Vascular endothelial growth factor prevents apoptosis and preserves contractile function in hypertrophied infant heart

被引:64
作者
Friehs, Ingeborg
Barillas, Rodrigo
Vasilyev, Nikolay V.
Roy, Nathalie
McGowan, Francis X.
del Nido, Pedro J.
机构
[1] Harvard Univ, Sch Med, Dept Cardiac Surg, Boston, MA 02115 USA
[2] Harvard Univ, Sch Med, Dept Anesthesia, Boston, MA 02115 USA
[3] Harvard Univ, Sch Med, Childrens Hosp, Dept Perioperat & Pain Med, Boston, MA USA
关键词
angiogenesis; apoptosis; hypertrophy;
D O I
10.1161/CIRCULATIONAHA.105.001289
中图分类号
R5 [内科学];
学科分类号
1002 ; 100201 ;
摘要
Background-Cardiac hypertrophy is an adaptive response to increased workload that, if unrelieved, leads to heart failure. It has been reported that cardiomyocyte apoptosis contributes to failure, and that vascular endothelial growth factor ( VEGF) treatment of hypertrophied myocardium increases capillary density and improves myocardial perfusion. In this study we hypothesized that VEGF treatment reduces cardiomyocyte apoptosis and thereby preserves myocardial contractile function. Methods and Results-Newborn rabbits underwent aortic banding. At 4 and 6 weeks of age, hypertrophied animals were treated with intrapericardial administration of recombinant VEGF protein. Three groups of animals were investigated: age-matched controls (C), untreated hypertrophied (H), and VEGF-treated hypertrophied hearts (T). Cardiomyocyte apoptosis was determined by TUNEL staining and PARP cleavage (immunoblotting of nuclear extracts) and cardiac function by transthoracic echocardiography. Death attributable to severe heart failure occurred in 14 of 43 untreated and 2 of 29 VEGF-treated animals (P < 0.01). TUNEL-positive cardiomyocyte nuclei (n/1000 nuclei) were significantly increased in untreated hearts at 5 weeks (H: 10 +/- 1.8 versus T: 3 +/- 0.7) and at 7 weeks (H: 13 +/- 3.6 versus T: 5 +/- 1.5; P < 0.05). Increased apoptosis in untreated hypertrophy was also confirmed by the presence of PARP cleavage (H: 74 +/- 7 versus T: 41 +/- 4 arbitrary densitometry units; P < 0.05). VEGF treatment preserved left ventricular mass, prevented dilation (T: 1.01 +/- 0.06 versus H: 0.77 +/- 0.07; P < 0.05), and preserved contractility indices compared with untreated hearts. Conclusions-Lack of adaptive capillary growth impairs myocardial perfusion and substrate delivery in hypertrophying myocardium. VEGF treatment reduces myocardial apoptosis and prolongs survival in a model of severe progressive left ventricular hypertrophy. Promoting capillary growth with VEGF reduces apoptosis, preserves myocardial contractile function, and delays the onset of failure in pressure-loaded infant myocardium.
引用
收藏
页码:I290 / I295
页数:6
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