変異遺伝子マウスの免疫グロブリン発現と自己反応性Bリンパ球の機能的な静止が変化した
C C Goodnow1, J Crosbie, S Adelstein
1Clinical Immunology Research Centre, University of Sydney, New South Wales, Australia.
Nature
|August 25, 1988
まとめ
免疫学における自己耐性症は,クローン欠損なしに起こる可能性があります. トランスジェニックマウスでは,B細胞はIgDを維持したが,抗体分泌を失い,IgDが示唆された.
科学分野:
- 免疫学 免疫学とは
- 分子生物学は分子生物学である.
- トランスジェニックモデル
背景:
- 免疫的耐性は,自己免疫疾患を予防する.
- クロンの消去は,自己耐性の主要なメカニズムである.
- B細胞受容体シグナリングは,B細胞の発達と耐容性にとって重要です.
研究 の 目的:
- クローン欠損を超えた免疫的耐性のメカニズムを調査する.
- B細胞耐性における免疫グロブリンD (IgD) の役割を調べる.
- トランスジェニックモデルのネオセルフ抗原に対するB細胞の反応を特徴付ける.
主な方法:
- ニワトリの卵ライゾ酵素 (HEL) とアンチ-HEL抗体を発現する二重トランスジェニックマウスの生成.
- 表面免疫グロブリン (IgM,IgD) 発現を含むB細胞集団の分析.
- B細胞の抗体分泌能力の評価.
主要な成果:
- ダブルトランスジェニックのマウスは,HELに対する免疫的耐性を示した.
- ほとんどの抗HELB細胞は,クローナル・デレーションを受けなかった.
- これらのB細胞は,表面IgMの減少,高表面IgD,および抗体分泌の低下を示した.
結論:
- 自己耐性は,クローンの削除から独立したメカニズムを通じて確立することができます.
- 免疫グロブリンD (IgD) は,B細胞耐性を維持する上で重要な役割を果たす可能性があります.
- 削除ではなく,変化したB細胞のシグナル伝達が,機能的自己耐性につながる可能性があります.
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