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自閉症に関連する赤字は,eIF4Eに依存した変調された翻訳制御によるものです
Christos G Gkogkas1, Arkady Khoutorsky, Israeli Ran
1Department of Biochemistry & Goodman Cancer Research Centre, McGill University, Montreal, Quebec H3A 1A3, Canada.
Nature
|November 23, 2012
まとめ
ユカリオット翻訳開始因子4E結合タンパク質2 (4E-BP2) の失調は,神経リジン合成に影響を与え,シナプス刺激抑制バランスを変化させることで,自閉症スペクトル障害 (ASD) の現象型に寄与します.
科学分野:
- 神経科学は神経科学である.
- 遺伝学 遺伝学とは
- 分子生物学は分子生物学である.
背景:
- 自閉症スペクトル障害 (ASD) は,ニューロンのハイパー接続性とシナプスタンパク質合成の増加に関連しています.
- ラパミシン (mTOR) 経路の哺乳類の標的はASDに関与しているが,その下流の翻訳制御機構は不明である.
研究 の 目的:
- mTORのダウンストリーム抑制体であるエウカリオット翻訳開始因子4E結合タンパク質2 (4E-BP2) のシナプス機能と自閉症行動の調節における役割を調査する.
- 神経リンゴの翻訳制御機構,ASDに関連したポストシナプスタンパク質を明らかにする.
主な方法:
- 4E-BP2遺伝子 (Eif4ebp2) を欠いたノックアウトマウスを生成した.
- 4E-BP2ノックアウトと真核細胞の翻訳開始因子4E (eIF4E) の過剰発現が神経リジン翻訳に及ぼす影響を調べました.
- マウスにおけるシナプス刺激と抑制の比率と自閉症のような行動の評価.
- eIF4Eの薬理学的阻害と神経リギンタンパク質濃度の正常化を活用した.
主要な成果:
- 4E-BP2の喪失またはeIF4Eの過剰発現は,神経リンリンスレーションを増加させる.
- Eif4ebp2のノックアウトマウスは,興奮/阻害シナプス入力比率が高くなり,自閉症のような行動を示した.
- eIF4Eの薬理学的阻害またはニューロリギン1の正常化により,興奮-阻害バランスと社会的行動が回復しました.
結論:
- eIF4Eとその抑制剤4E-BP2によって媒介される翻訳制御は,神経リンリン合成の調節に極めて重要です.
- この経路の調節不良は,脳の興奮抑制バランスを乱し,ASDのような現象型につながります.
- eIF4Eの活性や特定の神経リギンのレベルをターゲットにすることで,ASDの治療戦略を提供することができます.
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