Temporally Expressed PDGF and FGF-2 Regulate Embryonic Coronary Artery Formation and Growth

Overview

Journal Arterioscler Thromb Vasc Biol

Date 2008 Apr 19

PMID 18420995

Citations 17

Authors

Robert J Tomanek

Heidi K Hansen

Lance P Christensen

Affiliations

Soon will be listed here.

Abstract

Objective: PDGF and FGF-2 are important regulators of vascular wall assembly. We tested the hypothesis that their embryonic temporal expression facilitates 2 specific events: (1) the endothelial invasion of the aortic root to form the coronary artery stems and (2) the subsequent growth and development of the arterial tree.

Methods And Results: Addition of FGF-2 and PDGF-BB proteins to embryonic quail heart explants stimulated a 3- and 7-fold increase, respectively, in tubulogenesis, whereas neutralizing antibodies to these growth factors attenuated tubulogenesis by 40%. Anti-FGF-2 and anti-PDGF neutralizing antibodies were then introduced in ovo via the vitelline vein at various embryonic (E) days. When injections occurred before coronary ostial formation, the embryos usually developed only 1 coronary artery or lacked coronary arteries. When 1 or both major coronary arteries formed: (1) their branches had a thinner tunica media, and (2) smooth muscle investment did not progress as far distally as in shams. Other anomalies included smaller diameter coronary artery stems in some hearts. Inhibition of VEGF via injections of aflibercept (VEGF-Trap, a VEGFR-1 and -2 chimera), previously shown to be essential for coronary stem formation, limited development of the coronary arteries even though introduced after formation of coronary ostia (at E9 or EI0).

Conclusions: Our data (1) document a role for FGF-2 and PDGF in the temporal regulation of coronary artery stem formation and growth of the coronary arterial tree and (2) reveal that VEGF expression is required for normal artery/arterial formation, even after coronary artery stem formation.

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