Increased aortic cyclic guanosine monophosphate concentration in experimental cirrhosis in rats: Evidence for a role of nitric oxide in the pathogenesis of arterial vasodilation in cirrhosis

作者：Michel Niederberger, Pere Ginès, Phoebe Tsai, Pierre‐Yves Martin, Kenneth G. Morris, André Luiz Loureiro Weigert, Ivan F. McMurtry, Robert W. Schrier · 发表于：Hepatology · 年份：1995 · DOI：10.1002/hep.1840210622 · 被引用次数：77 · 研究领域：Liver Disease and Transplantation、Nitric Oxide and Endothelin Effects、Cardiovascular, Neuropeptides, and Oxidative Stress Research

Arterial vasodilation is considered to be the key factor in the development of sodium and water retention leading to ascites formation in cirrhosis. To determine if nitric oxide (NO) is involved in the pathogenesis of arterial vasodilation in cirrhosis, we measured the concentration of cyclic guanosine monophosphate (cGMP), the second messenger of NO, in arterial tissue from rats with carbon tetrachloride-induced cirrhosis. Aortic cGMP concentration was markedly increased in cirrhotic rats, particularly in those with ascites (ascites, 826 +/- 70; no ascites, 597 +/- 48; controls, 331 +/- 25 fmol/mg, ANOVA F = 23.1, P < .0001), and correlated inversely with arterial pressure (r = -.56, P < .0001) and systemic vascular resistance (r = -.69, P = .014) and directly with cardiac index (r = .74, P < .01). The chronic administration of the NO synthesis inhibitor NG-nitro-L-arginine-methyl-ester (L-NAME) (10 mg/kg/day for 7 days) induced a marked reduction in aortic cGMP concentration in cirrhotic rats with ascites to similar values obtained in L-NAME-treated control rats (86 +/- 14 vs. 89 +/- 8 fmol/mg, respectively, NS), indicating that the high-aortic cGMP content in cirrhotic rats was caused by an increased NO synthesis. Mean arterial pressure after L-NAME treatment increased to similar values in both groups of animals. These results suggest that in cirrhosis there is an increased vascular production of NO that may play a role in the pathogenesis of arterial vasodilation.