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Aging-induced aberrant RAGE/PPARα axis promotes hepatic steatosis via dysfunctional mitochondrial β oxidation.
Aging Cell ( IF 8.0 ) Pub Date : 2020-09-16 , DOI: 10.1111/acel.13238
Jian Wan 1 , Xiangsong Wu 2 , Hanbei Chen 3 , Xinyi Xia 4 , Xi Song 1 , Song Chen 1 , Xinyuan Lu 1 , Jie Jin 3 , Qing Su 3 , Dongsheng Cai 5 , Bin Liu 6 , Bo Li 3
Affiliation  

Non‐alcoholic fatty liver disease (NAFLD), characterized by an increase in hepatic triglyceride (TG) content, is the most common liver disease worldwide. Aging has been shown to increase susceptibility to NAFLD; however, the underlying molecular mechanism remains poorly understood. In the present study, we examined hepatic TG content and gene expression profiles in body weight‐matched young (3 months old), middle‐aged (10 months old), and old (20 months old) C57BL/6 mice and found that TGs were markedly accumulated while mitochondrial β‐oxidation‐related genes, including PPARα, were downregulated in the liver of old mice. In addition, advanced glycation end product receptor (RAGE), a key regulator of glucose metabolism, was upregulated in the old mice. Mechanistically, suppression of RAGE upregulated PPARα and its downstream target genes, which in turn led to reduced TG retention. Finally, we found that hepatic RAGE expression was increased in aging patients, a finding that correlated with decreased PPARα levels. Taken together, our findings demonstrate that the upregulation of RAGE may play a critical role in aging‐associated liver steatosis.

中文翻译:

衰老诱导的异常 RAGE/PPARα 轴通过功能失调的线粒体 β 氧化促进肝脂肪变性。

非酒精性脂肪性肝病 (NAFLD) 以肝甘油三酯 (TG) 含量增加为特征,是全球最常见的肝脏疾病。衰老已被证明会增加对 NAFLD 的易感性;然而,潜在的分子机制仍然知之甚少。在本研究中,我们检查了体重匹配的年轻(3 个月大)、中年(10 个月大)和老年(20 个月大)C57BL/6 小鼠的肝脏 TG 含量和基因表达谱,发现 TGs线粒体β氧化相关基因(包括PPARα)在老年小鼠的肝脏中被下调。此外,晚期糖基化终产物受体(RAGE)是葡萄糖代谢的关键调节剂,在老年小鼠中上调。从机制上讲,抑制 RAGE 上调了 PPARα 及其下游靶基因,这反过来又导致 TG 保留减少。最后,我们发现老年患者的肝脏 RAGE 表达增加,这一发现与 PPARα 水平降低相关。总之,我们的研究结果表明,RAGE 的上调可能在与衰老相关的肝脂肪变性中起关键作用。
更新日期:2020-10-23
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