Voltage-gated calcium channel (original) (raw)

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전압 개폐 칼슘 통로(VDCC,Voltage-gated calcium channel)는 세포막에 존재하면서 막 전압에 따라 열리고 닫히면서 칼슘을 통과시키는 막 단백질이다. 신경세포, 근육세포, 등 흥분성세포의 막에 주로 존재하면서 신경세포에서는 신경전달물질의 분비를, 근육세포에서는 세포의 수축을, 에서는 분비를 일으킨다.

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dbo:abstract Voltage-gated calcium channels (VGCCs), also known as voltage-dependent calcium channels (VDCCs), are a group of voltage-gated ion channels found in the membrane of excitable cells (e.g., muscle, glial cells, neurons, etc.) with a permeability to the calcium ion Ca2+. These channels are slightly permeable to sodium ions, so they are also called Ca2+-Na+ channels, but their permeability to calcium is about 1000-fold greater than to sodium under normal physiological conditions. At physiologic or resting membrane potential, VGCCs are normally closed. They are activated (i.e.: opened) at depolarized membrane potentials and this is the source of the "voltage-gated" epithet. The concentration of calcium (Ca2+ ions) is normally several thousand times higher outside the cell than inside. Activation of particular VGCCs allows a Ca2+ influx into the cell, which, depending on the cell type, results in activation of calcium-sensitive potassium channels, muscular contraction, excitation of neurons, up-regulation of gene expression, or release of hormones or neurotransmitters. VGCCs have been immunolocalized in the zona glomerulosa of normal and hyperplastic human adrenal, as well as in aldosterone-producing adenomas (APA), and in the latter T-type VGCCs correlated with plasma aldosterone levels of patients. Excessive activation of VGCCs is a major component of excitotoxicity, as severely elevated levels of intracellular calcium activates enzymes which, at high enough levels, can degrade essential cellular structures. (en) 전압 개폐 칼슘 통로(VDCC,Voltage-gated calcium channel)는 세포막에 존재하면서 막 전압에 따라 열리고 닫히면서 칼슘을 통과시키는 막 단백질이다. 신경세포, 근육세포, 등 흥분성세포의 막에 주로 존재하면서 신경세포에서는 신경전달물질의 분비를, 근육세포에서는 세포의 수축을, 에서는 분비를 일으킨다. (ko) 電位依存性カルシウムチャネル(でんいいぞんせいカルシウムチャネル、英: voltage-gated calcium channel(VGCC)、voltage-dependent calcium channel(VDCC))はカルシウムイオン(Ca2+)透過性を有するカルシウムチャネルの一種で、電位依存性イオンチャネルのグループで、興奮性細胞(筋肉、グリア細胞、神経細胞など)の膜に存在する。VGCCはわずかにナトリウムイオン(Na+)も透過させるためCa2+-Na+チャネルとも呼ばれるが、生理的条件下ではカルシウムの透過性はナトリウムよりも約1000倍高い。生理的な静止膜電位下では、通常VGCCは閉じている。膜電位の脱分極によって活性化される(開く)ため、「電位依存性」という名称がついている。通常、細胞外のCa2+の濃度は細胞内よりも数千倍高いため、VGCCの活性化によってCa2+が細胞へ流入し、細胞種によってカルシウム感受性カリウムチャネルの活性化、筋収縮、神経の興奮、遺伝子発現のアップレギュレーション、ホルモンや神経伝達物質の放出などが引き起こされる。VGCCは正常なもしくは過形成をきたした副腎の球状層(zona glomerulosa)とアルドステロン産生腺腫に局在しており、後者においてはT型VGCCのレベルは患者の血漿アルドステロンレベルと相関している。VGCCの過剰の活性化は興奮毒性の主要な要素であり、細胞内のカルシウムレベルの過度な上昇によって細胞構造を分解する酵素群が活性化される。 (ja) Canais de cálcio dependentes de voltagem são um grupo de canais iónicos dependentes de voltagem encontrados em células excitáveis (músculo, células da glia, neurónios, etc.) com permeabilidade para o ion Ca2+. Em potencial de membrana em repouso, estes canais estão normalmente fechados. São activados com membrana despolarizada. A activação de canais de cálcio dependentes de voltagem particulares permite que o cálcio entre na célula, o que dependendo do tipo de célula, resulta em contração muscular, excitação de neurónios, regulação da expressão genética, ou a libertação de hormonas ou neurotransmissores. (pt)
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rdfs:comment 전압 개폐 칼슘 통로(VDCC,Voltage-gated calcium channel)는 세포막에 존재하면서 막 전압에 따라 열리고 닫히면서 칼슘을 통과시키는 막 단백질이다. 신경세포, 근육세포, 등 흥분성세포의 막에 주로 존재하면서 신경세포에서는 신경전달물질의 분비를, 근육세포에서는 세포의 수축을, 에서는 분비를 일으킨다. (ko) 電位依存性カルシウムチャネル(でんいいぞんせいカルシウムチャネル、英: voltage-gated calcium channel(VGCC)、voltage-dependent calcium channel(VDCC))はカルシウムイオン(Ca2+)透過性を有するカルシウムチャネルの一種で、電位依存性イオンチャネルのグループで、興奮性細胞(筋肉、グリア細胞、神経細胞など)の膜に存在する。VGCCはわずかにナトリウムイオン(Na+)も透過させるためCa2+-Na+チャネルとも呼ばれるが、生理的条件下ではカルシウムの透過性はナトリウムよりも約1000倍高い。生理的な静止膜電位下では、通常VGCCは閉じている。膜電位の脱分極によって活性化される(開く)ため、「電位依存性」という名称がついている。通常、細胞外のCa2+の濃度は細胞内よりも数千倍高いため、VGCCの活性化によってCa2+が細胞へ流入し、細胞種によってカルシウム感受性カリウムチャネルの活性化、筋収縮、神経の興奮、遺伝子発現のアップレギュレーション、ホルモンや神経伝達物質の放出などが引き起こされる。VGCCは正常なもしくは過形成をきたした副腎の球状層(zona glomerulosa)とアルドステロン産生腺腫に局在しており、後者においてはT型VGCCのレベルは患者の血漿アルドステロンレベルと相関している。VGCCの過剰の活性化は興奮毒性の主要な要素であり、細胞内のカルシウムレベルの過度な上昇によって細胞構造を分解する酵素群が活性化される。 (ja) Canais de cálcio dependentes de voltagem são um grupo de canais iónicos dependentes de voltagem encontrados em células excitáveis (músculo, células da glia, neurónios, etc.) com permeabilidade para o ion Ca2+. Em potencial de membrana em repouso, estes canais estão normalmente fechados. São activados com membrana despolarizada. A activação de canais de cálcio dependentes de voltagem particulares permite que o cálcio entre na célula, o que dependendo do tipo de célula, resulta em contração muscular, excitação de neurónios, regulação da expressão genética, ou a libertação de hormonas ou neurotransmissores. (pt) Voltage-gated calcium channels (VGCCs), also known as voltage-dependent calcium channels (VDCCs), are a group of voltage-gated ion channels found in the membrane of excitable cells (e.g., muscle, glial cells, neurons, etc.) with a permeability to the calcium ion Ca2+. These channels are slightly permeable to sodium ions, so they are also called Ca2+-Na+ channels, but their permeability to calcium is about 1000-fold greater than to sodium under normal physiological conditions. (en)
rdfs:label 전압 개폐 칼슘 통로 (ko) 電位依存性カルシウムチャネル (ja) Canal de cálcio dependente de voltagem (pt) Voltage-gated calcium channel (en)
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