Role of Mesodermal FGF8 and FGF10 Overlaps in the Development of the Arterial Pole of the Heart and Pharyngeal Arch Arteries

• Published in: Circulation research 2010-02, Vol.106 (3), p.495-503
• Main Authors: Watanabe, Yusuke, Miyagawa-Tomita, Sachiko, Vincent, Stéphane D, Kelly, Robert G, Moon, Anne M, Buckingham, Margaret E
• Format: Article
• Language: English
• Subjects: Animal genetics; Animals; Biochemistry, Molecular Biology; Biological and medical sciences; Branchial Region - abnormalities; Branchial Region - blood supply; Branchial Region - embryology; Crosses, Genetic; Development Biology; Embryology and Organogenesis; Fetal Heart - growth & development; Fibroblast Growth Factor 10 - biosynthesis; Fibroblast Growth Factor 10 - deficiency; Fibroblast Growth Factor 10 - genetics; Fibroblast Growth Factor 10 - physiology; Fibroblast Growth Factor 8 - biosynthesis; Fibroblast Growth Factor 8 - deficiency; Fibroblast Growth Factor 8 - genetics; Fibroblast Growth Factor 8 - physiology; Fundamental and applied biological sciences. Psychology; Gene Deletion; Gene Dosage; Genetics; Genotype; Heart Defects, Congenital - embryology; Heart Defects, Congenital - genetics; Heart Defects, Congenital - pathology; Heart Ventricles - abnormalities; Heart Ventricles - embryology; Life Sciences; Mesoderm - embryology; Mesoderm - metabolism; Mice; Mice, Mutant Strains; Molecular biology; Ventricular Outflow Obstruction - embryology; Ventricular Outflow Obstruction - genetics; Vertebrates: cardiovascular system
• ISSN: 0009-7330; 1524-4571
• DOI: 10.1161/CIRCRESAHA.109.201665

RATIONALE:The genes encoding fibroblast growth factor (FGF) 8 and 10 are expressed in the anterior part of the second heart field that constitutes a population of cardiac progenitor cells contributing to the arterial pole of the heart. Previous studies of hypomorphic and conditional Fgf8 mutants show disrupted outflow tract (OFT) and right ventricle (RV) development, whereas Fgf10 mutants do not have detectable OFT defects. OBJECTIVES:Our aim was to investigate functional overlap between Fgf8 and Fgf10 during formation of the arterial pole. METHODS AND RESULTS:We generated mesodermal Fgf8; Fgf10 compound mutants with MesP1Cre. The OFT/RV morphology in these mutants was affected with variable penetrance; however, the incidence of embryos with severely affected OFT/RV morphology was significantly increased in response to decreasing Fgf8 and Fgf10 gene dosage. Fgf8 expression in the pharyngeal arch ectoderm is important for development of the pharyngeal arch arteries and their derivatives. We now show that Fgf8 deletion in the mesoderm alone leads to pharyngeal arch artery phenotypes and that these vascular phenotypes are exacerbated by loss of Fgf10 function in the mesodermal core of the arches. CONCLUSIONS:These results show functional overlap of FGF8 and FGF10 signaling from second heart field mesoderm during development of the OFT/RV, and from pharyngeal arch mesoderm during pharyngeal arch artery formation, highlighting the sensitivity of these key aspects of cardiovascular development to FGF dosage.