RGD Reference Report - Contribution of nitric oxide to the pathogenesis of cirrhotic cardiomyopathy in bile duct-ligated rats. - Rat Genome Database

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Contribution of nitric oxide to the pathogenesis of cirrhotic cardiomyopathy in bile duct-ligated rats.

Authors: Liu, H  Ma, Z  Lee, SS 
Citation: Liu H, etal., Gastroenterology. 2000 May;118(5):937-44.
RGD ID: 2325265
Pubmed: PMID:10784593   (View Abstract at PubMed)

BACKGROUND & AIMS: Decreased cardiac contractility and beta-adrenergic responsiveness have been observed in cirrhosis, but the etiology remains unclear. We aimed to test the role of nitric oxide (NO), a negative inotropic agent, in the pathogenesis of cirrhotic cardiomyopathy in a rat model. METHODS: Cirrhosis was induced by bile duct ligation. Four weeks after ligation or sham operation, cardiac levels of tumor necrosis factor (TNF)-alpha, guanosine 3,5'-cyclic monophosphate (cGMP), inducible NOS (NOS2), and endothelial constitutive NOS (NOS3) messenger RNA (mRNA) and protein were determined. Serum nitrite/nitrate level was measured. Cardiac contractile function was evaluated in isolated left ventricular papillary muscles in the absence and presence of the NOS inhibitor nitro-L-arginine methyl ester (L-NAME). RESULTS: Cardiac TNF-alpha, NOS2 mRNA and protein, cGMP, and serum interleukin (IL)-1beta and nitrite/nitrate levels were significantly higher in cirrhotic rats than sham controls. No significant differences in NOS3 mRNA or protein were found between cirrhotic and sham control rats. Baseline isoproterenol-stimulated papillary muscle contractile force was significantly lower in the cirrhotic group; with L-NAME incubation, contractile force increased significantly in cirrhotic rats but was unaffected in the controls. In normal papillary muscles, IL-1beta attenuated the contractility, but coincubation with L-NAME again reversed this attenuation. Incubation with the exogenous NO donor S-nitroso-N-acetyl-penicillamine also blunted papillary muscle contractility. CONCLUSIONS: These results suggest that cytokine-induced stimulation of NOS2 plays a significant role in the pathogenesis of cirrhotic cardiomyopathy.



RGD Manual Disease Annotations    Click to see Annotation Detail View

  
Object SymbolSpeciesTermQualifierEvidenceWithNotesSourceOriginal Reference(s)
NOS2HumanExperimental Liver Cirrhosis  ISONos2 (Rattus norvegicus)mRNA:increased expression:heartRGD 
Nos2RatExperimental Liver Cirrhosis  IEP mRNA:increased expression:heartRGD 
Nos2MouseExperimental Liver Cirrhosis  ISONos2 (Rattus norvegicus)mRNA:increased expression:heartRGD 

Objects Annotated

Genes (Rattus norvegicus)
Nos2  (nitric oxide synthase 2)

Genes (Mus musculus)
Nos2  (nitric oxide synthase 2, inducible)

Genes (Homo sapiens)
NOS2  (nitric oxide synthase 2)


Additional Information