| Project/Area Number |
22790697
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| Research Category |
Grant-in-Aid for Young Scientists (B)
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| Allocation Type | Single-year Grants |
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| Research Field |
Circulatory organs internal medicine
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| Research Institution | Kanazawa University |
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Principal Investigator |
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| Project Period (FY) |
2010 – 2011
|
| Project Status |
Completed (Fiscal Year 2011)
|
| Budget Amount *help |
¥3,900,000 (Direct Cost: ¥3,000,000、Indirect Cost: ¥900,000)
Fiscal Year 2011: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000)
Fiscal Year 2010: ¥2,080,000 (Direct Cost: ¥1,600,000、Indirect Cost: ¥480,000)
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| Keywords | 心不全 / 心肥大 / シグナル伝達 / 循環器・高血圧 / タンパク品質管理機構 / 遺伝子 / 心臓リモデリング |
|---|
| Research Abstract |
Under condition of increased hemodynamic load, cardiomyocytes undergo hypertrophy to adapt to increased work load and reduce wall stress. But, the prolonged existence of cardiac hypertrophy is an independent risk factor for cardiac morbidity and mortality. Here, we investigated the role of muscle atrophy F-box(MAFbx/atrogin-1), an E3 ubiquitin ligase, in regulating cardiac hypertrophy and function in response to pressure overload. Transverse aortic constriction(TAC)-andβ.-adrenergic-induced increases in cardiac hypertrophy and lung congestion were significantly smaller in MAFbx knockout(KO) than in wild-type(WT) mice. Downregulation of MAFbx inhibits cardiac hypertrophy in part through stabilization of I. B and inactivation of nuclea factor-. B. Inhibition of MAFbx attenuates pathological hypertrophy, thereby protecting the heart from progression into heart failure.
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