RGD Reference Report - Impaired endothelial nitric oxide synthase activity associated with enhanced caveolin binding in experimental cirrhosis in the rat. - Rat Genome Database

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

Authors: Shah, V  Toruner, M  Haddad, F  Cadelina, G  Papapetropoulos, A  Choo, K  Sessa, WC  Groszmann, RJ 
Citation: Shah V, etal., Gastroenterology. 1999 Nov;117(5):1222-8.
RGD ID: 7775034
Pubmed: PMID:10535886   (View Abstract at PubMed)

BACKGROUND & 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 severalfold 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.

RGD Manual Disease Annotations    Click to see Annotation Detail View
TermQualifierEvidenceWithReferenceNotesSourceOriginal Reference(s)
liver cirrhosis  ISONos3 (Rattus norvegicus)7775034; 7775034protein:decreased activity:liver (rat)RGD 
liver cirrhosis  IEP 7775034protein:decreased activity:liver (rat)RGD 

Objects Annotated

Genes (Rattus norvegicus)
Nos3  (nitric oxide synthase 3)

Genes (Mus musculus)
Nos3  (nitric oxide synthase 3, endothelial cell)

Genes (Homo sapiens)
NOS3  (nitric oxide synthase 3)


Additional Information