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Updated: Jul 10, 2026

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Activation of Apoptosis by Cytoplasmic Microinjection of Cytochrome c
Published on: June 29, 2011
サイトゾール熱ショックタンパク質60は,ヒポキシアとアポトシスによる死滅を引き起こします
1Baylor College of Medicine and the VA Medical Center, Houston, Tex, USA.
Circulation
|November 20, 2002
まとめ
低酸素症は熱ショックタンパク質60 (HSP60) がバックスから分離し,バックスがミトコンドリアに移動し,アポトーシスを引き起こすようにします. この解離は,酸素不足中に細胞死亡の鍵です.
科学分野:
- 細胞生物学 細胞生物学
- 分子生物学は分子生物学である.
- バイオケミストリー バイオケミストリー
背景:
- 熱ショックタンパク質60 (HSP60) は主にミトコンドリアですが,サイトゾールにも存在します.
- HSP60は通常,サイトゾール内のバックスと複合し,ミトコンドリアとアポトーシスへのバックス転移を阻害します.
- 低酸素/低酸素化はHSP60を減少させ,バックス転位とシトクロームcの放出を促進すると仮定された.
研究 の 目的:
- ヒポキシア/レオキシゲネーション中のアポトーシスにおけるHSP60の役割を調査する.
- HSP60の還元がバックス転位とシトクロームcの放出を早めるかどうかを判断する.
- 低毒性条件下でのHSP60-bax相互作用のメカニズムを解明する.
主な方法:
- 成人ラットの心筋細胞は,低酸素化と再酸素化を受けた.
- HSP60,HSP72,bax,bcl-2のレベルを測定した.
- タンパク質の局所化と相互作用を分析するために,細胞分化と共免疫降低が使用されました.
- サイトクロームcの放出を評価した.
主要な成果:
- リオキシゲネーション中にHSP60レベルが低下し,HSP72レベルが上昇した.
- バックスとbcl-2レベルは,リオキシゲネーション中に減少した.
- サイトクロームcの放出は,リオキシゲネーションに先立つ末期低酸素症で発生しました.
- 低酸素症は,HSP60-バックス複合体の解離を引き起こし,細胞性HSP60は血に転移し,バックスはミトコンドリアに転移した.
結論:
- 低酸素症は,HSP60-bax複合体の解離を誘導する.
- 細胞性HSP60がプラズマ膜に転移し,バックスがミトコンドリアに転移すると,アポトーシスが生じます.
- このHSP60-bax複合体の解離は,プログラム細胞死を開始するのに十分です.
関連する概念動画
Apoptosis
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Caspases
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