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TXNIP maintains the hematopoietic cell pool by switching the function of p53 under oxidative stress

机译:TXNIP通过在氧化应激下切换p53的功能来维持造血细胞池

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摘要

Reactive oxygen species (ROS) are critical determinants of the fate of hematopoietic stem cells (HSCs) and hematopoiesis. Thioredoxin-interacting protein (TXNIP), which is induced by oxidative stress, is a known regulator of intracellular ROS. Txnip-/- old mice exhibited elevated ROS levels in hematopoietic cells and showed a reduction in hematopoietic cell population. Loss of TXNIP led to a dramatic reduction of mouse survival under oxidative stress. TXNIP directly regulated p53 protein by interfering with p53- mouse double minute 2 (MDM2) interactions and increasing p53 transcriptional activity. Txnip-/- mice showed downregulation of the antioxidant genes induced by p53. Introduction of TXNIP or p53 into Txnip-/- bone marrow cells rescued the HSC frequency and greatly increased survival in mice following oxidative stress. Overall, these data indicate that TXNIP is a regulator of p53 and plays a pivotal role in the maintenance of the hematopoietic cells by regulating intracellular ROS during oxidative stress.
机译:活性氧(ROS)是造血干细胞(HSC)和造血功能命运的关键决定因素。氧化应激诱导的硫氧还蛋白相互作用蛋白(TXNIP)是细胞内ROS的已知调节剂。 Txnip-/-老小鼠在造血细胞中表现出升高的ROS水平,并且显示出造血细胞数量减少。 TXNIP的丧失导致小鼠在氧化应激下的存活率急剧下降。 TXNIP通过干扰p53-小鼠双分2(MDM2)相互作用和增加p53转录活性来直接调节p53蛋白。 Txnip-/-小鼠显示出p53诱导的抗氧化基因的下调。在Txnip-/-骨髓细胞中引入TXNIP或p53可以挽救HSC频率,并大大提高氧化应激后小鼠的存活率。总体而言,这些数据表明TXNIP是p53的调节剂,并且在氧化应激过程中通过调节细胞内ROS在维持造血细胞中起关键作用。

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