两个光子光激光显微镜对G蛋白结合受体 (GPCR) 激原体和对抗体的实时分化
Minying Cai1, Magda Stankova, Stephanie J K Pond
1Department of Chemistry, University of Arizona, 1306 East University, Tucson, Arizona 85721, USA.
Journal of the American Chemical Society
|June 10, 2004
概括
G蛋白结合受体 (GPCRs) 是细胞信号的关键调节者. 激素激活会通过β-arrestin引起快速的受体内化,这是对脱敏的必要过程.
科学领域:
- 细胞生物学 细胞生物学
- 分子药理学分子药理学
- 生物化学 生物化学
背景情况:
- G蛋白结合受体 (GPCRs) 对于细胞调节至关重要.
- GPCR脱敏是一种控制细胞对激动剂反应的基本过程.
- 了解GPCR信号对于药物发现和开发至关重要.
研究的目的:
- 为了研究人类黑色皮质素,三角类阿片类药物和葡萄糖素受体的实时细胞信号动态.
- 为了区分受体激动剂与对抗剂的信号通路.
- 阐明β-arrestin在GPCR无敏化和内化中的作用.
主要方法:
- 利用合成光标记的配体来跟踪受体-配体相互作用.
- 采用光蛋白标记的β-arrestin和受体来可视化细胞过程.
- 应用实时成像技术进行活细胞分析.
主要成果:
- 研究的GPCRs的激素刺激诱导了连接体-受体复合体的快速内化.
- 对抗剂与受体的相互作用没有导致显著的内化.
- 证明受体内化是依赖于β-阿雷斯的.
- 贝塔阿雷斯调解了cAMP信号通路的快速脱敏.
结论:
- 由GPCR激动剂诱导的内部化是一个依赖于β-arrestin的过程.
- 这种机制对于细胞信号的快速脱敏至关重要.
- 开发的光方法使实时药物查和GPCRs的机制研究成为可能.
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相关概念视频
G-protein Coupled Receptors
G-protein coupled receptors are ligand binding receptors that indirectly affect changes in the cell. The actual receptor is a single polypeptide that transverses the cell membrane seven times creating intracellular and extracellular loops. The extracellular loops create a ligand specific pocket which binds to neurotransmitters or hormones. The intracellular loops holds onto the G-protein.
G-protein Coupled Receptors
G-protein coupled receptors are ligand binding receptors that indirectly affect changes in the cell. The actual receptor is a single polypeptide that transverses the cell membrane seven times creating intracellular and extracellular loops. The extracellular loops create a ligand specific pocket which binds to neurotransmitters or hormones. The intracellular loops holds onto the G-protein.
G Protein-coupled Receptors
G Protein-Coupled Receptors or GPCRs are membrane-bound receptors that transiently associate with heterotrimeric G proteins and induce an appropriate response to sensory stimuli such as light, odors, hormones, cytokines, or neurotransmitters.
GPCRs are also called heptahelical, 7TM, or serpentine receptors, and consist of seven (H1-H7) transmembrane alpha-helices that span the bilayer to form a cylindrical core. The transmembrane helices are connected by three extracellular loops and three...
GPCRs are also called heptahelical, 7TM, or serpentine receptors, and consist of seven (H1-H7) transmembrane alpha-helices that span the bilayer to form a cylindrical core. The transmembrane helices are connected by three extracellular loops and three...
GPCR Desensitization
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...
Transducer Mechanism: G Protein–Coupled Receptors
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, 7TM, or...
GPCRs are also called heptahelical, 7TM, or...
