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• W3198900738 abstract "Abstract Protein disulphide isomerase (PDI) is a chaperone that catalyses the formation of thiol-disulphide bonds during protein folding. Whilst up-regulation of PDI is a protective mechanism to regulate protein folding, an increasingly wide range of cellular functions have been ascribed to PDI. Originally identified in the endoplasmic reticulum (ER), PDI has now been detected in many cellular locations, including the nucleus. However, its role in this cellular compartment remains undefined. PDI is implicated in multiple diseases, including amyotrophic lateral sclerosis (ALS), a fatal and rapidly progressing neurodegenerative condition affecting motor neurons. Loss of essential proteins from the nucleus is an important feature of ALS. This includes TAR DNA-binding protein-43 (TDP-43), a DNA/RNA binding protein present in a pathological form in the cytoplasm in almost all (97%) ALS cases, that is also mutated in a proportion of familial cases. PDI is protective against disease-relevant phenotypes associated with dysregulation of protein homeostasis (proteostasis) in ALS. DNA damage is also increasingly linked to ALS, which is induced by pathological forms of TDP-43 by impairment of its normal function in the non-homologous end-joining (NHEJ) mechanism of DNA repair. However, it remains unclear whether PDI is protective against DNA damage in ALS. In this study we demonstrate that PDI was protective against several types of DNA damage, induced by either etoposide, hydrogen peroxide (H2O2), or ALS-associated mutant TDP-43 M337V in neuronal cells. This was demonstrated using widely used DNA damage markers, phosphorylated H2AX and 53BP1, which is specific for NHEJ. Moreover, we also show that PDI translocates into the nucleus following DNA damage. Here PDI is recruited directly to sites of DNA damage, implying that it has a direct role in DNA repair. This study therefore identifies a novel role of PDI in the nucleus in preventing DNA damage." @default.
• W3198900738 created "2021-09-13" @default.
• W3198900738 creator A5012669113 @default.
• W3198900738 creator A5056287391 @default.
• W3198900738 creator A5082897073 @default.
• W3198900738 creator A5083132001 @default.
• W3198900738 creator A5086977561 @default.
• W3198900738 date "2021-09-01" @default.
• W3198900738 modified "2023-09-26" @default.
• W3198900738 title "Protein disulphide isomerase (PDI) is protective against several types of DNA damage, including that induced by amyotrophic lateral sclerosis-associated mutant TDP-43 in neuronal cells/ in vitro models" @default.
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• W3198900738 doi "https://doi.org/10.1101/2021.08.31.458441" @default.
• W3198900738 hasPublicationYear "2021" @default.
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