阻害性インターニューロン欠乏症は,アルツハイマー病モデルにおけるネットワーク活動の変化と認知機能障害を関連付けています
Laure Verret1, Edward O Mann, Giao B Hang
1Gladstone Institute of Neurological Disease, San Francisco, CA 94158, USA.
Cell
|May 1, 2012
まとめ
減少したNav1.1レベルは,パルバルブミン細胞を損なっており,アルツハイマー病のモデルではネットワーク機能障害と記憶喪失を引き起こす. Nav1.1の機能を復元すると,これらのアルツハイマー病の欠陥が改善されます.
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.
- 遺伝学 遺伝学とは
背景:
- アルツハイマー病 (AD) は,認知機能の低下と脳のネットワーク活動の変化によって特徴付けられます.
- ADにおけるこれらのネットワーク変化を駆動する根本的なメカニズムは,依然としてほとんど不明である.
- ヒトアミロイド前駆体タンパク質 (hAPP) トランスジェニックマウスは,AD関連の病理学の研究のモデルとなる.
研究 の 目的:
- アルツハイマー病の病原性におけるネットワーク機能障害とパルバルブミン (PV) 細胞の役割を調査する.
- AD.におけるPV細胞機能に対する電圧誘導ナトリウムチャネルサブユニットNav1.1の貢献を検証する.
- ネズミのモデルで,Nav1.1レベルを回復することで,ADのような症状を緩和できるかどうかを判断する.
主な方法:
- 電気脳波 (EEG) 記録は,hAPP トランスジェニックマウスで行われました.
- ナトリウムチャネルサブユニットであるNav1.1のレベルは,hAPPマウスとヒトAD患者で測定されました.
- Nav1.1-BACを用いてhAPPマウスでNav1.1の発現を回復させ,機能回復を評価した.
主要な成果:
- hAPPマウスは,ネットワークハイパーシンクロニーを示す自発的なエピレプティフォームド放電とガマ振動の減少を示した.
- Nav1.1の濃度の低下は,hAPPマウスとAD患者,特にPV細胞で観察されました.
- hAPPマウスにおけるNav1.1の回復により,阻害性シナプス活性,ガンマ振動が正常化し,超同期性,記憶障害,死亡率が低下した.
結論:
- Nav1.1レベルが低下し,その後のPV細胞機能不全は,ADにおける異常なネットワーク活動に重大な貢献者である.
- PV細胞機能の障害とネットワークの同期性は,ADモデルにおける記憶障害と死亡率と相関しています.
- Nav1.1をターゲットにすることで,アルツハイマー病の治療戦略を提供することができる.
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