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• W2893940400 abstract "Abstract Iron homeostasis is critical to mammals, and dysregulation in iron homeostasis usually leads to severe disorders including various cancers. Massive hepcidin secretion is an indicator of thyroid cancer, but the molecular mechanisms responsible for this dysregulation are unknown. Hepcidin secretion from thyroid cancer cells also leads to decreased expression of the iron exporter, ferroportin (FPN), and increased intracellular iron retention, which promote cancer proliferation. In this study, we examined the role of hepcidin in thyroid cancer (TC) and the molecular bases of its signaling. Synthesis of hepcidin is regulated by the BMP4/7 agonist SOSTDC1, which was downregulated in TC; SOSTDC1 downregulation was correlated with G9a-mediated hypermethylation in its promoter. The binding of G9a to the SOSTDC1 promoter requires E4BP4, which interacts with G9a to form a multi-molecular complex that contributes to SOSTDC1 silencing. Silencing of E4BP4 or G9a has similar effects to SOSTDC1 overexpression, which suppresses secretion of hepcidin and inhibits TC cell proliferation. Furthermore, our in vivo xenograft data indicated that depletion of E4BP4 also inhibits cancer growth, reduces hepcidin secretion, and reduces G9a nuclear transportation. Iron homeostasis and tumor growth in TC may be regulated by an E4BP4-dependent epigenetic mechanism. These findings suggest a new mechanism of cellular iron dysfunction through the E4BP4/G9a/SOSTDC1/hepcidin pathway, which is an essential link in TC." @default.
• W2893940400 created "2018-10-05" @default.
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• W2893940400 date "2018-09-24" @default.
• W2893940400 modified "2023-10-10" @default.
• W2893940400 title "E4BP4 promotes thyroid cancer proliferation by modulating iron homeostasis through repression of hepcidin" @default.
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• W2893940400 doi "https://doi.org/10.1038/s41419-018-1001-3" @default.
• W2893940400 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/6155336" @default.
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• W2893940400 hasPublicationYear "2018" @default.
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