含有GluA2的AMPA受体形成了一个连续的Ca2+透道
Federico Miguez-Cabello1, Xin-Tong Wang1,2, Yuhao Yan1,2
1Department of Pharmacology and Therapeutics, McGill University, Montreal, Quebec, Canada.
Nature
|March 20, 2025
概括
与之前的观点相反,含有GluA2的α-amino-3-hydroxy-5-methyl-4-isoxazolepropionic acid受体 (AMPAR) 允许 (Ca2+) 通过. 辅助子单元动态控制这种Ca2+透性,影响大脑信号和疾病.
科学领域:
- 神经科学是一个神经科学.
- 分子生物学分子生物学
- 生物物理学的生物物理.
背景情况:
- 哺乳动物大脑中的快速激发性神经传递依赖于选择性的α-amino-3-hydroxy-5-methyl-4-isoxazolepropionic酸受体 (AMPARs).
- AMPARs对于突触可塑性,学习,记忆和维持质质突触平衡至关重要.
- AMPAR误解突变与自闭症和智力障碍等神经系统疾病有关.
研究的目的:
- 挑战含有GluA2的AMPARs中Ca2+不透性的传统理解.
- 调查影响AMPARs中Ca2+透性的因素.
- 阐明AMPARs在Ca2+信号传递中的作用以及相关神经疾病的发病因.
主要方法:
- 电生理学记录以评估离子通道特性.
- 对AMPAR四分体的结构分析及其与辅助子单元的相互作用.
- 研究亚单元组成和辅助蛋白对Ca2+流量的影响.
主要成果:
- 含有GluA2的AMPAR表现出Ca2+透性的光谱,而不是完全的不透性.
- Ca2+的透性是由AMPAR子单元组成和辅助蛋白 (TARPγs,大) 调节的.
- Ca2+的流入是由细胞外结合点促进的,并由改变选择性过器的辅助子单元调节.
结论:
- AMPARs在大脑的Ca2+信号传递中扮演着比以前认为的更重要的角色.
- 辅助子单元对AMPAR Ca2+透性的动态调节为误解突变引起的疾病提供了机械洞察力.
- 这项研究重新定义了对AMPAR功能及其对神经健康和疾病的影响的理解.
相关概念视频
Ligand-Gated Ion Channel Receptor: Gating Mechanism
2.1K
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...
2.1K
Ligand-gated Ion Channels
12.1K
Ligand-gated ion channels are transmembrane proteins with a channel for ions to pass through and a binding site for a ligand. The channel opens only when a ligand attaches to the binding site.
Three Subfamilies of Ligand-gated Ion Channels
Ligand-gated ion channels fall into three subfamilies. The 'Cys-loop' includes the nicotinic acetylcholine receptors, γ-aminobutyric acid (GABA), glycine, and 5-hydroxytryptamine receptors. The second one is the 'Pore-loop' channels that...
Three Subfamilies of Ligand-gated Ion Channels
Ligand-gated ion channels fall into three subfamilies. The 'Cys-loop' includes the nicotinic acetylcholine receptors, γ-aminobutyric acid (GABA), glycine, and 5-hydroxytryptamine receptors. The second one is the 'Pore-loop' channels that...
12.1K
GPCR Desensitization
5.7K
G protein-coupled receptor (GPCR) signaling plays a crucial role in cell functioning. GPCR desensitization is an equally essential process. It allows cells to respond to changing environments and regain sensitivity to new stimuli while preventing unnecessary stimulation when no longer needed. Prolonged exposure to stimuli leads to GPCR desensitization. It involves blocking the receptors from binding and activating additional G proteins. This inhibits activation of downstream effectors, thereby...
5.7K
Adrenergic Receptors: ɑ Subtype
1.4K
Adrenoceptors are classified into α and ꞵ classes based on their potencies to catecholamine agonists. α-adrenoceptors show the following order of catecholamine potency:
Adrenaline ≥ Noradrenaline >> Isoprenaline
α-adrenoceptors are further divided into α1 and α2-adrenoceptors.
α1-Adrenoceptors: These receptors are located postsynaptically on the effector organs and cause constriction of smooth muscle mediated by activation of phospholipase...
Adrenaline ≥ Noradrenaline >> Isoprenaline
α-adrenoceptors are further divided into α1 and α2-adrenoceptors.
α1-Adrenoceptors: These receptors are located postsynaptically on the effector organs and cause constriction of smooth muscle mediated by activation of phospholipase...
1.4K
G-Protein Gated Ion Channels
4.5K
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...
Sensory...
4.5K
Transducer Mechanism: G Protein–Coupled Receptors
1.8K
G Protein–Coupled Receptors (GPCRs) are membrane-bound receptors that transiently associate with heterotrimeric G proteins and induce an appropriate response to various stimuli. GPCRs regulate critical physiological pathways and are excellent drug targets for treating diseases such as diabetes, cancer, obesity, depression, or Alzheimer's. Nearly 35% of approved drugs implement their therapeutic effects by selectively interacting with specific GPCRs.
GPCRs are also called heptahelical,...
GPCRs are also called heptahelical,...
1.8K


