通过调节NADPH恒温,NADK控制着铁灭的敏感性
Xinyi Chen1, Yingying Zhang1, Dandan Song1
1School of Public Health and Nursing, Hangzhou Normal University, Hangzhou 311121, China.
Antioxidants (Basel, Switzerland)
|December 30, 2025
概括
纳德激酶 (NADK) 调节铁亡,这是细胞死亡的途径. 它通过产生NADPH来推动抗氧化防御,这对于保护细胞免受铁依赖的脂质过氧化和氧化应激至关重要.
科学领域:
- 细胞生物学 细胞生物学
- 生物化学 生化学
- 代谢过程中的代谢.
背景情况:
- 铁亡是一种依赖于铁的细胞死亡途径,由抗氧化剂系统调节,特别是谷氨 (GSH) -谷氨过氧化酶4 (GPX4) 轴.
- 酶 (NADK) 是主要的细胞质酶,负责将NAD+转化为NADP+,这对于NADPH依赖的抗氧化防御是必不可少的.
- 纳德基在铁灭调节中的确切作用尚未完全阐明.
研究的目的:
- 为了研究NAD激酶 (NADK) 在ferroptosis调节中的作用.
- 确定NADK活动如何影响细胞氧化还原平衡和对铁灭的易感性.
- 探索NADK与 ferroptosis 相关的其他关键酶和代谢物之间的代谢相互作用.
主要方法:
- 用于实验的铁灭敏感HT1080细胞.
- 采用药理抑制 (thioNAM),siRNA介导的淘汰,以及NADK的等离子体驱动过度表达.
- 评估了细胞活力,氧化还原代谢物 (NADPH,GSH),氧化应激标志物 (ROS,MDA) 和蛋白质表达.
- 使用尼古丁胺胺 mononucleotide (NMN),葡萄糖-6-酸盐脱酶 (G6PD) 和酶 1 (ME1) 的研究代谢相互作用.
主要成果:
- 药理上抑制或淘汰NADK降低了NADP (H) 水平,使细胞对铁亡敏感,并增加了脂质过氧化.
- 过度表达NADK恢复了NADPH和GSH水平,从而产生对铁亡的抵抗力.
- NADK对G6PD和ME1介导的NADPH产生,铁灭菌耐药性和NMN的铁灭菌救援作用至关重要.
结论:
- 通过NADPH合成,NAD酶 (NADK) 通过维护氧化还原稳态维持铁灭调节起着至关重要的作用.
- NADK充当代谢枢纽,将NAD+救援途径 (例如NMN) 与通过G6PD和ME1.1产生的NADPH联系起来.
- 向NADK为与铁亡相关的疾病提供了潜在的治疗策略.
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