Impaired endothelial nitric oxide synthase activity associated with enhanced caveolin binding in experimental cirrhosis in the rat

V. Shah, M. Toruner, F. Haddad, G. Cadelina, Andreas Papapetropoulos, K. Choo, W. C. Sessa, R. J. Groszmann

Research output: Contribution to journalArticle

258 Citations (Scopus)

Abstract

Background and Aims: A reduction in nitric oxide (NO) has been implicated as a cause of intrahepatic vasoconstriction in cirrhosis, but the regulatory mechanisms remain undefined. The aim of this study was to examine a contributory role for caveolin-1, a putative negative regulator of endothelial NO synthase, in mediating deficient intrahepatic NO production in the intact cirrhotic liver. Methods: Cirrhosis was induced by carbon tetrachloride inhalation. Flow regulation of NO production and perfusion pressure was examined in the perfused rat liver. Protein expression of endothelial NO synthase (eNOS), caveolin, and calmodulin was examined by Western blotting and immunohistochemistry. NOS activity and NO production were assessed by citrulline generation and chemiluminescence, respectively. Protein-protein interactions were examined using whole tissue protein immunoprecipitation. Results: In response to incremental increases in flow, cirrhotic animals produced significantly less NO(x) than control animals. NOS activity was significantly reduced in liver tissue from cirrhotic animals compared with control animals in the presence of similar eNOS protein levels. Deficient eNOS activity was associated with a several-fold increase in binding of eNOS with caveolin. Protein levels of caveolin-1 were markedly increased in the cirrhotic liver. Conclusions: These studies provide evidence that enhanced expression and interaction of caveolin with eNOS contribute to impaired NO production, reduced NOS activity, and vasoconstriction in the intact cirrhotic liver.

Original languageEnglish (US)
Pages (from-to)1222-1228
Number of pages7
JournalGastroenterology
Volume117
Issue number5
DOIs
StatePublished - Jan 1 1999
Externally publishedYes

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Caveolins
Nitric Oxide Synthase Type III
Nitric Oxide
Fibrosis
Nitric Oxide Synthase
Liver
Caveolin 1
Proteins
Vasoconstriction
Citrulline
Carbon Tetrachloride
Calmodulin
Luminescence
Immunoprecipitation
Inhalation
Perfusion
Western Blotting
Immunohistochemistry
Pressure

ASJC Scopus subject areas

  • Hepatology
  • Gastroenterology

Cite this

Impaired endothelial nitric oxide synthase activity associated with enhanced caveolin binding in experimental cirrhosis in the rat. / Shah, V.; Toruner, M.; Haddad, F.; Cadelina, G.; Papapetropoulos, Andreas; Choo, K.; Sessa, W. C.; Groszmann, R. J.

In: Gastroenterology, Vol. 117, No. 5, 01.01.1999, p. 1222-1228.

Research output: Contribution to journalArticle

Shah, V. ; Toruner, M. ; Haddad, F. ; Cadelina, G. ; Papapetropoulos, Andreas ; Choo, K. ; Sessa, W. C. ; Groszmann, R. J. / Impaired endothelial nitric oxide synthase activity associated with enhanced caveolin binding in experimental cirrhosis in the rat. In: Gastroenterology. 1999 ; Vol. 117, No. 5. pp. 1222-1228.
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AU - Choo, K.

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