HLA-DR15分子は多発性硬化症における自己反応性T細胞のレパートリーを共同で形成する
Jian Wang1, Ivan Jelcic1, Lena Mühlenbruch2
1Neuroimmunology and MS Research, Neurology Clinic, University Hospital Zurich, University of Zurich, Zurich 8091, Switzerland.
Cell
|October 22, 2020
まとめ
多発性硬化症 (MS) の主要なリスク因子であるHLA-DR15ハプロタイプは,自己反応性T細胞を形成する. この研究は,HLA-DR15アロモルフが自己ペプチドと外来抗原を提示し,MSの病原化に寄与する方法を明らかにしています.
科学分野:
- 免疫学
- 神経免疫学
- 遺伝学
背景:
- HLA-DR15ハプロタイプは多発性硬化症 (MS) の主要な遺伝的リスク因子です.
- HLA-DR15がMSの病原化に寄与する正確なメカニズムは,まだ完全に理解されていません.
- 自己反応性CD4+T細胞と,抗原を提示する細胞として機能するB細胞は,MSに関与しています.
研究 の 目的:
- HLA-DR15アロモルフDR2aとDR2bの免疫ペプチドームを特徴付ける.
- HLA-DR15が自己反応性T細胞に自己ペプチドと外来抗原を提示する役割を調査する.
主な方法:
- 主要なヒトB細胞,単細胞,胸腺,およびMS脳組織からの免疫ペプチドームの分析.
- 自己反応性CD4+T細胞クローンの特徴
- HLA-DR分子 (HLA-DR-SPs) から派生した自己ペプチドの識別
主要な成果:
- DR2aとDR2bを含むHLA-DR分子からの自己ペプチドは,B細胞と胸膜抗原を提示する細胞に豊富に含まれていた.
- 自己反応性CD4+T細胞クローンはHLA-DR-SPsと交互反応した.
- これらのT細胞クローンは,エプスタイン・バーウイルスとアクルマンシア・ムチニフィラのペプチドと,DR2aとDR2bによって提示される自己抗原も認識しました.
結論:
- 両方のHLA- DR15アロモルフ (DR2aとDR2b) は,MSにおける自己反応性T細胞のレパートリー形成に寄与する.
- HLA-DR15は,抗原を提示する構造とエピトープ源の両方として作用します.
- HLA-DR15によって自己反応性T細胞に共有された外来ペプチドと自己抗原の提示は,MSの病原性における重要なメカニズムである.
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