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  • Title: A selective switch-on system for self-renewal of embryonic stem cells using chimeric cytokine receptors.
    Author: Nakamura T, Arai T, Takagi M, Sawada T, Matsuda T, Yokota T, Heike T.
    Journal: Biochem Biophys Res Commun; 1998 Jul 09; 248(1):22-7. PubMed ID: 9675079.
    Abstract:
    Propagation of embryonic stem (ES) cells with an undifferentiated pluripotential phenotype depends on leukemia inhibitory factor (LIF). The LIF receptor complex is composed of a heterodimer of LIF receptor alpha (LIFR alpha) and gp130. To activate LIFR signaling pathways independently from endogenous ones, we constructed chimeric receptors by linking the extracellular domain of human granulocyte-macrophage colony-stimulating factor (GM-CSF) receptor alpha or beta (hGMR alpha or beta) to the transmembrane and cytoplasmic regions of either mouse LIFR alpha or gp130. hGMR alpha-mLIFR/hGMR beta-mgp130 or hGMR alpha-mgp130/hGMR beta-mgp130, but not hGMR alpha-mLIFR/hGMR beta-mLIFR, preserved the self-renewal activity in A3 ES cells. All of these chimeric receptors were phosphorylated after hGM-CSF stimulation without phosphorylation of endogenous gp130. Phosphorylation of the signal transducer and activator of transcription 3 through chimeric receptors correlated with the undifferentiated phenotype. Therefore, these chimeric receptors prove useful to analyze mechanisms of the self-renewal of ES cells.
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