Ars2は,Sox2の直接の転写的活性化により,ニューラル幹細胞の同一性を維持する
Celia Andreu-Agullo1, Thomas Maurin, Craig B Thompson
1Department of Developmental Biology, Sloan-Kettering Institute, 1275 York Avenue, Box 252, New York, New York 10065, USA. andreuac@mskcc.org
Nature
|December 27, 2011
まとめ
亜鉛指タンパク質Ars2 (アルセニート抵抗タンパク質2) は,神経幹細胞 (NSC) の自己再生とアイデンティティに不可欠です. Ars2はSOx2の発現を直接活性化し,NSCの多能原始状態を維持する.
科学分野:
- 神経科学は神経科学である.
- 幹細胞生物学 幹細胞生物学
- 分子生物学は分子生物学である.
背景:
- 神経幹細胞 (NSC) は自己再生能力と神経生成能力を有しているが,それらを制御する転写ネットワークは不明である.
- Ars2 (アルセナイト耐性タンパク質2) は,マイクロRNA生物発生における役割が知られている亜鉛指タンパク質です.
- 大人の神経幹細胞のアイデンティティと自己更新におけるArs2の機能は十分に理解されていません.
研究 の 目的:
- 大人の神経幹細胞の自己再生とアイデンティティにおけるArs2の役割を調査する.
- Ars2が神経幹細胞の機能を調節する分子機構を特定する.
主な方法:
- 大人の腹腔下部ゾーン (SVZ) のグリアル線維酸性タンパク質発現細胞におけるArs2の選択的ノックダウン.
- hGFAP-cre::Ars2(fl/fl) の条件付きノックアウトマウスの生成.
- NSCの自己再生と神経原性能力を評価するためのex vivoアッセイ.
- クロマチン免疫プレシピテーションとゲルシフト分析により,Ars2結合部位を特定する.
- Ars2-不足のNSCにおけるSox2表現と機能の評価.
主要な成果:
- 成人 SVZ NSCにおけるArs2のノックダウンにより,NSCの数と神経発生能力が低下した.
- マウスにおけるArs2の条件付きノックアウトは,これらの現象型を再現し,悪化させた.
- Ars2は,RNAから独立した方法で,Sox2遺伝子の特定の強化領域に直接結合する.
- Ars2は,NSCの自己再生と多能性にとって不可欠なSox2発現を正に調節する.
- Ars2は,マイクロRNA生物発生における既知の役割とは無関係にNSCの自己更新を促進する.
結論:
- Ars2は,神経幹細胞の多能原始体状態を維持するために不可欠な新しい転写因子です.
- Ars2はSox2の発現を直接活性化し,NSCのアイデンティティと自己更新を制御する.
- これらの発見は,ニューラル幹細胞の維持とニューロゲネシスのための新しい規制メカニズムを明らかにします.
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