メゼンキマと血液形成性幹細胞は,骨髄のユニークなニッチを形成する
Simón Méndez-Ferrer1, Tatyana V Michurina, Francesca Ferraro
1Department of Medicine, Mount Sinai School of Medicine, New York, New York 10029, USA. simon.mendez-ferrer@cnic.es
Nature
|August 13, 2010
まとめ
ネスティン発現によって識別されるメゼンキマル幹細胞 (MSC) は,血液形成性幹細胞 (HSC) のニッチにとって極めて重要です. これらの nestin (((+) MSCは,骨髄微環境内のHSCの維持と帰着をサポートします.
科学分野:
- 血液学 ヘマトロジ
- 幹細胞生物学 幹細胞生物学
- 骨髄マイクロ環境の研究
背景:
- 骨髄における血液形成性幹細胞 (HSC) のニッチの正確な細胞組成は,まだ完全に理解されていない.
- 以前の研究では,骨質芽細胞,内皮細胞,および血管周細胞がHSCのニッチ機能に関与している.
研究 の 目的:
- 血液形成幹細胞のニッチを維持するために不可欠な特定の細胞タイプを特定し,特徴づけること.
- 骨髄内のメゼンキマル幹細胞 (MSC) と血液形成性幹細胞 (HSC) の機能的関係を解明する.
主な方法:
- ネスティン発現をマーカーとして使用したメゼンキマル幹細胞 (MSC) の識別.
- nestin (((+) MSCsの増殖は,自己再生および連続移植アッセイのための非粘着性"メゾン球"として.
- nestin (((+) MSCsとHSCsの空間的関連性の評価,HSCの維持と骨質芽細胞の分化マーカーの遺伝子発現分析.
- nestin (((+) 細胞集団のインビボ操作とHSCの含有量,動員,帰還の評価.
主要な成果:
- Nestin (((+) MSCは,すべての骨髄コロニーを形成するユニットの線維芽細胞活性を持つHSCニッチの重要な構成要素として特定されました.
- Nestin (((+) MSCは,HSCとアドレナージ神経繊維と空間的に結びつき,HSCのキーメンテナンス遺伝子を発現します.
- HSC維持遺伝子と骨質芽細胞分化遺伝子は,強制的なHSC動員またはβ3アドレノ受容体の活性化中にダウンレギュレーションされた.
- パラホルモンの投与は,ネスティン (((+) 細胞を増やし,それらの骨芽細胞の分化を促進し,ネスティン (((+) 細胞の減少は,骨髄のHSC含有量を急速に減少させた.
- 精製されたHSCは,好ましくは,nestin (((+) MSCの近くにホーミングされ,nestin (((+) 細胞枯渇により,骨髄にホーミングする血液生成原始細胞が損なわれています.
結論:
- ネスティン発現によって識別されるメゼンキマ性幹細胞 (MSC) は,血液形成性幹細胞 (HSC) のニッチの重要な構成要素である.
- この研究は,ネスティン (((+) MSCsとHSCsの間の新しいパートナーシップを明らかにし,骨髄のニッチ内で異型幹細胞のペアを形成します.
- これらの発見は,HSCと血液形成原始細胞の行動のユニークな微環境的調節に関する新しい洞察を提供します.
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