IRE1α通过调节谷氨合成来确定铁灭的敏感性
Dadi Jiang1, Youming Guo2, Tianyu Wang2,3
1Department of Radiation Oncology, The University of Texas MD Anderson Cancer Center, Houston, TX, USA. djiang2@mdanderson.org.
Nature communications
|May 15, 2024
概括
需要伊诺西的酶1 (IRE1α) 通过控制谷氨合成来调节铁灭的敏感性. 抑制IRE1α可减少铁亡和损伤,提供一种潜在的治疗策略.
科学领域:
- 细胞生物学 细胞生物学
- 生物化学 生物化学
- 分子医学是分子医学.
背景情况:
- 细胞对受控细胞死亡途径铁亡的敏感性主要由脂质氧化物解毒机制控制.
- 需要内醇的酶1α (IRE1α),一种内细胞网膜蛋白质,对未折叠蛋白质反应 (UPR) 至关重要,在铁灭调节中起到了新发现的作用.
研究的目的:
- 研究IRE1α在调节细胞对铁亡的敏感性中的作用.
- 阐明IRE1α影响铁亡的分子机制.
- 评估IRE1α抑制在与铁亡相关的疾病中的治疗潜力.
主要方法:
- 评估具有改变IRE1α表达或活性的细胞中的铁灭敏感性.
- 分析IRE1α对谷氨生物合成调节者的mRNA水平的影响.
- 在小鼠模型中评估IRE1α缺乏和药理抑制对铁亡和缺血-再输液损伤的影响.
主要成果:
- IRE1α的消耗使人对铁亡产生抵抗力,而增加IRE1α的表达增强了敏感性.
- IRE1α的内啡核酶活性降低了谷氨酸-氨酸酶催化子单元 (GCLC) 和溶解物载体家族7成员11 (SLC7A11) mRNA的低调,这是谷氨酸合成的关键调节者.
- 在小鼠中,IRE1α的遗传或药理抑制有效地抑制铁亡并减少缺血-再输液损伤.
结论:
- IRE1α在确定细胞铁亡敏感性方面发挥着重要的,以前未知的作用,独立于其UPR功能.
- IRE1α抑制成为缓解与铁死相关的病理状况的有希望的治疗途径.
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