Cardiomyocyte VEGFR-1 activation by VEGF-B induces compensatory hypertrophy and preserves cardiac function after myocardial infarction.
Mounting evidence indicates that the function of members of the vascular endothelial growth factor (VEGF) family extends beyond blood vessel formation. Here, we show that the prolonged intramyocardial expression of VEGF-A(165) and VEGF-B(167) on adeno-associated virus-mediated gene delivery determined a marked improvement in cardiac function after myocardial infarction in rats, by promoting cardiac contractility, preserving viable cardiac tissue, and preventing remodeling of the left ventricle (LV) over time. Consistent with this functional outcome, animals treated with both factors showed diminished fibrosis and increased contractile myocardium, which were more pronounced after expression of the selective VEGF receptor-1 (VEGFR-1) ligand VEGF-B, in the absence of significant induction of angiogenesis. We found that cardiomyocytes expressed VEGFR-1, VEGFR-2, and neuropilin-1 and that, in particular, VEGFR-1 was specifically up-regulated in hypoxia and on exposure to oxidative stress. VEGF-B exerted powerful antiapoptotic effect in both cultured cardiomyocytes and after myocardial infarction in vivo. Finally, VEGFR-1 activation by VEGF-B was found to elicit a peculiar gene expression profile proper of the compensatory, hypertrophic response, consisting in activation of alphaMHC and repression of betaMHC and skeletal alpha-actin, and an increase in SERCA2a, RYR, PGC1alpha, and cardiac natriuretic peptide transcripts, both in cultured cardiomyocytes and in infarcted hearts. The finding that VEGFR-1 activation by VEGF-B prevents loss of cardiac mass and promotes maintenance of cardiac contractility over time has obvious therapeutic implications.
Zentilin
Lorena
L
Molecular Medicine Laboratory, International Centre for Genetic Engineering and Biotechnology, Trieste, Italy.
Puligadda
Uday
U
Lionetti
Vincenzo
V
Zacchigna
Serena
S
Collesi
Chiara
C
Pattarini
Lucia
L
Ruozi
Giulia
G
Camporesi
Silvia
S
Sinagra
Gianfranco
G
Pepe
Martino
M
Recchia
Fabio A
FA
Giacca
Mauro
M
D000818:Animals; D017209:Apoptosis / Q000235:genetics; D002478:Cells, Cultured; D006801:Humans; D008297:Male; D009200:Myocardial Contraction / Q000235:genetics; D009203:Myocardial Infarction / Q000235:genetics / Q000378:metabolism* / Q000473:pathology; D032383:Myocytes, Cardiac / Q000378:metabolism* / Q000473:pathology; D018919:Neovascularization, Physiologic / Q000235:genetics; D051381:Rats; D017208:Rats, Wistar; D015533:Transcriptional Activation; D042461:Vascular Endothelial Growth Factor A / Q000235:genetics / Q000378:metabolism; D042561:Vascular Endothelial Growth Factor B / Q000235:genetics / Q000378:metabolism*; D040281:Vascular Endothelial Growth Factor Receptor-1 / Q000819:agonists*; D020257:Ventricular Remodeling / Q000235:genetics
D042461:Vascular Endothelial Growth Factor A; D042561:Vascular Endothelial Growth Factor B; D040281:Vascular Endothelial Growth Factor Receptor-1