興奮毒性ニューロンの死には,超酸化物が体積調節アニオンチャネルを通ってニューロンに侵入する必要があります
Kate Harris1,2, Seok Joon Won1,2, Gokhan Uruk1,2
1Department of Neurology, University of California San Francisco, San Francisco, CA, USA.
Science advances
|August 29, 2025
まとめ
スーパーオキシドは体積調節アニオンチャネル (VRAC) を経由してニューロンに侵入し,酸化損傷を引き起こす. VRACsまたはそのLRRC8Aサブユニットを阻害すると,神経細胞を興奮毒性損傷から保護し,新しい治療目標を提供します.
科学分野:
- 神経科学
- 細胞生物学
- 生物化学
背景:
- 脳卒中によるニューロンの死は,N-メチル-d-アスパルテート (NMDA) 受容体の過剰活性化を含む.
- NMDA受容体の刺激により,窒素酸化物と超酸化物が生成され,酸化性損傷を引き起こします.
- アニオンであるスーパーオキシドは 細胞膜を簡単に 通過できません
研究 の 目的:
- 超酸化物が神経細胞に 侵入するメカニズムを調べるため
- 量調節アニオンチャネル (VRAC) が超酸化物流入を媒介するかどうかを決定する.
- 興奮毒性ニューロン損傷におけるVRACを標的とした治療の可能性を評価する.
主な方法:
- 主要なニューロン培養とマウス皮質モデルを使用した.
- 実験では,N-メチル-d-アスパルテート (NMDA) 受容体刺激と外因的超酸化物被曝が行われました.
- VRAC阻害剤のDCPIBとLRRC8Aサブユニットの遺伝的破壊が使用されました.
- HeLa細胞は,特定のLRRC8Aサブユニットの組み合わせの機能を研究するために使用されました.
主要な成果:
- 超酸化物は VRAC を経由してニューロンに侵入することが示された.
- DCPIBによるVRACの抑制またはLRRC8Aの破壊は,NMDA誘発およびイシュケミア誘発の酸化神経損傷を予防しました.
- 特定のLRRC8Aサブユニット組成 (LRRC8A/C,LRRC8A/E) は,神経細胞以外の細胞に超酸化導電性を授与した.
結論:
- VRACを通じた超酸化物流は興奮毒性ニューロンの死における重要なステップです.
- VRACをターゲットに,特にそのサブユニットの組成と機能をターゲットにすることは,神経保護のための有望な戦略です.
関連する概念動画
01:30Ligand-Gated Ion Channel Receptor: Gating Mechanism
2.6K
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...
2.6K
01:19The Role of Ion Channels in Neuronal Computation
3.3K
A postsynaptic neuron usually receives numerous impulses from several other presynaptic neurons. The axon hillock of the postsynaptic neuron integrates all these signals and determines the likelihood of firing an action potential.
Sometimes a single EPSP is strong enough to induce an action potential in the postsynaptic neuron. However, multiple presynaptic inputs must often create EPSPs around the same time for the postsynaptic neuron to be sufficiently depolarized to fire an action potential....
Sometimes a single EPSP is strong enough to induce an action potential in the postsynaptic neuron. However, multiple presynaptic inputs must often create EPSPs around the same time for the postsynaptic neuron to be sufficiently depolarized to fire an action potential....
3.3K
01:26Voltage-gated Ion Channels
8.6K
Voltage-gated ion channels are transmembrane proteins that open and close in response to changes in the membrane potential. They are present on the membranes of all electrically excitable cells such as neurons, heart, and muscle cells.
Generally, all voltage-gated ion channels have a 'voltage-sensing domain' that spans the lipid bilayer. The charged residues in the sensor move in response to the membrane potential changes that open the channel allowing ions movement. There are several...
Generally, all voltage-gated ion channels have a 'voltage-sensing domain' that spans the lipid bilayer. The charged residues in the sensor move in response to the membrane potential changes that open the channel allowing ions movement. There are several...
8.6K
01:17The Extrinsic Apoptotic Pathway
6.6K
The extrinsic apoptotic pathway is initiated when extracellular death-inducing signals, such as specific cytokines, activate the death receptors expressed on the cell surface. The immune cells involved in this pathway are natural killer cells (NK cells) and cytotoxic T-lymphocytes. NK cells are critical in innate immune response, while cytotoxic T-lymphocytes are associated with adaptive immune response. These cells recognize specific receptors expressed on the altered cells and activate...
6.6K
01:30Overview of Cell Death
7.7K
Cell death is an essential process where the body gets rid of old or damaged cells. Cell proliferation and death need to be balanced, as an imbalance between the two may lead to cancer or autoimmune diseases.
Cell death was observed in the early 19th century, but there was no experimental evidence to prove it. In 1842, Carl Vogt first discovered cell death in a metamorphic toad; however, it was not termed ‘cell death.’ Scientists discovered different cell death pathways only in the...
Cell death was observed in the early 19th century, but there was no experimental evidence to prove it. In 1842, Carl Vogt first discovered cell death in a metamorphic toad; however, it was not termed ‘cell death.’ Scientists discovered different cell death pathways only in the...
7.7K
01:16Necrosis
4.8K
Necrosis is considered as an “accidental” or unexpected form of cell death that ends in cell lysis. The first noticeable mention of “necrosis” was in 1859 when Rudolf Virchow used this term to describe advanced tissue breakdown in his compilation titled “Cell Pathology”.
Morphological Manifestations of Necrosis
Necrotic cells show different types of morphological appearance depending on the type of tissue and infection. In coagulative necrosis, cells become...
Morphological Manifestations of Necrosis
Necrotic cells show different types of morphological appearance depending on the type of tissue and infection. In coagulative necrosis, cells become...
4.8K