AGING CELL:活性氧诱导衰老肝脏中的胆固醇积累

2019-01-05 海北 MedSci原创

老龄化是许多慢性病的主要危险因素,因为衰老个体对外部压力的易感性增加,并且易患疾病。已有的研究也显示,衰老与代谢性肝病,如非酒精性脂肪肝,有关。

老龄化是许多慢性病的主要危险因素,因为衰老个体对外部压力的易感性增加,并且易患疾病。已有的研究也显示,衰老与代谢性肝病,如非酒精性脂肪肝,有关。

最近,研究人员探究了小鼠衰老过程中脂质代谢的变化及其相关机制。老年小鼠肝组织中脂质积累增加,尤其是胆固醇。与年轻小鼠相比,在老年小鼠的肝细胞中观察到胆固醇和葡萄糖的摄取增加。在衰老过程中,用于胆固醇合成的GLUT2GKSREBP2HMGCRHMGCSmRNA表达在肝组织中逐渐增加。

活性氧(ROS)随着衰老而增加,并且与各种和衰老有关的疾病密切相关。当研究人员用ROS诱导剂H2O2处理HepG2细胞和原代肝细胞时,与未处理的HepG2细胞相比,脂质积累显着增加。 H2O2处理显着增加葡萄糖摄取和乙酰辅酶A产生,这导致糖酵解和脂质合成的发生。用H2O2处理显着增加了与胆固醇合成和摄取相关的基因的mRNA表达。

这些结果表明,ROS在改变胆固醇代谢中起重要作用,因此在衰老过程中加剧肝脏中胆固醇的积累。


原始出处:

Eunhui Seo et al. Reactive oxygen species‐induced changes in glucose and lipid metabolism contribute to the accumulation of cholesterol in the liver during aging. AGING CELL, 2018; doi: https://doi.org/10.1111/acel.12895


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    2019-06-12 维他命
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    2019-01-07 徐岩
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    2019-01-05 王秀

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