铁硫生物合成的急性抑制会破坏小鼠的代谢灵活性
bioRxiv : the preprint server for biology
|September 4, 2024
概括
在小鼠中抑制铁硫 (ISC) 合成,通过增加脂质使用,迅速减少体脂. 这种ISC功能障碍导致了代谢不灵活性,影响了燃料选择和疾病风险.
科学领域:
- 生物化学 生物化学
- 细胞生物学 细胞生物学
- 代谢性疾病研究研究
背景情况:
- 铁硫集群 (ISC) 是许多蛋白质的重要辅因子,包括氧化酸化 (OXPHOS),DNA复制和铁感应中的蛋白质.
- ISC生物合成缺陷与各种健康问题有关,如贫血,神经退行性疾病和代谢障碍.
研究的目的:
- 使用新型小鼠模型研究ISC生物合成的急性和可逆抑制对全身的影响.
- 了解因抑制ISC生产而导致的代谢后果和生物燃料利用变化.
主要方法:
- 开发了一种小鼠模型,允许急性和可逆性抑制关键的ISC生物合成酶NFS1.1.
- 分析了代谢参数,包括脂肪,热量摄入,身体活动和NFS1抑制后的关键蛋白质水平.
- 评估了年龄对被抑制ISC合成的小鼠代谢后果和生存率的影响.
主要成果:
- 全球急性NFS1抑制导致脂肪的快速丧失和脂质利用的增加,独立于热量摄入量或活动水平.
- 缺少ISC导致关键蛋白质水平降低,这些蛋白质参与了OXPHOS,脂酸合成和胰岛素处理,导致代谢不灵活.
- 与年龄相关的代谢变化显著减轻了NFS1抑制的小鼠的脂肪损失和延长生存时间.
- 抑制NFS1诱导了葡萄糖双平衡,与胰腺β细胞中的ISC缺乏有关.
结论:
- ISC代谢极大地影响着生物体的燃料选择,影响脂质利用和能量储存.
- 急性ISC抑制导致广泛的代谢干扰,导致代谢不灵活性和糖尿病的可能性.
- 这些发现提供了关于ISC相关疾病背后的机制及其与代谢功能障碍的关联的见解.
相关概念视频
The Electron Transport Chain
16.3K
The electron transport chain or oxidative phosphorylation is an exothermic process in which free energy released during electron transfer reactions is coupled to ATP synthesis. This process is a significant source of energy in aerobic cells, and therefore inhibitors of the electron transport chain can be detrimental to the cell's metabolic processes.
Inhibitors of the electron transport chain
Rotenone, a widely used pesticide, prevents electron transfer from Fe-S cluster to ubiquinone or Q...
Inhibitors of the electron transport chain
Rotenone, a widely used pesticide, prevents electron transfer from Fe-S cluster to ubiquinone or Q...
16.3K
Electron Transport Chain: Complex I and II
12.3K
The mitochondrial electron transport chain (ETC) is the main energy generation system in the eukaryotic cells. However, mitochondria also produce cytotoxic reactive oxygen species (ROS) due to the large electron flow during oxidative phosphorylation. While Complex I is one of the primary sources of superoxide radicals, ROS production by Complex II is uncommon and may only be observed in cancer cells with mutated complexes.
ROS generation is regulated and maintained at moderate levels necessary...
ROS generation is regulated and maintained at moderate levels necessary...
12.3K


