単細胞解像度における骨髄の微環境
Anastasia N Tikhonova1,2, Igor Dolgalev3,4,5, Hai Hu3,4
1Department of Pathology, NYU School of Medicine, New York, NY, USA. Anastasia.Tikhonova@nyumc.org.
Nature
|April 12, 2019
まとめ
この研究では,マウスの骨髄細胞を単細胞解像度でマッピングし,血液細胞形成 (血液形成) を調節する複雑な細胞相互作用を明らかにした. ストレスは この微小環境を大きく変えて 幹細胞の発達に影響します
科学分野:
- 血液学
- 幹細胞生物学
- 分子生物学
背景:
- 骨髄の微小環境は血液形成の調節に不可欠ですが,その分子的複雑性とストレスへの反応は十分に理解されていません.
- 骨髄のニッチの細胞と分子ダイナミクスを理解することは,血液細胞形成プロセスを解読するために不可欠です.
研究 の 目的:
- 単細胞解像度でマウスの骨髄血管,周血管,骨芽細胞群の転写図を描画する.
- これらの細胞集団がホメオスタシスとストレス誘発の血液形成に転写的にどのように反応するかを調査する.
- 重要な調節因子の細胞源を特定し,血液形成におけるその役割を理解する.
主な方法:
- 単細胞RNAシーケンシング (scRNA-seq) を用いて,転写プロフィールを分析した.
- 比較分析は,ホメオスタティック状態とストレス状態の骨髄細胞で行われました.
- 骨髄のニッチ内の血管,周周血管,骨芽細胞の集団に焦点を当てます.
主要な成果:
- 骨髄のニッチで 細胞の異質性を明らかにした
- 特定細胞集団を血球形成因子の源として特定した.
- ストレス下でのニッチ要素の実質的な転写再構成が示され,周周細胞の脂肪細胞性歪みが含まれています.
- ストレス下での血管のノッチ・デルタ型リガンド (Dll1とDll4) のダウンレギュレーションを観察した.
- 血管のDll4が欠けると 早期の骨髄分化が生じることが分かりました
結論:
- 骨髄のニッチの細胞構造と分子景観の理解を深めた
- ストレスに敏感なニッチのダイナミックで異質な性質を強調しました.
- 単細胞トランスクリプトミクスの有用性を示し,離散的なニッチ集団による血液形成の調節を解剖した.
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