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脳内のアミロイドβ-ペプチドの濃度上昇と認知機能低下との関連
J Näslund1, V Haroutunian, R Mohs
1Laboratory of Molecular and Cellular Neuroscience, Rockefeller University, New York, NY, USA.
JAMA
|March 29, 2000
まとめ
アルツハイマー病 (AD) は,認知機能低下と相関するアミロイドβ-ペプチド (Abeta) の蓄積を伴う. アベタレベルは,タウ病変の発生前に,早期に上昇し,アベタを標的としたAD治療をサポートします.
科学分野:
- 神経科学は神経科学である.
- 神経病理学 神経病理学
- ゲロントロジーはゲロントロジーの学科です.
背景:
- アルツハイマー病 (AD) は神経病理学的に,アミロイドβ-ペプチド (Abeta) プラークとタウ・タングルによって定義されています.
- AD研究における重要な議論は,アベタ蓄積と認知症の重度との相関,そしてアベタとタウ病変の間の時間的関係に関するものである.
研究 の 目的:
- アベタ蓄積と認知機能の低下の最も初期の指標との相関性を調査する.
- アベタ蓄積の進行とタウタンパク質の初期の変化の関係を解明する.
主な方法:
- 79人の介護老人ホームの住人を対象とした死後の横断研究で,さまざまな臨床認知症評価 (CDR) スコア (0.0-5.0) を取得しました.
- 5つの脳新皮質領域におけるアベタペプチド変種 (A(beta) x-40およびA(beta) x-42) の定量化.
- 前頭皮質における初期のタウタンパク質の構造変化の評価,CDRスコアと相関する.
主要な成果:
- A[β]x-40とA[β]x-42の両方のレベルが上昇したのは,認知症が疑わしい個体でも観察されました (CDR 0.5).
- 両方のアベタペプチドの増加は,認知症の重度の進行と強く相関しています.
- A(β) x-42レベルは,認知症のない個体でもA(β) x-40よりも一貫して高く,このパターンは疾患の進行中に持続しました.
- 重要なのは,A (β) x-40とA (β) x-42の上昇が,前頭皮質における有意なタウ病理に先行することが判明したことです.
結論:
- アベタペプチドのレベル (A(β) x-40およびA(β) x-42) は,認知症の進行初期に上昇し,アルツハイマー病の認知機能低下と強く相関しています.
- アベータの蓄積は,前頭皮質における有意なタウ病理に先行し,ADの病原化を開始するアベータの主要な役割を支持する.
- これらの発見は,潜在的なAD治療のためにアベタ形成,蓄積,またはその細胞毒性効果を標的とした治療戦略を提唱しています.
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