相互c-Abl-GPx1调节通过ERK1/2-DRP1介导的线粒体动力学来控制CA1神经元对氧化应激的活力
Ji-Eun Kim1, Su Hyeon Wang1, Tae-Cheon Kang1
1Department of Anatomy and Neurobiology, Institute of Epilepsy Research, College of Medicine, Hallym University, Chuncheon, 24252, South Korea.
Neuropharmacology
|July 7, 2025
概括
在氧化应激过程中,c-Abl和谷氨过氧化酶-1 (GPx1) 之间的调节受损会导致CA1神经元死亡. 这通过破坏控制线粒体分裂的ERK1/2-DRP1通路而发生.
科学领域:
- 神经科学是一个神经科学.
- 细胞生物学 细胞生物学
- 生物化学 生物化学
背景情况:
- 阿贝尔森小鼠白血病病毒性瘤基因同源1 (c-Abl) 调节谷氨过氧化酶-1 (GPx1) 和细胞外信号调节激酶1/2 (ERK1/2).
- GPx1-ERK1/2通路影响了与胺相关的蛋白1 (DRP1) 酸化,影响了线粒体动力学.
- 由L-布氨酸硫胺 (BSO) 和状态 (SE) 引起的氧化应激会影响神经元的健康.
研究的目的:
- 研究c-Abl在GPx1-ERK1/2相互作用中的作用.
- 确定c-Abl在CA1神经元中氧化应激下的DRP1-介导的线粒体动态中的参与.
- 为了阐明CA1神经元退化背后的机制,以应对氧化侮辱.
主要方法:
- 利用BSO和SE模型在CA1神经元中诱导氧化应激.
- 已使用c-Abl抑制剂 (Imatinib) 和ERK1/2抑制剂 (U0126).
- 进行了GPx1淘汰实验并评估了c-Abl酸化,ERK1/2活性,DRP1表达/酸化和线粒体形态.
主要成果:
- BSO增加了c-Abl酸化,ERK1/2活性和GPx1上调;伊马替尼部分扭转了这些影响.
- GPx1 knockdown 加剧了BSO诱导的c-Abl酸化,并降低了ERK1/2活动.
- SE增加了c-Abl酸化和线粒体延长,同时降低了GPx1和ERK1/2水平;伊马替尼和N-乙半氨酸 (NAC) 减弱了这些影响.
结论:
- 在c-Abl和GPx1之间受损的互调有助于CA1神经元退化.
- 由于这种受损调节的ERK1/2-DRP1通路的破坏,废除了线粒体裂变.
- 针对这种途径可能为氧化应激诱导的神经元损伤提供治疗策略.
相关概念视频
G-Protein Gated Ion Channels
GPCRs are primarily responsible for our sense of smell, taste, and vision. The binding of a sensory stimulus activates GPCR to stimulate effector proteins, many of which are ion channels in the sensory organs. GPCRs modulate the opening and closing of the target ion channels either directly by binding them, or by releasing second messengers that activate these channels. As ions move across the membrane, the membrane potential is altered, which induces an appropriate response.
Sensory organs,...
Sensory organs,...
GPCRs Regulate Adenylyl Cylase Activity
Some GPCRs transmit signals through adenylyl cyclase (AC), a transmembrane enzyme. AC helps synthesize second messenger cyclic adenosine monophosphate (cAMP). AC catalyzes cyclization reaction and converts ATP to cAMP by releasing a pyrophosphate. The pyrophosphate is further hydrolyzed to phosphate by the enzyme pyrophosphatase, which drives cAMP synthesis to completion. However, cAMP is rapidly degraded to 5′ AMP by the enzymes phosphodiesterase (PDE), preventing overstimulation of cells.
Two...
Two...
cAMP-dependent Protein Kinase Pathways
Cyclic Adenosine Monophosphate (cAMP) is an essential second messenger that activates protein kinase A (PKA) and regulates various biological processes. A single epinephrine molecule binds to GPCR and activates several heterotrimeric G proteins, each stimulating multiple adenylyl cyclase, amplifying the signal, and synthesizing large numbers of cAMP molecules. Small changes in cAMP concentration affect PKA activity. The binding of four cAMP molecules induces a conformational change in PKA,...
Feedback Regulation of Calcium Concentration
Calcium is an essential signaling molecule required for various cellular functions. Calcium pumps and ion channels on cell and organellar membranes, such as those on the endoplasmic reticulum (ER), regulate calcium concentrations inside the cell. They remain closed, keeping the cytosolic calcium levels low at a resting state.
Various transmembrane receptors, such as G protein-coupled receptors (GPCRs), elicit a response to extracellular signals by increasing cytosolic calcium. Activated GPCRs...
Various transmembrane receptors, such as G protein-coupled receptors (GPCRs), elicit a response to extracellular signals by increasing cytosolic calcium. Activated GPCRs...
Calmodulin-dependent Signaling
Calmodulin (CaM) is a calcium-binding protein in eukaryotes that controls various calcium-regulated cellular processes. It has four calcium-binding sites that bind calcium to form the calcium-calmodulin ( Ca2+-CaM) complex. GPCR stimulation increases the calcium levels in the cells that bind to CaM and induces a conformational change.
The Ca2+-CaM complex does not have enzymatic activity by itself. Instead, the complex binds downstream target proteins, including membrane proteins or enzymes,...
The Ca2+-CaM complex does not have enzymatic activity by itself. Instead, the complex binds downstream target proteins, including membrane proteins or enzymes,...
Ligand-Gated Ion Channel Receptor: Gating Mechanism
Ligand-gated ion channels are transmembrane proteins that play a vital role in intercellular communication and functions of the nervous system. They allow the influx of ions across the membrane once the neurotransmitter binds, allowing the subsequent transmission of electrical excitation across the neurons. Other ligand-gated ion channels, like the γ-aminobutyric acid (GABA) receptor, permit anions like chloride into the cells on the binding of the GABA molecule. Their entry into the cell...


