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• W2115418322 abstract "Nuclear dots containing PML and Sp100 proteins (NDs) play a role in the development of acute promyelocytic leukemia, are modified after infection with various viruses, and are autoimmunogenic in patients with primary biliary cirrhosis (PBC). PML and Sp100 gene expression is strongly enhanced by interferons (IFN). Based on immunostaining with a monoclonal antibody (mAb C8A2), a third protein, nuclear dot protein 52 (NDP52), was recently localized in NDs. Here we analyzed the cellular localization, expression, and structure of NDP52 in more detail. Our NDP52-specific sera revealed mainly cytoplasmic staining but no ND pattern, neither in untreated nor in IFN-treated cells. Cells transfected with NDP52 expression vectors showed exclusively cytoplasmic staining. In subcellular fractionation experiments, NDP52 was found in cytoplasmic and nuclear fractions. Unlike as described for Sp100 and PML, NDP52 mRNA and protein levels were only marginally enhanced by IFN γ and not enhanced at all by IFN β. NDP52 homodimerization but no heterodimerization with Sp100 or PML could be demonstrated. None of the 93 PBC sera tested contained autoantibodies against NDP52. Finally, mAb C8A2 reacted not only with NDP52 but also with a conformation-dependent epitope on the Sp100 protein. These data imply that NDP52 forms homodimers but no heterodimers with Sp100 and PML, lacks autoantigenicity in PBC, localizes mainly in the cytoplasm, and is associated with the nucleus, but not with NDs. Finally, unlike Sp100 and PML, NDP52 expression is neither markedly enhanced nor localization detectably altered by type I and II IFNs." @default.
• W2115418322 created "2016-06-24" @default.
• W2115418322 creator A5016621878 @default.
• W2115418322 creator A5045645905 @default.
• W2115418322 creator A5051235946 @default.
• W2115418322 creator A5057204197 @default.
• W2115418322 date "1997-07-28" @default.
• W2115418322 modified "2023-10-18" @default.
• W2115418322 title "Cellular Localization, Expression, and Structure of the Nuclear Dot Protein 52" @default.
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• W2115418322 doi "https://doi.org/10.1083/jcb.138.2.435" @default.
• W2115418322 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/2138200" @default.
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• W2115418322 hasPublicationYear "1997" @default.
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