RGD Reference Report - Complementary inhibition of cerebral aneurysm formation by eNOS and nNOS. - Rat Genome Database
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Complementary inhibition of cerebral aneurysm formation by eNOS and nNOS.

Authors: Aoki, T  Nishimura, M  Kataoka, H  Ishibashi, R  Nozaki, K  Miyamoto, S 
Citation: Aoki T, etal., Lab Invest. 2011 Apr;91(4):619-26. Epub 2011 Feb 14.
RGD ID: 5131897
Pubmed: (View Article at PubMed) PMID:21321533
DOI: Full-text: DOI:10.1038/labinvest.2010.204

The rupture of cerebral aneurysm (CA) and subsequent subarachnoid hemorrhage can cause fatal results. Recent experimental findings have suggested that the mechanism of CA formation is based on chronic inflammation in arterial walls by hemodynamic force. Endothelial nitric oxide synthase (eNOS) protects arterial walls from vascular inflammation by relieving hemodynamic force through nitric oxide (NO) production. Thus, the expression and protective role of eNOS in CA formation have been investigated in this study. In this study, experimental induced rodent CA models by carotid ligation and systemic hypertension were used. The expression of eNOS was examined in rat CA models and revealed that it was decreased at the site of CA formation. Next, CA was induced in eNOS(-/-) mice to clarify the role of eNOS in CA formation. In eNOS(-/-) mice, the incidence of CA formation was similar to that found in wild-type mice. In CA walls of eNOS(-/-) mice, the expression of neuronal nitric oxide synthase (nNOS) was upregulated compared with that in wild-type mice, suggesting the compensatory effect of nNOS. Hence, eNOS(-/-) nNOS(-/-) mice were generated, underwent CA induction and confirmed that eNOS(-/-) nNOS(-/-) mice exhibited an increased incidence of CA formation accompanied by accelerated macrophage infiltration. These results suggested that the deficiency of eNOS could be compensated by nNOS upregulation in cerebral arteries and that the eNOS and nNOS complementarily had the protective role in CA formation. The results of this study will provide us with new insight about the mechanisms of CA formation and the functional redundancy between eNOS and nNOS in cerebral arteries.


Disease Annotations    
intracranial aneurysm  (IEP,IMP,ISO)

Objects Annotated

Genes (Rattus norvegicus)
Nos1  (nitric oxide synthase 1)
Nos3  (nitric oxide synthase 3)

Genes (Mus musculus)
Nos1  (nitric oxide synthase 1, neuronal)
Nos3  (nitric oxide synthase 3, endothelial cell)

Genes (Homo sapiens)
NOS1  (nitric oxide synthase 1)
NOS3  (nitric oxide synthase 3)

Additional Information