies Interacting Pathways" @default.
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• W4377012694 doi "https://doi.org/10.1101/2023.05.18.540717" @default.
• W4377012694 hasPublicationYear "2023" @default.
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