(Hypertension. 1997;30:29-34.)
© 1997 American Heart Association, Inc.
Articles |
From the Department of Medicine, Division of Cardiology, Emory University School of Medicine (S.R., J.B.L., A.B., S.K., D.G.H.), Atlanta, Ga; the Atlanta (Ga) Veterans Administration Medical Center (D.G.H.); Department of Pathology, McGill University, Montreal, Canada (J.B.L., A.G.); Rigshospital, Copenhagen, Denmark (J.B.L.); and Parke-Davis Pharmaceutical Research, Ann Arbor, Mich (J.K., S.H.).
Correspondence to David G. Harrison, MD, Division of Cardiology, Emory University School of Medicine, 1639 Pierce Dr, WMB-319, Atlanta, GA 30322.
Abstract Experiments in cultured vascular smooth muscle cells have shown that angiotensin II (Ang II) stimulates expression of endothelin-1. We sought to examine role of endothelin-1 in the effects of Ang II in vivo. Ang II infusion in rats (0.7 mg/kg per day for 5 days) was associated with marked increases in vascular smooth muscle endothelin-1 levels, as assessed by immunostaining. Administration of the selective endothelin type A (ETA) receptor antagonist PD 155080 (50 mg/kg per day) abrogated the hypertensive response to a 5-day infusion of Ang II (0.7 mg/kg per day), as did losartan (25 mg/kg per day). ETA receptor blockade during Ang IImediated hypertension was associated with marked elevations of plasma endothelin-1 levels. Ang IImediated hypertension was associated with heightened vascular responsiveness to a variety of vasoconstrictor agents except endothelin-1. Blockade of ETA receptor invariably corrected this vasoconstrictor hyperresponsiveness. We conclude that some of the vascular effects of Ang II thought to be unique to this hormone are likely mediated by endothelin-1.
Key Words: angiotensin II endothelin receptors, endothelin
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