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首页> 外文期刊>Cell metabolism >High-Mobility Group Box 1 Is Dispensable for Autophagy, Mitochondria! Quality Control,and Organ Function In Vivo
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High-Mobility Group Box 1 Is Dispensable for Autophagy, Mitochondria! Quality Control,and Organ Function In Vivo

机译:高移动性分组盒1可用于自噬,线粒体!体内质量控制和器官功能

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摘要

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 mitochondria! 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.
机译:体外研究表明,高迁移率族1(HMGB1)在自噬和功能障碍线粒体的自噬清除中起关键作用,导致严重的线粒体破碎和严重的线粒体紊乱!缺乏HMGB1的细胞呼吸。在这里,我们使用肝脏和心脏中的条件性Hmgb1消融研究了HMGB1缺乏对体内自噬和线粒体功能的影响。出乎意料的是,肝细胞或心肌细胞中Hmgb1的缺失是两种具有丰富线粒体的细胞类型,并未改变线粒体的结构或功能,器官功能或长期存活率。此外,在没有Hmgb1的情况下正常发生肝自噬和线粒体吞噬,而Hmgb1的缺乏对基线和糖皮质激素诱导的肝基因表达没有明显影响。总的来说,我们的发现表明HMGB1对于成体生物体的自噬,线粒体质量控制,基因表达的调节和器官功能都是必不可少的。

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