成熟したB細胞をT細胞に変容させ,非コミットドプロゲンテータへの脱差別化を行う
César Cobaleda1, Wolfram Jochum, Meinrad Busslinger
1Research Institute of Molecular Pathology, Vienna Biocenter, Dr. Bohr-Gasse 7, A-1030 Vienna, Austria.
Nature
|September 14, 2007
まとめ
成熟したB細胞は,Pax5遺伝子が削除され,T細胞の発達を救出し,リンパ腫を誘発する可能性があるため,未結合の原始細胞に戻ることができます. これは,微分化した細胞の意外な可塑性を明らかにします.
科学分野:
- 免疫学 免疫学とは
- 発達生物学 発達生物学について
- 癌生物学 癌生物学について
背景:
- 細胞の微分化は,典型的には一方的であり,不可逆的である.
- 転写因子Pax5は,B細胞系統のコミットメントと成熟に不可欠です.
- 成熟したB細胞は通常,辺縁リンパ性臓器に存在します.
研究 の 目的:
- 成熟したB細胞の可塑性を研究するために.
- B細胞の同一性を維持するPax5の役割を決定する.
- 成熟したB細胞におけるPax5喪失の影響を調査する.
主な方法:
- マウスの成熟したB細胞におけるPax5遺伝子の条件付き削除.
- B細胞の分化状態と系統逆転の可能性の評価.
- T細胞欠乏マウスにおけるT細胞発育救済の分析.
- その結果生じるリンパ腫の遺伝子発現プロファイリング.
主要な成果:
- 条件付きのPax5の削除により,成熟したB細胞が非コミットドプロジェンタに分化することを誘発した.
- これらの分化されていない細胞は,T細胞欠乏したマウスのT細胞リンパポエーシスを回復させることができる.
- B細胞から派生したTリンパ球は,免疫反応において機能的であった.
- 成熟したB細胞におけるPax5の喪失は,原始細胞腫瘍に似た攻撃的なリンパ腫を引き起こした.
結論:
- 成熟したB細胞は,驚くべき可塑性を持ち,Pax5の喪失で分化することが可能である.
- Pax5は,Bリンパ球の分化状態を維持するために不可欠です.
- 完全なPax5喪失は,成熟したB細胞からリンパ腫の発症を開始する可能性があります.
- この研究は,免疫系における不可逆的な末端分化という概念に異議を唱える.
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