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Title Lack of sik1 in mouse embryonic stem cells impairs cardiomyogenesis by down-regulating the cyclin-dependent kinase inhibitor p57kip2

Authors Antonio Romito, Enza Lonardo, Guglielmo Roma, Gabriella Minchiotti, Andrea Ballabio, Gilda Cobellis
Date 2010-02-03

Publisher PloS One
DOI 10.1371/journal.pone.0009029
Tag Animals, Blotting, Western, Cell Cycle, Cell Differentiation, Cell Line, Cell Proliferation, Cells, Cultured, Cyclin-Dependent Kinase Inhibitor p57, Down-Regulation, Embryonic Stem Cells, Flow Cytometry, Gene Expression Profiling, Humans, Mice, Mice, Knockout, Myocytes, Cardiac, Neurons, Oligonucleotide Array Sequence Analysis, Protein-Serine-Threonine Kinases, Reverse Transcriptase Polymerase Chain Reaction, Time Factors

Sik1 (salt inducible kinase 1) is a serine/threonine kinase that belongs to the stress- and energy-sensing AMP-activated protein kinase family. During murine embryogenesis, sik1 marks the monolayer of future myocardial cells that will populate first the primitive ventricle, and later the primitive atrium suggesting its involvement in cardiac cell differentiation and/or heart development. Despite that observation, the involvement of sik1 in cardiac differentiation is still unknown. We examined the sik1 function during cardiomyocyte differentiation using the ES-derived embryoid bodies. We produced a null embryonic stem cell using a gene-trap cell line carrying an insertion in the sik1 locus. In absence of the sik1 protein, the temporal appearance of cardiomyocytes is delayed. Expression profile analysis revealed sik1 as part of a genetic network that controls the cell cycle, where the cyclin-dependent kinase inhibitor p57(Kip2) is directly involved. Collectively, we provided evidence that sik1-mediated effects are specific for cardiomyogenesis regulating cardiomyoblast cell cycle exit toward terminal differentiation.

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