MafBは,血液生成幹細胞のM-CSFに依存する筋膜結束分裂を制限する
Sandrine Sarrazin1, Noushine Mossadegh-Keller, Taro Fukao
1Centre d'Immunologie de Marseille-Luminy, Université Aix-Marseille, Campus de Luminy, Case 906, 13288 Marseille Cedex 09, France.
Cell
|July 28, 2009
まとめ
転写因子MafBは,血液形成性幹細胞 (HSC) の分裂を制御し,特に骨髄系統へのコミットメントを制限する. MafB欠乏症は,M-CSFに対するHSCの感受性を高め,骨髄単細胞の再生を促進します.
科学分野:
- 血液学 ヘマトロジ
- 幹細胞生物学 幹細胞生物学
- 分子生物学は分子生物学である.
背景:
- 造血幹細胞 (HSC) の自己再生は,血液細胞の集団を維持するために極めて重要です.
- 特定の血統バイアスにつながるHSCの分割を制御するメカニズムは,完全に理解されていません.
研究 の 目的:
- HSC系統のコミットメントを調節するトランスクリプション因子MafBの役割を調査する.
- MafBがM-CSFに対するHSC反応と骨髄膜分化にどのように影響するかを決定する.
主な方法:
- MafB欠乏したマウスを用いたin vivo研究.
- M-CSFとPU.1の活性化に対するHSC感受性の分析.
- HSC分裂パターンの単細胞分析.
- 競争的再定住は,系統バイアスを評価するためのアッセイである.
主要な成果:
- MafB欠乏症は,特にM-CSFに対するHSCの感受性を高め,骨髄性結合を促進します.
- MafB欠乏症は,HSCにおけるPU.1の活性化につながり,骨髄単細胞系を好む.
- 単細胞分析は,M-CSFがMafB欠乏性HSCの非対称的な分裂を誘導することを示しています.
- MafB(-/-) HSCは,骨髄単細胞区内の長期にわたる,連続移植可能な再定植の利点を示しています.
結論:
- 統合された転写因子 (MafB) /サイトカイン (M-CSF) 回路は,HSCの特定のコミットメント部門を制御します.
- MafBは,M-CSF駆動の骨髄膜結合の特定の制限点として機能します.
- この制御回路は,自己更新または他の系統を損なうことなく,系統特有のHSC分割制御を可能にします.
関連する概念動画
Multipotency of Hematopoietic Stem Cells
The hematopoietic stem cells or HSCs are multipotent, meaning they can differentiate and give rise to all blood and immune cells. HSCs are maintained in the quiescent stage until an external stimulus initiates their differentiation. The multipotent HSCs exist as two heterogeneous populations, long-term repopulating cells (LTRC) and short-term repopulating cells (STRC). The two HSC populations have different surface markers or receptors and are classified based on quiescence and long-term...
Lineage Commitment
Commitment is the process whereby stem cells:
Differentiation of Common Myeloid Progenitor Cells
Common myeloid progenitors (CMPs) are oligopotent cells that can differentiate into granulocytes and macrophages. Granulocytes and macrophages are essential for protecting the body against bacterial, viral, or fungal infections. They migrate from the bone marrow into the circulating blood to reach specific tissue sites where they differentiate and help in immune surveillance. However, they survive only for a few days and must be continuously made available to the organism to maintain a robust...
Regulation of Hematopoietic Stem Cells
All blood and immune cells are produced from the multipotent hematopoietic stem cells (HSCs) by the process of hematopoiesis. However, they all have a limited life span. In addition, many are depleted in immune surveillance or combatting an injury or infection. This makes blood one of the most regenerative tissues. Hematopoiesis helps replenish these blood and immune cells, restoring the body's normal functioning. However, overproduction of blood and immune cells can make them cancerous or...
Mesenchymal Stem Cells
Mesenchymal stem cells (MSCs) are adult stem cells that can differentiate into most connective tissue cell types, except for hematopoietic cells, depending upon the source of MSCs. For example, bone-marrow-derived MSCs (BM-MSCs) can differentiate into osteocytes, hepatocytes, and pancreatic and neuronal cells. MSCs can be isolated from various sources such as bone marrow, placenta, adipose tissue, teeth, and Wharton’s jelly, a gelatinous substance in the umbilical cord. The ease of their access...


