| First Author | Li J | Year | 2011 |
| Journal | Cardiovasc Res | Volume | 90 |
| Issue | 2 | Pages | 315-24 |
| PubMed ID | 21245055 | Mgi Jnum | J:186006 |
| Mgi Id | MGI:5430723 | Doi | 10.1093/cvr/cvr010 |
| Citation | Li J, et al. (2011) Up-regulation of p27(kip1) contributes to Nrf2-mediated protection against angiotensin II-induced cardiac hypertrophy. Cardiovasc Res 90(2):315-24 |
| abstractText | AIMS: Nuclear factor erythroid-2-related factor 2 (Nrf2) appears to be a negative regulator of maladaptive cardiac remodelling and dysfunction; however, a potential of the Nrf2-mediated cardiac protection in diverse pathological settings remains to be determined. This study was aimed to explore the role of Nrf2 in angiotensin II (Ang II)-induced cardiac hypertrophy. METHODS AND RESULTS: Littermate wild-type (WT) and Nrf2 knockout (Nrf2(-/-)) mice were administered Ang II via osmotic mini-pumps for 2 weeks to induce cardiac hypertrophy. Elevation of blood pressure by the continuous Ang II infusion was comparable between WT and Nrf2(-/-) mice. Relative to WT mice, however, Nrf2(-/-) mice exhibited exaggerated myocardial oxidative stress with an impaired induction of a group of antioxidant genes and increased cardiac hypertrophy in response to the sustained Ang II stimulation. In cultured cardiomyocytes, adenoviral overexpression of Nrf2 shRNA enhanced Ang II-induced reactive oxygen species (ROS) production and protein synthesis, whereas adenoviral overexpression of Nrf2 exerted opposite effects. Moreover, Nrf2 deficiency exacerbated Ang II-induced down-regulation of p27(kip1) expression in the heart via a mechanism of post-transcriptional regulation. In contrast, adenoviral overexpression of Nrf2 increased p27(kip1) protein but not mRNA expression and reversed Ang II-induced down-regulation of p27(kip1) protein expression in cultured cardiomyocytes by suppressing ROS formation. Finally, the enhancement of Ang II-induced hypertrophic growth due to the Nrf2 deficiency was negated by overexpressing p27(kip1) in cultured cardiomyocytes. CONCLUSION: The Nrf2-p27(kip1) pathway serves as a novel negative feedback mechanism in Ang II-induced pathogenesis of cardiac hypertrophy, independent of changes in blood pressure. |
