title: BMP receptor IA is required in mammalian neural crest cells for development of the cardiac outflow tract and ventricular myocardium.
abstract: The neural crest is a multipotent, migratory cell population arising from the border of the neural and surface ectoderm. In mouse, the initial migratory neural crest cells occur at the five-somite stage. Bone morphogenetic proteins (BMPs), particularly BMP2 and BMP4, have been implicated as regulators of neural crest cell induction, maintenance, migration, differentiation and survival. Mouse has three known BMP2/4 type I receptors, of which Bmpr1a is expressed in the neural tube sufficiently early to be involved in neural crest development from the outset; however, earlier roles in other domains obscure its requirement in the neural crest. We have ablated Bmpr1a specifically in the neural crest, beginning at the five-somite stage. We find that most aspects of neural crest development occur normally; suggesting that BMPRIA is unnecessary for many aspects of early neural crest biology. However, mutant embryos display a shortened cardiac outflow tract with defective septation, a process known to require neural crest cells and to be essential for perinatal viability. Surprisingly, these embryos die in mid-gestation from acute heart failure, with reduced proliferation of ventricular myocardium. The myocardial defect may involve reduced BMP signaling in a novel, minor population of neural crest derivatives in the epicardium, a known source of ventricular myocardial proliferation signals. These results demonstrate that BMP2/4 signaling in mammalian neural crest derivatives is essential for outflow tract development and may regulate a crucial proliferation signal for the ventricular myocardium.
authors.affiliation: Department of Cell Biology, Duke University Medical Center, Durham, NC 27710, USA.
authors.forename: Rolf W
authors.initials: RW
authors.lastname: Stottmann
authors.forename: Murim
authors.initials: M
authors.lastname: Choi
authors.forename: Yuji
authors.initials: Y
authors.lastname: Mishina
authors.forename: Erik N
authors.initials: EN
authors.lastname: Meyers
authors.forename: John
authors.initials: J
authors.lastname: Klingensmith
mesh_terms: D000818:Animals; D055396:Bone Morphogenetic Protein 2; D055415:Bone Morphogenetic Protein 4; D052005:Bone Morphogenetic Protein Receptors, Type I; D019485:Bone Morphogenetic Proteins / Q000378:metabolism; D002319:Cardiovascular System / Q000033:anatomy & histology; D002454:Cell Differentiation; D004622:Embryo, Mammalian / Q000033:anatomy & histology / Q000502:physiology*; D018507:Gene Expression Regulation, Developmental; D005865:Gestational Age; D006330:Heart Defects, Congenital; D006352:Heart Ventricles / Q000033:anatomy & histology / Q000254:growth & development*; D051379:Mice; D018345:Mice, Knockout; D009024:Morphogenesis / Q000502:physiology*; D009206:Myocardium / Q000166:cytology / Q000378:metabolism*; D009432:Neural Crest / Q000166:cytology* / Q000378:metabolism; D010496:Pericardium / Q000166:cytology / Q000378:metabolism; D017346:Protein Serine-Threonine Kinases / Q000235:genetics / Q000378:metabolism*; D011518:Proto-Oncogene Proteins / Q000378:metabolism; D017978:Receptors, Growth Factor / Q000235:genetics / Q000378:metabolism*; D015398:Signal Transduction / Q000502:physiology; D019170:Somites / Q000166:cytology / Q000378:metabolism; D016212:Transforming Growth Factor beta; D051153:Wnt Proteins; D029961:Zebrafish Proteins
chemical_list: C525719:Bmp2 protein, mouse; C525810:Bmp4 protein, mouse; D055396:Bone Morphogenetic Protein 2; D055415:Bone Morphogenetic Protein 4; D019485:Bone Morphogenetic Proteins; D011518:Proto-Oncogene Proteins; D017978:Receptors, Growth Factor; D016212:Transforming Growth Factor beta; D051153:Wnt Proteins; D029961:Zebrafish Proteins; C525813:bmp4 protein, zebrafish; D017346:Protein Serine-Threonine Kinases; C498212:Bmpr1a protein, mouse; D052005:Bone Morphogenetic Protein Receptors, Type I