PGRMC2是一种压力-体积调节器,对肌肉心脏对小鼠压力的反应至关重要
Farideh Amirrad1,2, Vivian La1, Sharareh Ohadi1
1Department of Biomedical and Pharmaceutical Sciences, Chapman University, Irvine, CA, USA.
Nature communications
|March 12, 2025
概括
孕激素受体膜成分-2 (PGRMC2) 通过调节快速信号来调节心脏功能. 它的缺失会损害心脏输出,并在压力下导致心力衰竭.
科学领域:
- 心脏病学 心脏病学
- 分子内分泌学分子内分泌学
- 生理学 生理学 生理学
背景情况:
- 孕激素受体是细胞信号传递的关键.
- 蛋白质组学研究表明,孕激素受体膜成分-2 (PGRMC2) 和心脏病之间存在联系.
- 目前尚不清楚PGRMC2在心脏功能中的具体作用.
研究的目的:
- 为了研究PGRMC2在心脏中的功能.
- 确定PGRMC2在调节心脏生理学和应激反应中的作用.
主要方法:
- 产生一种特定于心脏的淘汰赛小鼠模型 (MyH6•Pgrmc2flox/flox) 通过选择性删除心肌细胞中的Pgrmc2基因.
- 评估心脏功能,包括压力-体积关系,在淘汰和野生类型的小鼠.
- 在低氧条件下对心脏反应的评估.
主要成果:
- PGRMC2调解心肌细胞中的快速信号,这对于维持心脏收缩,中风量和心脏输出至关重要.
- 在心肌细胞中删除PGRMC2会损害雄性和雌性小鼠的心脏压力-体积关系.
- 缺氧压力加剧了压力-体积失调,导致PGRMC2缺陷心脏的左心室和右心室阻塞性衰竭.
结论:
- PGRMC2是心脏压力-体积关系的关键调节器.
- PGRMC2在维持正常的心脏生理学方面发挥着至关重要的作用,特别是在低氧压力下.
- 在快速的心脏信号传递中,PGRMC2充当类固醇激素的调解者.
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...
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...


