通过恢复铁硫集群生物生成来挽救Frataxin损失
Tslil Ast1, Joshua D Meisel1, Shachin Patra2
1Broad Institute, Cambridge, MA 02142, USA; Howard Hughes Medical Institute, Howard Hughes Medical Institute, Massachusetts General Hospital, Boston, MA 02114, USA; Department of Molecular Biology, Massachusetts General Hospital, Boston, MA 02114, USA; Harvard Medical School, Boston, MA 02115, USA.
Cell
|April 30, 2019
概括
低氧水平可以恢复线粒体功能和活力
科学领域:
- 生物化学
- 遗传学
- 分子生物学
背景情况:
- 弗里德里希 (FRDA) 是一种严重的遗传性疾病,由frataxin (FXN) 基因突变引起.
- 素蛋白对铁硫 (Fe-S) 集群生物合成至关重要,对于细胞呼吸和活力至关重要.
- FXN 缺乏导致线粒体功能障碍,通常被认为是致命的.
研究的目的:
- 为了研究氧气水平在弗里德里希的病变产生中的作用.
- 通过调节氧气可用性来探索FRDA的潜在治疗策略.
主要方法:
- 在不同氧度下研究了缺乏FXN的酵母,人体细胞和线虫 (低氧和高氧).
- 分析了Fe-S集群水平,细胞信号通路 (ATF4,NRF2,IRP2) 和整体活力.
- 使用了体外溶解试验和暴露于不同氧气水平的FRDA小鼠模型.
主要成果:
- 缺乏FXN的生物和细胞在低氧条件下 (1% O2) 是可行的.
- 低氧恢复Fe-S集群水平,并使人体细胞中FRDA相关的信号通路正常化.
- 低氧增加生物可用铁,并通过HIF独立的机制直接激活Fe-S合成.
- 在小鼠模型中,中度低氧 (11% O2) 减轻了衰的进展,而高氧 (55% O2) 则加速了它.
结论:
- 氧气的可用性是影响FXN缺陷严重性的关键环境因素.
- 通过改善线粒体功能, 代表了弗里德里希的治疗途径.
- 了解氧气的作用为FRDA提供了机械洞察力和潜在的治疗策略.
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