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Role of NO in the pulmonary artery hyporeactivity to phenylephrine in experimental biliary cirrhosis

F Chabot, H Mestiri, S Sabry, J Dall'Ava-Santucci, A Lockhart, AT Dinh-Xuan
European Respiratory Journal 1996 9: 560-564; DOI: 10.1183/09031936.96.09030560
F Chabot
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H Mestiri
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S Sabry
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J Dall'Ava-Santucci
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A Lockhart
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AT Dinh-Xuan
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Abstract

The aim of this study was to see whether increased activity of nitric oxide (NO) might account for decreased pulmonary vascular tone seen in the hyperdynamic circulation of cirrhosis. We compared the pulmonary vascular reactivity of isolated pulmonary arteries (PA) from control rats (n = 10), and rats with biliary cirrhosis (n = 10) induced by chronic bile duct ligation (4 weeks). The responses of PA rings to cumulative concentrations of phenylephrine, acetylcholine, and sodium nitroprusside were studied, and also the effects of inhibition of synthesis of NO by the L-arginine analogue, N omega-nitro-L-arginine (L-NOARG) in PA rings challenged with cumulative concentrations of phenylephrine and acetylcholine. The contractile response to phenylephrine was significantly reduced in cirrhotic PA rings as compared with controls. Pretreatment with L-NOARG (10(-4) M) significantly increased the contractile response to phenylephrine in PA rings from cirrhotic rats but not in control PA rings. Furthermore, L-NOARG restored the response to phenylephrine in cirrhotic PA rings back to normal. There was no difference in the relaxation of PA rings from both groups in response to acetylcholine and sodium nitroprusside. We conclude that in vitro pulmonary artery ring hyporeactivity to phenylephrine results from increased nitric oxide production in the pulmonary circulation of cirrhotic rats and might account for the hepatopulmonary syndrome.

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Role of NO in the pulmonary artery hyporeactivity to phenylephrine in experimental biliary cirrhosis
F Chabot, H Mestiri, S Sabry, J Dall'Ava-Santucci, A Lockhart, AT Dinh-Xuan
European Respiratory Journal Mar 1996, 9 (3) 560-564; DOI: 10.1183/09031936.96.09030560

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Role of NO in the pulmonary artery hyporeactivity to phenylephrine in experimental biliary cirrhosis
F Chabot, H Mestiri, S Sabry, J Dall'Ava-Santucci, A Lockhart, AT Dinh-Xuan
European Respiratory Journal Mar 1996, 9 (3) 560-564; DOI: 10.1183/09031936.96.09030560
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