title: Developmental relationship between hematopoietic and endothelial cells.
abstract: Blood (hematopoietic cells) and blood vessels (endothelial cells) develop from mesoderm via a transitional progenitor known as the hemangioblast. Flk-1, a receptor tyrosine kinase, and Scl, a basic helix-loop-helix transcription factor, are two critical molecules functioning in this process. Recent studies have shown that Flk-1 expressing mesoderm contributes to the circulatory system, including hematopoietic, endothelial, smooth muscle, skeletal muscle, and cardiac muscle cells. Our studies suggest that hemangioblast specification within Flk-1 expressing mesoderm is regulated by Scl expression. Herein, we review studies that have utilized transgenic mouse models as well as an in vitro model of embryonic stem cell differentiation, both of which have greatly contributed to the current understanding of the cellular and molecular pathways regulating hemangioblast development and differentiation.
authors.affiliation: Department of Pathology and Immunology, Washington University School of Medicine, St. Louis, MO 63110, USA.
authors.forename: Jesse J
authors.initials: JJ
authors.lastname: Lugus
authors.forename: Changwon
authors.initials: C
authors.lastname: Park
authors.forename: Kyunghee
authors.initials: K
authors.lastname: Choi
mesh_terms: D000818:Animals; D051792:Basic Helix-Loop-Helix Proteins / Q000235:genetics / Q000378:metabolism; D002454:Cell Differentiation; D003114:Colony-Forming Units Assay; D004730:Endothelium, Vascular / Q000166:cytology* / Q000378:metabolism; D006410:Hematopoiesis; D006412:Hematopoietic Stem Cells / Q000166:cytology* / Q000378:metabolism; D066298:In Vitro Techniques; D051379:Mice; D008822:Mice, Transgenic; D011518:Proto-Oncogene Proteins / Q000235:genetics / Q000378:metabolism; D015398:Signal Transduction; D000073942:T-Cell Acute Lymphocytic Leukemia Protein 1; D014158:Transcription, Genetic; D040301:Vascular Endothelial Growth Factor Receptor-2 / Q000235:genetics / Q000378:metabolism; D015017:Yolk Sac / Q000166:cytology
chemical_list: D051792:Basic Helix-Loop-Helix Proteins; D011518:Proto-Oncogene Proteins; D000073942:T-Cell Acute Lymphocytic Leukemia Protein 1; D040301:Vascular Endothelial Growth Factor Receptor-2; C489366:Tal1 protein, mouse