The heart of autophagy: deconstructing cardiac proteotoxicity.

The heart of autophagy: deconstructing cardiac proteotoxicity.
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DOI:
10.4161/auto.6756
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发表时间:
2008-10
期刊:
影响因子:
13.3
通讯作者:
Hill JA
Hill JA
中科院分区:
生物学1区
文献类型:
--
作者:
Rothermel BA;Hill JA

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心脏能够进行强有力的结构重塑,有时提高性能,有时导致衰竭。最近的研究发现,自噬在疾病相关的心肌细胞重塑中起着关键作用。我们以前已经表明,血流动力学负荷elevates一个适应不良的自噬反应,在心肌细胞,有助于疾病的进展。在最近的一项研究中,我们继续证明蛋白质聚集是触发自噬清除机制的近端事件。蛋白质清除的泛素-蛋白酶体依赖性途径类似地被激活,与应激诱导的蛋白质聚集体加工成侵袭体和通过自噬清除平行。在压力超负荷设置中的这些发现与在肌细胞中蛋白伴侣功能障碍的模型中发生的蛋白质聚集形成对比,其中自噬的激活是有益的,拮抗疾病进展。我们的研究结果将源于环境压力的心脏病归入蛋白质病范畴,并提出了关于引起适应性和适应不良自噬的分子事件的重要新问题。
The heart is capable of robust structural remodeling, sometimes improving performance and sometimes leading to failure. Recent studies have uncovered a critical role for autophagy in disease-related remodeling of the cardiomyocyte. We have shown previously that hemodynamic load elicits a maladaptive autophagic response in cardiomyocytes which contributes to disease progression. In a recent study, we went on to demonstrate that protein aggregation is a proximal event triggering autophagic clearance mechanisms. The ubiquitin-proteasome-dependent pathways of protein clearance are similarly activated in parallel with processing of stress-induced protein aggregates into aggresomes and clearance through autophagy. These findings in the setting of pressure overload contrast with protein aggregation occurring in a model of protein chaperone malfunction in myocytes, where activation of autophagy is beneficial, antagonizing disease progression. Our findings situate heart disease stemming from environmental stress in the category of proteinopathy and raise important new questions regarding molecular events that elicit adaptive and maladaptive autophagy.
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