Normal patterning of the coronary capillary plexus is dependent on the correct transmural gradient of FGF expression in the myocardium

被引:23
作者
Pennisi, DJ [1 ]
Mikawa, T [1 ]
机构
[1] Cornell Univ, Coll Med, Dept Cell & Dev Biol, New York, NY 10021 USA
关键词
transmural patterning; fibroblast growth factor; avian embryo; heart development; coronary vasculature; epicardium; myocardium;
D O I
10.1016/j.ydbio.2004.12.028
中图分类号
Q [生物科学];
学科分类号
07 ; 0710 ; 09 ;
摘要
The formation of the coronary vessel system is vital for heart development, an essential step of which is the establishment of a capillary plexus that displays a density gradient across the myocardial wall, being higher on the epicardial than the endocardial side. This gradient in capillary plexus formation develops concurrently with transmural gradients of myocardium-derived growth factors, including FGFs. To test the role of the FGF expression gradient in patterning the nascent capillary plexus, an ectopic FGF-over-expressing site was created in the ventricular myocardial wall in the quail embryo via retroviral infection from E2-2.5, thus abolishing the transmural gradient of FGFs. In FGF virus-infected regions of the ventricular myocardium, the capillary density across the transmural axis shifted away from that in control hearts at E7. This FGF-induced change in vessel patterning was more profound at E12, with the middle zone becoming the most vascularized. An up-regulation of FGFR-1 and VEGFR-2 in epicardial and subepicardial cells adjacent to FGF virus-infected myocardium was also detected, indicating a paracrine effect on induction of vascular signaling components in coronary precursors. These results suggest that correct transmural patterning of coronary vessels requires the correct transmural expression of FGF and, therefore, FGF may act as a template for coronary vessel patterning. (C) 2005 Elsevier Inc. All rights reserved.
引用
收藏
页码:378 / 390
页数:13
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