プロリルイソメラーゼPin1は,アミロイド前駆タンパク質の加工とアミロイドベータの生産を調節する
Lucia Pastorino1, Anyang Sun, Pei-Jung Lu
1Cancer Biology Program, Department of Medicine, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, Massachusetts 02215, USA.
Nature
|March 24, 2006
まとめ
Pin1プロリルイソメラーゼは,アミロイド前駆タンパク質 (APP) の加工とアミロイドベータ (Abeta) の生産を調節する. Pin1の緩和は,毒性の高いAbeta42を増加させ,アルツハイマー病におけるtauとAbetaの病理を結びつける.
科学分野:
- 神経科学は神経科学である.
- 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:
- アルツハイマー病 (AD) は,神経線維の絡み (tau) とアミロイドプラーク (アミロイドベータ,アベータ) が特徴です.
- アルツハイマー病の病原性におけるタウとアベタの関係性は完全に理解されていません.
- プロリルイソメラーゼであるPin1は,タンパク質構成を調節し,ADの病原化に関与しています.
研究 の 目的:
- アミロイド前駆タンパク質 (APP) の加工とアベタ生産におけるPin1の役割を調査する.
- Pin1がAPP細胞内領域 (AICD) の構成に影響を与えるメカニズムを解明する.
- アルツハイマー病のモデルにおけるPin1媒介調節の病理学的意義を決定する.
主な方法:
- 核磁共振 (NMR) スペクトロスコーピーは,AICDの形状を視覚化します.
- アベタ分泌を評価するための細胞培養実験.
- Pin1ノックアウトおよび/または変異したAPP過剰発現のマウスモデル.
- 免疫ヒストケミストリーは,Abeta42を脳内で特定する.
主要な成果:
- Pin1はAPPのリン酸化されたThr668-Proモチーフと結合し,AICDの異体化を1000倍以上加速する.
- Pin1の過剰発現はアベタ分泌を減少させ,Pin1のノックアウトはそれを増加させる.
- マウスにおけるPin1ノックアウトは,アミロイド原性APP処理と不溶性Abeta42を年齢に応じて上昇させる.
結論:
- ピン1触媒によるプロリルイソメリゼーションは,APP処理とアベタ生産のための新しい規制メカニズムです.
- Pin1活動の緩和は,アルツハイマー病におけるタウとアベタ病理を結びつける可能性がある.
- Pin1をターゲットにすることは,アルツハイマー病に対する潜在的な治療戦略を提供します.
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