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JOURNAL ARTICLE
RESEARCH SUPPORT, NON-U.S. GOV'T
A selective switch-on system for self-renewal of embryonic stem cells using chimeric cytokine receptors.
Biochemical and Biophysical Research Communications 1998 July 10
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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