ゴッシャー病のグルコセレブロシダゼとα-シヌクレインは,シヌクレイン病変において双方向の病原性ループを形成する
Joseph R Mazzulli1, You-Hai Xu, Ying Sun
1Department of Neurology, Massachusetts General Hospital, Harvard Medical School, MassGeneral Institute for Neurodegenerative Disease, Charlestown, MA 02129, USA.
Cell
|June 25, 2011
まとめ
パーキンソン病は,グルコセレブロシダゼ (GCase) によるゴーシャー病と関連している. GCaseの機能の喪失はタンパク質の分解を阻害し,アルファ-シヌクレインの蓄積と神経毒性を引き起こし,共通の疾患メカニズムを示唆します.
科学分野:
- 神経変性疾患は,神経変性疾患である.
- リソソーム貯蔵障害 リソソーム貯蔵障害
- 神経毒性の分子メカニズム
背景:
- パーキンソン病 (PD) は,成人における神経変性疾患である.
- PDとGaucher病 (GD),リソソーム貯蔵障害の間の臨床的リンクが存在する.
- PDとGDのメカニズム的な関連は不明である.
研究 の 目的:
- ゴーシャー病に関連したグルコセブレブロシダゼ (GCase) とパーキンソン病の病原性とのメカニズム的関連を調べる.
- アルファ-シヌクレイン (α-syn) アグリゲーションと神経毒性におけるGCASE機能障害の役割を明らかにする.
主な方法:
- プライマリニューロン培養とヒト誘発型多能幹細胞 (iPS) によるニューロンを利用した.
- ライソソームタンパク質の分解経路を評価した.
- グルコシルセラミド (GlcCer) がα-シンアミロイド形成に及ぼす影響を調査した.
- イディオパシーPDの脳組織におけるGCaseの活性を調べた.
主要な成果:
- GCaseの機能的喪失は,ライソソームタンパク質の分解を危うくした.
- GCase欠乏はα-synの蓄積と集積依存神経毒性をもたらした.
- GCase基質であるGlcCerはα-syn オリゴメリック中間体を安定させ,アミロイド形成を促進した.
- α-synは,ニューロンとPDの脳組織における正常なGCase活性を抑制することが判明しました.
結論:
- α-synとGCaseの間に双方向フィードバックループが存在し,潜在的に疾患の自己拡散を推進します.
- GCaseの枯渇は,散発性シヌクレイン病変の病原化に寄与する.
- リソソームへのGCase伝達をターゲットにすることは,PDおよび他のシヌクレイン病変に対する特定の治療戦略を提供することができる.
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