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• W2586574625 abstract "Tumor necrosis factor-alpha (TNF-α) exists in two forms: secretory TNF-α (sTNF-α) and transmembrane TNF-α (tmTNF-α). Although both forms of TNF-α induce tumor cell apoptosis, tmTNF-α is able to kill tumor cells that are resistant to sTNF-α-mediated cytotoxicity, indicating their differences in signal transduction. Here, we demonstrate that internalization of TNFR1 is crucial for sTNF-α- but not for tmTNF-α-induced apoptosis. sTNF-α induces binding of tumor necrosis factor receptor type 1-associated death domain protein (TRADD) to the death domain (DD) of TNFR1 and subsequent activation of nuclear factor kappa B (NF-κB), and the formation of death-inducing signaling complexes (DISCs) in the cytoplasm after internalization. In contrast, tmTNF-α induces DISC formation on the membrane in a DD-independent manner. It leads to the binding of signal transducer and activator of transcription 1 (STAT1) to a region spanning amino acids 319-337 of TNFR1 and induces phosphorylation of serine at 727 of STAT1. The phosphorylation of STAT1 promotes its binding to TRADD, and thus recruits Fas-associated protein with DD (FADD) and caspase 8 to form DISC complexes. This STAT1-dependent signaling results in apoptosis but not NF-κB activation. STAT1-deficiency in U3A cells counteracts tmTNF-α-induced DISC formation and apoptosis. Conversely, reconstitution of STAT1 expression restores tmTNF-α-induced apoptotic signaling in the cell line. Consistently, tmTNF-α suppresses the growth of STAT1-containing HT1080 tumors, but not of STAT1-deficient U3A tumors in vivo. Our data reveal an unappreciated molecular mechanism of tmTNF-α-induced apoptosis and may provide a new clue for cancer therapy." @default.
• W2586574625 created "2017-02-17" @default.
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• W2586574625 date "2017-02-10" @default.
• W2586574625 modified "2023-10-14" @default.
• W2586574625 title "STAT1 mediates transmembrane TNF-alpha-induced formation of death-inducing signaling complex and apoptotic signaling via TNFR1" @default.
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• W2586574625 doi "https://doi.org/10.1038/cdd.2016.162" @default.
• W2586574625 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/5384023" @default.
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