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• W2105289127 abstract "Endothelin (ET) 1 is a potent vasoconstrictor peptide produced by vascular endothelial cells and implicated in various pathophysiologic states involving abnormal vascular tone. Homozygous ET-1 null mice have craniofacial and cardiac malformations that lead to neonatal death. To study the role of ET-1 in adult vascular physiology, we generated a mouse strain (ET-1(flox/flox);Tie2-Cre mice) in which ET-1 is disrupted specifically in endothelial cells. ET-1 peptide levels in plasma, heart, lung, kidney, and brain homogenates were reduced by 65% to 80% in these mice. mRNA levels for ET receptors were unaltered except that the ET(A) receptor mRNA was upregulated in the heart. ET-1(flox/flox);Tie2-Cre mice had mean blood pressures 10 to 12 mm Hg lower than genetic controls. In contrast, the blood pressure of mice systemically heterozygous for the ET-1 null allele (ET-1(dlox/+) mice) was unchanged compared with wild-type littermates. Despite the lower basal blood pressure, acute pharmacological responses to angiotensin II, captopril, phenylephrine, bradykinin, N(G)-nitro-L-arginine methyl ester, and exogenous ET-1 were normal in ET-1(flox/flox);Tie2-Cre mice. These results support an essential role of endothelial-derived ET-1 in the maintenance of basal vascular tone and blood pressure. Normal pharmacological responses of ET-1(flox/flox);Tie2-Cre mice suggest that the renin-angiotensin system, the adrenergic system, and NO are not significantly altered by endothelial ET-1. Taken in conjunction with other lines of genetically altered mice, our results provide evidence for a paracrine vasoregulatory pathway mediated by endothelial cell-derived ET-1 acting on the vascular smooth muscle ET(A) receptor." @default.
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• W2105289127 date "2010-07-01" @default.
• W2105289127 modified "2023-09-30" @default.
• W2105289127 title "Low Blood Pressure in Endothelial Cell–Specific Endothelin 1 Knockout Mice" @default.
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• W2105289127 doi "https://doi.org/10.1161/hypertensionaha.109.138701" @default.
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