Abstract
Leukemia inhibitory factor (LIF) and interleukin-6 (IL-6), two multifunctional cytokines lacking structural homology and binding to distinct receptors, share interesting functional similarities, which include induction of hematopoietic differentiation in normal and myeloid leukemia cells, induction of neuronal cell differentiation, and stimulation of acute-phase protein synthesis in hepatocytes. Structural information on the LIF receptor is not yet available, whereas recent cloning of the IL-6 receptor has shown it to be bipartite, with a signal-transducing subunit that lacks sequence homology to known protein kinases and produces second messengers of unknown nature. The molecular nature of the mechanisms which LIF and IL-6 use to induce cell differentiation is not known. To address this issue, we took advantage of a clone of M1 myeloblastic leukemia cells capable of being induced for terminal differentiation by both LIF and IL-6 directly activate the same set of immediate early response genes upon induction of M1 myeloid differentiation. At least two mechanisms of gene activation, one transcriptional and the other posttranscriptional, are shown to be involved. It is also shown that the LIF and IL-6 immediate early response, at suboptimal cytokine concentrations, is additive. Using a variety of protein kinase activators and inhibitors, we have shown that the intracellular signalling pathways for both LIF and IL-6 are distinct from those of known second messengers and involve protein phosphorylation, notably tyrosine phosphorylation of a 160-kDa protein, as an essential step(s) in the immediate early activation of MyD gene expression. These observations indicate that the functional similarities of LIF and IL-6 as inducers of cell differentiation prevail at the level of the complex differentiation immediate early response and implicate common mechanisms of signal transduction for LIF- and IL-6-induced differentiation.
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