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HSF-1媒介の細胞骨格の整合性は,熱耐性と寿命を決定する

Nathan A Baird¹, Peter M Douglas¹, Milos S Simic¹

¹Howard Hughes Medical Institute, University of California Berkeley, Berkeley, CA 94720, USA.

Science (New York, N.Y.)

|October 18, 2014

まとめ

熱ショック転写因子-1 (HSF-1) は,細胞のストレス抵抗性と長寿を調節する. 改変されたHSF-1菌株は,PAT-10経由でアクチン細胞骨格に影響を及ぼし,シャパロンを増やさずにストレス耐性を高め,寿命を延ばします.

科学分野:

細胞生物学細胞生物学
遺伝学遺伝学とは
老化に関する研究.

背景:

熱ショック転写因子-1 (HSF-1) は,細胞のストレス耐性と長寿に不可欠です.
HSF-1は通常,分子チャペロンの遺伝子を制御し,ストレスや老化からタンパク質を保護します.
HSF-1が長寿に影響する正確なメカニズムは,シェパロン規制を超えて完全に理解されていません.

研究の目的:

ストレス耐性および長寿を調節するHSF-1の新しいメカニズムを調査する.
チャペロン誘導から独立して細胞の完全性を維持するHSF-1の役割を調査する.
健康保証に関わるHSF-1のダウンストリームターゲットを特定する.

主な方法:

熱ショック転写因子-1 (HSF-1) の改変株をCaenorhabditis elegansで設計する.
ストレス反応と細胞骨格の完全性に関連した遺伝子発現とタンパク質機能の分析.
ストレス耐性,熱耐性,寿命のフェノタイプ分析.

主要な成果:

改変されたHSF-1菌株は,ストレス耐性および長寿が増加し,シェーパロンレベルが上昇しなかった.
この効果は,カルシウム結合タンパク質 PAT-10によって媒介された.
pat-10の喪失は,アクチン細胞骨格の崩壊,ストレス抵抗性の低下,寿命の短縮につながった.
pat-10の過剰発現は,アクチンフィラメントの安定性,耐熱性,長寿性を高めました.

結論:

HSF-1は,細胞骨格の整合性,特にアクチン細胞骨格の維持に重要な役割を果たします.
HSF-1-PAT-10経路は,ストレスや老化時に細胞機能に不可欠です.
HSF-1の長寿への影響は,シャパロン調節を超えて,細胞骨格の安定性を含む.

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