School of Public Health, Fudan University, Shanghai, 200032, PR China; Department of Toxicology, School of Public Health, Guangxi Medical University, Nanning, Guangxi Province, 530021, PR China.
Department of Toxicology, School of Public Health, Guangxi Medical University, Nanning, Guangxi Province, 530021, PR China; School of Traditional Chinese Medicine, Capital Medical University, Beijing, 100069, PR China.
Cancer Lett. 2024 Apr 10;587:216728. doi: 10.1016/j.canlet.2024.216728. Epub 2024 Feb 29.
Lysosomes are crucial organelles responsible for the degradation of cytosolic materials and bulky organelles, thereby facilitating nutrient recycling and cell survival. However, lysosome also acts as an executioner of cell death, including ferroptosis, a distinctive form of regulated cell death that hinges on iron-dependent phospholipid peroxidation. The initiation of ferroptosis necessitates three key components: substrates (membrane phospholipids enriched with polyunsaturated fatty acids), triggers (redox-active irons), and compromised defence mechanisms (GPX4-dependent and -independent antioxidant systems). Notably, iron assumes a pivotal role in ferroptotic cell death, particularly in the context of cancer, where iron and oncogenic signaling pathways reciprocally reinforce each other. Given the lysosomes' central role in iron metabolism, various strategies have been devised to harness lysosome-mediated iron metabolism to induce ferroptosis. These include the re-mobilization of iron from intracellular storage sites such as ferritin complex and mitochondria through ferritinophagy and mitophagy, respectively. Additionally, transcriptional regulation of lysosomal and autophagy genes by TFEB enhances lysosomal function. Moreover, the induction of lysosomal iron overload can lead to lysosomal membrane permeabilization and subsequent cell death. Extensive screening and individually studies have explored pharmacological interventions using clinically available drugs and phytochemical agents. Furthermore, a drug delivery system involving ferritin-coated nanoparticles has been specifically tailored to target cancer cells overexpressing TFRC. With the rapid advancements in understandings the mechanistic underpinnings of ferroptosis and iron metabolism, it is increasingly evident that lysosomes represent a promising target for inducing ferroptosis and combating cancer.
溶酶体是负责降解细胞质物质和大型细胞器的关键细胞器,从而促进营养物质的回收和细胞存活。然而,溶酶体也充当细胞死亡的执行者,包括铁死亡,这是一种独特的受调控的细胞死亡形式,依赖于铁依赖性磷脂过氧化。铁死亡的发生需要三个关键组成部分:底物(富含多不饱和脂肪酸的膜磷脂)、触发因素(氧化还原活性铁)和受损的防御机制(GPX4 依赖和独立的抗氧化系统)。值得注意的是,铁在铁死亡细胞死亡中起着关键作用,特别是在癌症中,铁和致癌信号通路相互加强。鉴于溶酶体在铁代谢中的核心作用,已经设计了各种策略来利用溶酶体介导的铁代谢来诱导铁死亡。这些策略包括通过铁蛋白自噬和线粒体自噬分别从细胞内储存部位(如铁蛋白复合物和线粒体)重新动员铁。此外,TFEB 对溶酶体和自噬基因的转录调节增强了溶酶体的功能。此外,诱导溶酶体铁过载会导致溶酶体膜通透性增加和随后的细胞死亡。广泛的筛选和个体研究已经探索了使用临床可用药物和植物化学物质的药理学干预。此外,还专门设计了一种涉及铁蛋白涂层纳米颗粒的药物输送系统,以靶向过度表达 TFRC 的癌细胞。随着对铁死亡和铁代谢的机制基础的理解的迅速进展,溶酶体作为诱导铁死亡和对抗癌症的有前途的靶点越来越明显。
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