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相关概念视频

Feedback Regulation of Calcium Concentration01:27

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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.
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Calcium ions are essential to contract smooth muscle cells in blood vessels. They enter these cells through voltage-dependent calcium channels, specifically L-type calcium channels in the cell membrane. These L-type calcium channels are integral to the excitation-contraction coupling process in smooth muscle. When a stimulus is received by smooth muscle cells, their membrane depolarizes. This alteration in membrane potential instigates the opening of L-type calcium channels. As a result,...
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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...
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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.
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Mechanically-gated ion channels are proteins found in eukaryotic and prokaryotic cell membranes that open in response to mechanical stress. Tension, compression, swelling, and shear stress can alter the conformation of the protein, opening a transmembrane channel that allows the passage of ions for signal transmission. In eukaryotes, mechanically-gated channels are distributed in several regions like the neurons, lungs, skin, bladder, and heart, where they play critical roles in numerous...
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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.
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暂时受体潜力 (TRP) 道的作用,这些道是血液视网膜屏障功能障碍中异常信号的基础.

Silvia Dragoni1, Francesco Moccia2, Martin D Bootman3

  • 1Institute of Ophthalmology, University College London, London EC1V 9EL, United Kingdom S.Dragoni@brighton.ac.uk.

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概括

视网膜内皮细胞中的短暂受体潜能 (TRP) 通道对于内部血视网膜屏障 (iBRB) 至关重要. 通过TRP通道的信号失调有助于iBRB功能障碍和视网膜疾病.

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科学领域:

  • 眼科医生 眼科 眼科
  • 细胞生物学 细胞生物学
  • 生理学 生理学 生理学

背景情况:

  • 内血视网膜屏障 (iBRB) 通过调节血液和神经组织之间的运输来维持视网膜平衡.
  • 内皮细胞 (ECs) 形成iBRB,利用紧密的结节来限制分子和细胞通道.
  • iBRB功能障碍与各种视网膜疾病有关,血管内皮生长因子 (VEGF) 是一个关键的治疗点.

研究的目的:

  • 在iBRB功能背景下,探索 (Ca2+) 信号在视网膜内皮细胞中的作用.
  • 调查短暂受体潜力 (TRP) 通道作为视网膜疾病的新型治疗点的潜力.
  • 提供iBRB结构,功能和TRP道的新兴角色的全面概述.

主要方法:

  • 在视网膜内皮细胞中对iBRB,Ca2+信号传递和TRP通道进行现有研究的文献综述和综合.
  • 对iBRB功能障碍背后的分子机制的分析.
  • 讨论视网膜中TRP通道的生理和病理作用.

主要成果:

  • (Ca2+) 稳态对于iBRB的完整性至关重要.
  • 参与Ca2+信号传递的TRP通道存在于视网膜EC中,并影响IBRB功能.
  • 在视网膜疾病中,TRP通道活动的调节失调可能会导致iBRB分解.

结论:

  • TRP通道代表了一种有希望的,但尚未被充分探索的治疗途径,用于治疗与iBRB功能障碍相关的视网膜疾病.
  • 针对由TRP通道介导的Ca2+信号通路,可以提供超越VEGF抑制的替代治疗策略.
  • 进一步研究TRP通道在视网膜EC中的特定作用是有必要的,以开发有效的治疗方法.