High-mobility group box 1 is dispensable for autophagy, mitochondrial quality control, and organ function in vivo.

High-mobility group box 1 is dispensable for autophagy, mitochondrial quality control, and organ function in vivo.
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DOI:
10.1016/j.cmet.2014.01.014
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发表时间:
2014-03-04
期刊:
影响因子:
29
通讯作者:
Schwabe RF
Schwabe RF
中科院分区:
生物学1区
文献类型:
--
作者:
Huebener P;Gwak GY;Pradere JP;Quinzii CM;Friedman R;Lin CS;Trent CM;Mederacke I;Zhao E;Dapito DH;Lin Y;Goldberg IJ;Czaja MJ;Schwabe RF

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体外研究表明,高迁移率组盒1 (HMGB1)在自噬和功能失调线粒体的自噬清除中起关键作用,导致HMGB1缺陷细胞严重的线粒体断裂和线粒体呼吸严重紊乱。在这里,我们研究了HMGB1缺乏对体内自噬和线粒体功能的影响,在肝脏和心脏使用条件HMGB1消融。出乎意料的是,在肝细胞或心肌细胞这两种线粒体丰富的细胞类型中,Hmgb1的缺失并未改变线粒体结构或功能、器官功能或长期生存。此外,在Hmgb1缺失的情况下,肝脏自噬和有丝自噬正常发生,Hmgb1缺失对基线和糖皮质激素诱导的肝脏基因表达没有显著影响。综上所述,我们的研究结果表明,HMGB1在成年生物的自噬、线粒体质量控制、基因表达调控和器官功能中是不可或缺的。
In vitro studies have demonstrated a critical role for high mobility group box 1 (HMGB1) in autophagy and the autophagic clearance of dysfunctional mitochondria, resulting in severe mitochondrial fragmentation and profound disturbances of mitochondrial respiration in HMGB1-deficient cells. Here, we investigated the effects of HMGB1 deficiency on autophagy and mitochondrial function in vivo, using conditional Hmgb1 ablation in the liver and heart. Unexpectedly, deletion of Hmgb1 in hepatocytes or cardiomyocytes, two cell types with abundant mitochondria, did not alter mitochondrial structure or function, organ function or long-term survival. Moreover, hepatic autophagy and mitophagy occurred normally in the absence of Hmgb1, and absence of Hmgb1 did not significantly affect baseline and glucocorticoid-induced hepatic gene expression. Collectively, our findings suggest that HMGB1 is dispensable for autophagy, mitochondrial quality control, the regulation of gene expression and organ function in the adult organism.
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