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- W108809021 abstract "Abstract To explore the activation patterns of signal transducer and activator of transcription 3 (Stat3) in acute myeloid leukemia (AML), we examined whether the phosphorylation of tyrosine705 (Tyr705) and serine727 (Ser727) residues was abnormally regulated in cells from patients with AML. In 5 of 20 (25%) patients with AML, Stat3 was constitutively phosphorylated on Tyr705 and Ser727, which were not further up-regulated by treatment with IL-6. Furthermore, Stat3 was constitutively bound to the IRE response element in these cells as determined by electrophoretic mobility shift assay, and stimulation with IL-6 did not result in increased DNA binding. Interestingly, AML cells with constitutive Stat3 activation also secreted high levels of IL-6 protein. Treating these AML cells with anti-IL-6 resulted in restored IL-6–inducible Stat3 phosphorylation on both Tyr705 and Ser727 with low or undetectable basal phosphorylation levels in unstimulated cells. In contrast, treatment with anti-IL-1 did not result in altered Stat3 phosphorylation patterns. The constitutive IL-6 expression was associated with elevated levels of suppressor of cytokine signaling-1 (SOCS-1) and SOCS-3 mRNA expression, which were not down-regulated by anti-IL-6. These data indicate that the constitutive Stat3 activation in the investigated AML blasts is caused by high IL-6 secretion levels, thus stimulating the Jak/Stat pathway in an autocrine manner, a paracrine manner, or both." @default.
- W108809021 created "2016-06-24" @default.
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- W108809021 date "2000-06-15" @default.
- W108809021 modified "2023-10-03" @default.
- W108809021 title "Constitutive Stat3, Tyr705, and Ser727 phosphorylation in acute myeloid leukemia cells caused by the autocrine secretion of interleukin-6" @default.
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- W108809021 doi "https://doi.org/10.1182/blood.v95.12.3765" @default.
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