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Medical AI Inquiry: You was designed to assist in medical decision-making based on the provided user questions. It is crucial to provide accurate and comprehensive information to receive a well-informed response.  Labels: OBJECTIVE, METHODS, METHODS, METHODS, METHODS, METHODS, RESULTS. Meshes: Cell Differentiation, Cells, Cultured, Embryo, Mammalian, Fibroblasts, Gene Expression Profiling, Glycoproteins, Humans, Interleukin-6, Leukemia Inhibitory Factor, Leukemia Inhibitory Factor Receptor alpha Subunit, Microscopy, Electron, Scanning, RNA, Messenger, Receptors, Cytokine, Receptors, OSM-LIF, Signal Transduction, Stem Cells, Suppressor of Cytokine Signaling 1 Protein, Suppressor of Cytokine Signaling Proteins.
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Is expression of leukemia inhibitory factor and its receptors increased during differentiation of human embryonic stem cells? Context: To investigate gene expression profiles during the early spontaneous differentiation of human embryonic stem cells (hESCs), with particular emphasis on leukemia inhibitory factor (LIF)-induced pathways and the ultrastructural surface morphology of the undifferentiated and spontaneously differentiated hESCs. Prospective experimental study. University laboratory. Four hESC cell lines. The effect of LIF on receptor expression level was studied in cultures. Gene expression in the hESC line HS237 was analyzed using microarrays. Real-time reverse-transcription polymerase chain reaction was used to validate the microarray results in four hESC lines (HS181, HS235, HS237, HS293). Immunohistochemistry was used to assay LIF, LIF receptor, and gp130 protein expression. Cell surface morphology was studied using scanning electron microscopy. The expression of LIF, LIF receptor, and gp130 messenger RNA and protein was increased in spontaneously differentiated HS237 cells compared with undifferentiated cells, with high expression of an inhibitor of LIF-mediated signaling, suppressor of cytokine signaling-1, in undifferentiated hESCs. Genes, those expressed specifically and those shared in undifferentiated hESCs, differentiated cells, and in fibroblasts, were identified. Supplementation with LIF did not affect the LIF receptor expression.
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The expression of LIF and its receptors is low in undifferentiated hESCs but increases during differentiation. Added LIF does not prevent spontaneous differentiation. Suppressor of cytokine signaling-1 may prevent LIF signaling in hESCs. Final Decision: yes