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Am J Physiol Heart Circ Physiol 280: H885-H891, 2001;
0363-6135/01 $5.00
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Vol. 280, Issue 2, H885-H891, February 2001

Upregulation of angiotensin-converting enzyme by vascular endothelial growth factor

Outi Saijonmaa1,2, Tuulikki Nyman1, Riikka Kosonen1, and Frej Fyhrquist1,2

1 Minerva Institute for Medical Research and 2 Department of Internal Medicine, Helsinki University Central Hospital, SF-00250 Helsinki, Finland

The role of vascular endothelial growth factor (VEGF), a potent endothelium-specific angiogenic factor, in the regulation of angiotensin-converting enzyme (ACE) in cultured human umbilical vein endothelial cells (HUVECs) was studied. VEGF (0.07-1.2 × 10-6 mmol/l) caused a dose-dependent increase in ACE measured in intact endothelial cells and increased the expression of ACE mRNA. The stimulatory effect of VEGF was inhibited by pretreatment of endothelial cells with the tyrosine kinase inhibitor herbimycin (4.35 × 10-5 mmol/l). The stimulatory effect of VEGF was potentiated by the selective cGMP phosphodiesterase inhibitor zaprinast (0.1 mmol/l). The nitric oxide synthase inhibitor Nomega -nitro-L-arginine methyl ester (L-NAME; 5.4 mmol/l) suppressed the stimulatory effect of VEGF. The nonselective cyclooxygenase (COX) inhibitor indomethacin (5 µM) and the selective COX-2 inhibitor NS-398 (5 µM) potentiated the stimulatory effect of VEGF, whereas the selective COX-1 inhibitor resveratrol (5 µM) was without effect. ACE induction by VEGF was inhibited by the selective protein kinase C (PKC) inhibitor GF109203X (2.5 × 10-3 mmol/l) and by downregulating PKC with phorbol 12-myristate 13-acetate. In summary, VEGF induced ACE in cultured HUVECs. Intracellular events such as tyrosine kinase activation, PKC activation, and increase of cGMP were probably involved in ACE induction by VEGF. Nitric oxide may partially contribute to ACE induction by VEGF. The powerful capacity of VEGF to increase ACE in endothelial cells shown here suggests a synergistic relation between VEGF and the renin-angiotensin system in vascular biology and pathophysiology.

human umbilical vein endothelial cells; regulation; signal transduction


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