血管内皮細胞のフロー依存性サイトゾール酸性酸化
R C Ziegelstein1, L Cheng, M C Capogrossi
1Laboratory of Cardiovascular Science, National Institute on Aging, National Institutes of Health, Baltimore, MD 21224.
まとめ
ラット大動脈内皮細胞の細胞溶液 pH を迅速に低下させる. これは,塩化水素と塩化ビカルボネートイオン交換器の両方の活性化によって発生し,細胞機能に影響を与えます.
科学分野:
- 生理学 生理学とは
- 細胞生物学 細胞生物学
- バイオケミストリー バイオケミストリー
背景:
- ヘモダイナミック・シーア・ストレスは,内皮細胞の構造と機能に影響を与えます.
- これらの効果の根底にある信号伝達メカニズムは完全に理解されていません.
研究 の 目的:
- ラットの大動脈内皮細胞における細胞塩分pH (pHi) に対するラミナルシーアストレスの影響を調査する.
- シャーストレスの誘発によるpHi変化に関与するイオン交換メカニズムを解明する.
主な方法:
- ガラスの毛細血管管に培養されたラットの大動脈内皮細胞.
- 適用されたラミナーシーアーストレスと,細胞塩基 pH の変化を測定した.
- イオン輸送経路を特定するためにイオン除去および交換阻害剤を使用しました.
主要な成果:
- 層切断ストレスはpHiの急速な低下を引き起こし,最大効果は13.4ダイネ/cm2.4でpH単位0.09であった.
- 切断ストレスは,塩化塩酸ビカルボネートイオン交換 (アルカリエクストルーダー) とナトリウム-水素イオン交換 (酸エクストルーダー) の両方を活性化しました.
- ビカルボネートによる生理学的バッファーの純効果は,pHi.の減少でした.
結論:
- ヘモダイナミック・シーア・ストレスは,アルカリと酸のエクストルーダーを協調的に活性化することによって,内皮細胞のpHiを調節する.
- これらのイオン輸送機構は,切断ストレス下での内皮細胞機能を調節するために重要である.
- これらの経路を理解することで,血管内皮におけるメカニカル伝導の洞察が得られます.
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