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• W1964230890 abstract "Measles virus plays an important role as an environmental factor in the pathogenesis of Paget's disease (PD). Previous studies have shown that IL-6 is increased in the bone marrow of Paget's patients and that measles virus nucleocapsid protein (MVNP) induces IL-6 secretion by pagetic osteoclasts. Further, IL-6 plays a critical role in the development of pagetic osteoclasts and bone lesions induced by PD, but the mechanisms regulating IL-6 production by MVNP remain unclear. Our current studies revealed that MVNP expression in osteoclast precursors down-regulated Sirt1 mRNA and protein, a negative regulator of NF-κB activity, which is a key factor for IL-6 expression. MVNP expression in NIH3T3 cells also elevated Il-6 transcription and impaired the expression of Sirt1 mRNA both under basal conditions and upon activation of the Sirt1 upstream regulator FoxO3 by LY294002 (a PI3K/AKT inhibitor). Luciferase activity assays showed that constitutively active FoxO3 abolished the repressive effect of MVNP on reporters driven by either FoxO3 response elements or the Sirt1 promoter. Further, protein stability assays revealed that FoxO3 was degraded more rapidly in MVNP-expressing cells than in control cells following the addition of cycloheximide. Similarly, co-transfection of MVNP and FoxO3 into HEK293 cells demonstrated that MVNP decreased the protein levels of over-expressed FoxO3 in a dose-dependent manner. Treatment with the proteasome inhibitor, MG132, blocked the MVNP-triggered decrease of FoxO3, and the treatment with the serine/threonine phosphatase inhibitor, calyculin A, revealed that MVNP increased phosphorylation of FoxO3. Further, over-expression of Sirt1 or treatment with the Sirt1 activator resveratrol blocked the increase in Il-6 transcription by MVNP. Finally, resveratrol reduced the numbers of TRAP positive multi-nuclear cells in bone marrow cultures from TRAP-MVNP transgenic mice to wild type levels. These results indicate that MVNP decreases FoxO3/Sirt1 signaling to enhance the levels of IL-6, which in part mediate MVNP's contribution to the development of Paget's disease." @default.
• W1964230890 created "2016-06-24" @default.
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• W1964230890 date "2013-03-01" @default.
• W1964230890 modified "2023-10-18" @default.
• W1964230890 title "Measles virus nucleocapsid protein, a key contributor to Paget's disease, increases IL-6 expression via down-regulation of FoxO3/Sirt1 signaling" @default.
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• W1964230890 doi "https://doi.org/10.1016/j.bone.2012.12.007" @default.
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