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成長と免疫グロブリンV (D) J再結合におけるKu80の必要性

A Nussenzweig1, C Chen, V da Costa Soares

  • 1Department of Medical Physics, Memorial Sloan-Kettering Cancer Centre, New York 10021, USA.

Nature
|August 8, 1996
PubMed

Insights

DNA結合タンパク質Ku80は,リンパ球におけるDNA修復とV(D) J再結合に不可欠である. Ku80欠乏症は,哺乳類の成長制御を意外と損なうこともあります.

科学分野:

  • 分子生物学は分子生物学である.
  • 免疫学 免疫学とは
  • 遺伝学 遺伝学とは

背景:

  • DNA依存型タンパク質キナーゼ (DNA-PK) は,DNA修復,複製,転写,V(D) J再結合に不可欠である.
  • DNA-PKのDNA結合サブユニットKu80は,これらのプロセスにおいて重要な役割を果たしています.

研究 の 目的:

  • DNA-PKのKu80サブユニットのインビボ機能を調査する.
  • リンパ球の発達とDNA修復メカニズムにおけるKu80の役割を明らかにする.

主な方法:

  • マウスにおけるKu80の標的遺伝子ノックアウト (Ku80-/-).
  • ミュータントマウスにおけるリンパ球発達の分析とV(D) Jの再編成.
  • Ku80-/- 線維芽細胞における細胞増殖,倍増時間,細胞サイクルチェックポイントの評価.

主要な成果:

  • Ku80欠乏は,TおよびBリンパ球の発達を停止させ,V(D) Jの再編成を阻害しました.
  • Ku80-/-マウスは,対照群より40~60%小さく,著しい成長欠陥を示した.
  • Ku80-/-胚からの線維芽細胞は,増殖が減り,倍増時間が長く,細胞サイクルチェックポイントが保たれていました.

結論:

  • Ku80は,正常なリンパ球の発達とV(D) J再結合に不可欠です.
  • この研究は,哺乳類の成長制御におけるKu80の予期せぬ役割を明らかにした.
  • Ku80の機能はDNA修復を超えて,細胞増殖と全体的な生物の成長に影響を与える.
要旨

No abstract available in PubMed .

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