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Nephrol Dial Transplant (2001) 16: 18-21
© 2001 European Renal Association-European Dialysis and Transplant Association

The loop diuretic torasemide interferes with endothelin-1 actions in the aorta of hypertensive rats

Ana Fortuño, Paula Muñiz, Guillermo Zalba, M. Antonia Fortuño and Javier Díez

Division of Cardiovascular Pathophysiology, School of Medicine, University of Navarra, Pamplona, Spain

Background. The direct effects of torasemide and furosemide on vasoconstriction and increases in intracellular free calcium concentration ([Ca2+]i) induced by endothelin-1 (ET-1) were investigated in the aorta of spontaneously hypertensive rats (SHR).

Methods. Vascular responses were assessed in endothelium-denuded aortic rings using an organ bath system. Changes of [Ca2+]i in cultured vascular smooth muscle cells (VSMCs) were assessed using fura-2 methodology.

Results. ET-1-induced vasoconstriction was reduced in a dose-dependent way by torasemide and furosemide (IC50 values: 4.3±1.4x10-5 and 9.8±5.6 x10-5 M, respectively). The ET-1-induced biphasic [Ca2+]i increase was blocked by torasemide (IC50=2.0±0.2x10-8 and 2.7±0.6x10-6 M, respectively). Furosemide inhibited the initial rise in [Ca2+]i induced by ET-1, with no effect on the second rise. The specific chloride (Cl-) channel blocker diphenylamine-2-carboxylate inhibits both ET-1-induced responses in VSMCs (IC50=8.0±0.3x10-9 and 2.5±0.7x10-7 M, respectively).

Conclusions. These results suggest that the ability of loop diuretics to interfere with the vascular actions of ET-1 may involve different molecular mechanisms. The ability of torasemide to block the vasoconstrictive action of ET-1 could include an inhibitory action on Cl- channels.

Keywords: endothelin-1; furosemide; hypertension; torasemide

Correspondence and offprint requests to: Javier Díez, MD, PhD, División de Fisiopatología Cardiovascular, Facultad de Medicina, C/Irunlarrea s/n, 31008 Pamplona, Spain.


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