リンパ腫の誘発性変異は,象徴的なヒト自身抗体の病原性進化に起因する
Mandeep Singh1, Katherine J L Jackson1, Jing J Wang2
1The Garvan Institute of Medical Research, Darlinghurst, NSW 2010, Australia.
Cell
|February 16, 2020
まとめ
変性B細胞はリウマチ因子自己抗体を生成し,リンパ性悪性腫瘍とのメカニズムを共有しています. これらの細胞は変異を蓄積し,血管炎で病原性自己抗体を作り出し,リンパ腫形成の前段階を明らかにします.
科学分野:
- 免疫学
- 腫瘍学
- 遺伝学
背景:
- 病原性自己抗体は自己免疫疾患の特徴ですが,その細胞起源と免疫チェックポイントの回避は不明です.
- 混合型低血球性血管炎は病原性リウマチ因子自己抗体と関連しているが,その基礎となる細胞メカニズムは完全に理解されていない.
研究 の 目的:
- 病原性自己抗体生成とリンパ性悪性腫瘍の共通のメカニズムを調査する.
- 自己抗体を生成するB細胞が 免疫チェックポイントを回避する方法を解明する.
主な方法:
- DNAとRNAの配列解析を含む単細胞マルチオミクス分析
- 血清抗体ペプチド配列と抗体合成
- B細胞のクローンツリーと体変異の分析
主要な成果:
- 病原性自己抗体を生成する希少な循環するBリンパ球は,累積された変異を持つクローンツリーを形成する.
- これらのB細胞は,増殖を制御する遺伝子とV(D) J変異 (例えば,CARD11,TNFAIP3,CCND3) のリンパ腫ドライバー変異を宿している.
- 抗体V(D) J変異は,より低い温度で自己抗体の集積を誘導することによって,病原性を誘導する.
結論:
- クローン拡大と体変異を含む,自己抗体生成とリンパ性悪性腫瘍の間に共通のメカニズムが存在する.
- この研究はヒトのリンパ腫形成の前段階を特定した.
- 自身抗体における体内変異は,その蓄積につながり,疾患の病原化に寄与する.
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