Replication stress increases mitochondrial metabolism and mitophagy in FANCD2 deficient fetal liver hematopoietic stem cells.

Replication stress increases mitochondrial metabolism and mitophagy in FANCD2 deficient fetal liver hematopoietic stem cells.
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DOI:
10.3389/fonc.2023.1108430
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发表时间:
2023
影响因子:
4.7
通讯作者:
--
中科院分区:
医学3区
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--
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范可尼贫血 (FA) 是一种遗传性骨髓 (BM) 衰竭性疾病,通常在学龄期间诊断出来。然而,在小鼠模型中,FA 基因功能受损会导致胎肝造血干细胞 (FL HSC) 数量提前下降,这与复制应激 (RS) 增加有关。最近的报告表明线粒体代谢和清除对于长期 BM HSC 功能至关重要。有趣的是,据报道 FA 细胞线粒体自噬受损。我们假设 FL HSC 中的 RS 影响线粒体代谢,以研究胎儿 FA 病理生理学。结果表明,在成年小鼠 BM HSC 中实验诱导的 RS 引起线粒体代谢和线粒体自噬显着增加。在 FANCD2 缺陷的 FL HSC 中观察到线粒体代谢和线粒体自噬增加,反映了 FA 发育过程中的生理 RS,而来自成年 FANCD2 缺陷小鼠的 BM HSC 则表现出线粒体自噬显着减少。这些数据表明 RS 激活 HSC 中的线粒体代谢和线粒体自噬。
Fanconi Anemia (FA) is an inherited bone marrow (BM) failure disorder commonly diagnosed during school age. However, in murine models, disrupted function of FA genes leads to a much earlier decline in fetal liver hematopoietic stem cell (FL HSC) number that is associated with increased replication stress (RS). Recent reports have shown mitochondrial metabolism and clearance are essential for long-term BM HSC function. Intriguingly, impaired mitophagy has been reported in FA cells. We hypothesized that RS in FL HSC impacts mitochondrial metabolism to investigate fetal FA pathophysiology. Results show that experimentally induced RS in adult murine BM HSCs evoked a significant increase in mitochondrial metabolism and mitophagy. Reflecting the physiological RS during development in FA, increase mitochondria metabolism and mitophagy were observed in FANCD2-deficient FL HSCs, whereas BM HSCs from adult FANCD2-deficient mice exhibited a significant decrease in mitophagy. These data suggest that RS activates mitochondrial metabolism and mitophagy in HSC.
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