造血幹細胞の到着は,周血管ニッチのダイナミックな改造を誘発する
Owen J Tamplin1, Ellen M Durand2, Logan A Carr1
1Stem Cell Program and Division of Hematology/Oncology, Boston Children's Hospital and Dana Farber Cancer Institute, Howard Hughes Medical Institute, Harvard Stem Cell Institute, Harvard Medical School, Boston, MA 02115, USA.
Cell
|January 17, 2015
まとめ
研究者は,ゼブラフィッシュの血液形成性幹細胞と原始細胞 (HSPC) を視覚化して,ダイナミックなニッチ相互作用を明らかにしました. 彼らは,内皮細胞がHSPCの周りにポケットを形成し,メゼンキマル・ストロマル細胞がそれを固定し,方向づけし,幹細胞プールを拡大することを発見しました.
科学分野:
- 発達生物学 発達生物学とは
- ヘマトポエーシス (血液形成) とは
- 幹細胞生物学 幹細胞生物学とは
背景:
- 造血幹細胞と原始細胞 (HSPCs) は,血液システムの再生に不可欠です.
- 内生性HSPCをインビヴォ,特に哺乳類で視覚化することは,依然として困難です.
研究 の 目的:
- ゼブラフィッシュの内生HSPCを検出するための高解像度ライブ画像システムを開発する.
- 個々のHSPCとそのニッチ間のダイナミックな相互作用を調査する.
主な方法:
- ゼブラフィッシュにおける特定のトランスジェニックHSPCレポーターの生成.
- 固有のHSPCsの高解像度ライブイメージング.
- 相対的な光と電子顕微鏡.
- 化学遺伝子スクリーニング.
主要な成果:
- 固体内皮細胞が改造してHSPCの周りのポケットを形成する独特の周周血管ニッチ相互作用を特定しました.
- 観察されたメゼンキマ・ストロマル細胞がHSPCを固定し,その細胞分裂を指向する.
- 発見されたリコリンは,HSPC-ニッチの相互作用を促進し,成人の幹細胞のプールを拡大します.
結論:
- ゼブラフィッシュは,ダイナミックな幹細胞のニッチ相互作用を研究するための強力なモデルを提供します.
- 内皮細胞と中皮細胞のストロマ細胞は,HSPCのニッチを積極的に形作っています.
- ライコリンは,幹細胞の集団を拡大するための治療的可能性を持っています.
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