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Am J Physiol Heart Circ Physiol 283: H2371-H2378, 2002. First published August 22, 2002; doi:10.1152/ajpheart.00383.2002
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Vol. 283, Issue 6, H2371-H2378, December 2002

Deficiency in endothelial nitric oxide synthase impairs myocardial angiogenesis

Xue Zhao, Xiangru Lu, and Qingping Feng

Cardiology Research Laboratory, Lawson Health Research Institute, London Health Sciences Centre, Departments of Medicine, Physiology, and Pharmacology, University of Western Ontario, London, Ontario, Canada N6A 4G5

We recently demonstrated that mice deficient in endothelial nitric oxide (NO) synthase (eNOS) have congenital septal defects and postnatal heart failure. However, the mechanisms by which eNOS affects heart development are not clear. We hypothesized that deficiency in eNOS impairs myocardial angiogenesis. Myocardial capillary densities were measured morphometrically in neonatal mouse hearts. In vitro tube formation on Matrigel was investigated in cardiac endothelial cells. In vivo myocardial angiogenesis was performed by implanting Matrigel in the left ventricular myocardium. Myocardial capillary densities and VEGF mRNA expression were decreased in neonatal eNOS-/- compared with neonatal wild-type mice (P < 0.01). Furthermore, in vitro tube formation from cardiac endothelial cells and in vivo myocardial angiogenesis were attenuated in eNOS-/- compared with wild-type mice (P < 0.01). In vitro tube formation was inhibited by NG-nitro-L-arginine methyl ester in wild-type mice and restored by a NO donor, diethylenetriamine-NO, in eNOS-/- mice (P < 0.05). In conclusion, deficiency in eNOS decreases VEGF expression and impairs myocardial angiogenesis and capillary development. Decreased myocardial angiogenesis may contribute to cardiac abnormalities during heart development in eNOS-/- mice.

heart; endothelial cells; vascular endothelial growth factor; knockout mice; capillary development


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