The distal cytoplasmic motifs of the leukemia inhibitory factor receptor α-chain (LIFRα-CT3) and its TAT fusion protein (TAT-CT3) can independently suppress cell viability and induce myeloid differentiation in human leukemia HL-60 cells in our previous studies. But its underlying mechanism remains undefined. Herein, we show that a prokaryotic expressed TAT-CT3 induced a rapid elevation of STAT3 phosphorylation (pSTAT3), and then suppress the transcription of miR-155 and induce the elevation of SOCS-1, which further inhibited STAT3 phosphorylation for a long-term period. Our result indicated a novel mechanism of TAT-CT3 to promote HL60 cells differentiation, which provides some potential therapeutic targets for future acute myelogenous leukemia therapy.
Keywords: Acute myeloid leukemia; LIF receptor; Leukemia inhibitory factor; MicroRNA-155; Protein transduction; STAT3.
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