线粒体Ca2+单载体b (MCUb) 调节神经元Ca2+动力学和对缺血性中风的抵抗力
Tam Nguyen1, Zhihong Lin1, Nirav Dhanesha2
1Department of Neuroscience and Pharmacology and Iowa Neuroscience Institute, University of Iowa College of Medicine, Iowa City, IA 52242, USA.
Cell calcium
|March 9, 2025
概括
线粒体单载体同源B (MCUb) 淘汰会增强大脑神经元中线粒体的吸收. 缺乏MCUB会使男性中风引起的脑损伤恶化,这表明它在神经元保护中起着性别相关的作用.
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
- 线粒体生物学 线粒体生物学
背景情况:
- 线粒体 (Ca2+) 运输对于神经元功能,如突触传输和生存至关重要.
- 线粒体单载体 (MCU) 复合体有助于 Ca2+ 吸收到线粒体.
- 作为MCU的对应物,MCUb调节了其他组织中的Ca2+运输,但其大脑功能尚不清楚.
研究的目的:
- 研究MCUb在调节大脑中线粒体Ca2+动态中的作用.
- 确定MCUB在神经元刺激毒性和中风引起的脑损伤中的参与.
主要方法:
- 生成的MCUb淘汰赛 (KO) 皮质神经元和小鼠.
- 同时监测细胞质和线粒体Ca2+度 ([Ca2+]cyt和[Ca2+]mt).
- 利用中脑动脉阻塞 (MCAO) 模型用于过渡性缺血性中风.
主要成果:
- MCUb KO增强了线粒体的Ca2+吸收,降低了皮层神经元中Ca2+诱导的门.
- 删除MCUb加速了线粒体功能障碍和由谷氨酸酸诱导的兴奋毒性.
- 在雄性小鼠中,MCUb KO显著增加了MCAO诱导的大脑损伤,但不是雌性小鼠.
结论:
- MCUB在调节神经元Ca2+恒温和兴奋毒性方面发挥着重要作用.
- 在缺血性中风后,MCUB缺乏会以男性特有的方式加剧大脑损伤.
- MCUB成为潜在的中风治疗点,并考虑性别特异性.
相关概念视频
01:45Mitochondrial Membranes
7.0K
A single mitochondrion is a bean-shaped organelle enclosed by a double-membrane system. The outer membrane of mitochondria is smooth and contains many porins - the integral membrane transporters. Porins enable free diffusion of ions and small uncharged molecules through the outer mitochondrial membrane but limit the transport of molecules larger than 5000 Daltons. Further, the outer mitochondrial membrane forms a unique structure called membrane contact sites with other subcellular organelles,...
7.0K
01:28The Inner Mitochondrial Membrane
3.2K
The inner mitochondrial membrane is the primary site of ATP synthesis. The inner membrane domain that forms a smooth layer adjacent to the outer membrane is called the inner boundary membrane. This domain contains membrane transporters that drive metabolites in and out of the mitochondria. In contrast, the inner membrane network that invaginates into the matrix space is called the cristae membrane. This domain accounts for principle mitochondrial function as it accommodates the protein...
3.2K
01:27Feedback Regulation of Calcium Concentration
3.3K
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...
3.3K
01:32Chemiosmosis
96.6K
Oxidative phosphorylation is a highly efficient process that generates large amounts of adenosine triphosphate (ATP), the basic unit of energy that drives many cellular processes. Oxidative phosphorylation involves two processes— the electron transport chain and chemiosmosis.
Electron Transport Chain
The electron transport chain involves a series of protein complexes on the inner mitochondrial membrane that undergo a series of redox reactions. At the end of this chain, the electrons...
Electron Transport Chain
The electron transport chain involves a series of protein complexes on the inner mitochondrial membrane that undergo a series of redox reactions. At the end of this chain, the electrons...
96.6K
01:16Calmodulin-dependent Signaling
5.1K
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,...
5.1K
01:37Mitochondria
9.3K
Mitochondria are eukaryotic cellular organelles that are known to produce energy through a process called oxidative phosphorylation. Besides their primary function, mitochondria are involved in various cellular processes, including cell growth, differentiation, signaling, metabolism, and senescence. Age-related changes cause a decline in mitochondrial quality and integrity due to increased mitochondrial mutations and oxidative damage. Thus, aging can severely impact mitochondrial functions,...
9.3K