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MiR-24 Is Required for Hematopoietic Differentiation of Mouse Embryonic Stem Cells


Studies of mouse embryos and embryonic stem cells (ESCs) have defined the ontogeny of mammalian embryonic hematopoietic cells. The ESC differentiation system has been valuable for dissecting the molecular regulation of the development of mesoderm into HPCs. Extracellular signals regulate a complex network of transcription factors to direct embryonic hematopoietic development. Mammalian miRNAs have previously not been described to regulate this genetic network during embryonic hematopoiesis. However, a role for miRNAs in producing the hemangioblast, and hemogenic endothelium in Xenopus has been described. Our work with ESCs demonstrates a specific requirement for the miRNA, miR-24, in the development of hematopoietic progenitors cells (HPCs). Antagonizing miR-24 in ESCs does not affect generation of BL-CFCs, the in vitro equivalent of the hemangioblast, but does compromise the ability of those BL-CFCs to produced HPCs. Expression of transcription factors required for HPC production downstream of the hemangioblast, Scl, and Runx1, is greatly reduced by antagonizing miR-24. These results identify miR-24, as a mammalian miRNA required for the development of blood from newly formed mesoderm.


Vyšlo v časopise: MiR-24 Is Required for Hematopoietic Differentiation of Mouse Embryonic Stem Cells. PLoS Genet 11(1): e32767. doi:10.1371/journal.pgen.1004959
Kategorie: Research Article
prolekare.web.journal.doi_sk: https://doi.org/10.1371/journal.pgen.1004959

Souhrn

Studies of mouse embryos and embryonic stem cells (ESCs) have defined the ontogeny of mammalian embryonic hematopoietic cells. The ESC differentiation system has been valuable for dissecting the molecular regulation of the development of mesoderm into HPCs. Extracellular signals regulate a complex network of transcription factors to direct embryonic hematopoietic development. Mammalian miRNAs have previously not been described to regulate this genetic network during embryonic hematopoiesis. However, a role for miRNAs in producing the hemangioblast, and hemogenic endothelium in Xenopus has been described. Our work with ESCs demonstrates a specific requirement for the miRNA, miR-24, in the development of hematopoietic progenitors cells (HPCs). Antagonizing miR-24 in ESCs does not affect generation of BL-CFCs, the in vitro equivalent of the hemangioblast, but does compromise the ability of those BL-CFCs to produced HPCs. Expression of transcription factors required for HPC production downstream of the hemangioblast, Scl, and Runx1, is greatly reduced by antagonizing miR-24. These results identify miR-24, as a mammalian miRNA required for the development of blood from newly formed mesoderm.


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