Sie können Bookmarks mittels Listen verwalten, loggen Sie sich dafür bitte in Ihr SLUB Benutzerkonto ein.
Medientyp:
E-Artikel
Titel:
Differential Notch Signaling in the Epicardium Is Required for Cardiac Inflow Development and Coronary Vessel Morphogenesis
Beteiligte:
del Monte, Gonzalo;
Casanova, Jesús C.;
Guadix, Juan Antonio;
MacGrogan, Donal;
Burch, John B.E.;
Pérez-Pomares, José María;
de la Pompa, José Luis
Erschienen in:
Circulation Research, 108 (2011) 7, Seite 824-836
Sprache:
Englisch
DOI:
10.1161/circresaha.110.229062
ISSN:
0009-7330;
1524-4571
Entstehung:
Anmerkungen:
Beschreibung:
Rationale: The proepicardium is a transient structure comprising epicardial progenitor cells located at the posterior limit of the embryonic cardiac inflow. A network of signals regulates proepicardial cell fate and defines myocardial and nonmyocardial domains at the venous pole of the heart. During cardiac development, epicardial-derived cells also contribute to coronary vessel morphogenesis. Objective: To study Notch function during proepicardium development and coronary vessel formation in the mouse. Methods and Results: Using in situ hybridization, RT-PCR, and immunohistochemistry, we find that Notch pathway elements are differentially activated throughout the proepicardial–epicardial–coronary transition. Analysis of RBPJk -targeted embryos indicates that Notch ablation causes ectopic procardiogenic signaling in the proepicardium that in turn promotes myocardial differentiation in adjacent mesodermal progenitors, resulting in a premature muscularization of the sinus venosus horns. Epicardium-specific Notch1 ablation using a Wt1-Cre driver line disrupts coronary artery differentiation, reduces myocardium wall thickness and myocyte proliferation, and reduces Raldh2 expression. Ectopic Notch1 activation disrupts epicardium development and causes thinning of ventricular walls. Conclusions: Epicardial Notch modulates cell differentiation in the proepicardium and adjacent pericardial mesoderm. Notch1 is later required for arterial endothelium commitment and differentiation and for vessel wall maturation during coronary vessel development and myocardium growth.