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病理的に拡張した周辺Tヘルパー細胞のサブセットは,リウマチ性関節炎におけるB細胞を駆動する
Deepak A Rao1, Michael F Gurish1, Jennifer L Marshall2
1Division of Rheumatology, Immunology, and Allergy, Brigham and Women's Hospital and Harvard Medical School, Boston, Massachusetts 02115, USA.
Nature
|February 3, 2017
まとめ
研究者らは,リウマチ性関節炎患者において,外周ヘルパーT細胞 (TPH) と呼ばれる新しいタイプのCD4+T細胞を特定しました. これらのTPH細胞は,炎症した組織におけるB細胞抗体の生成を促進します.
科学分野:
- 免疫学
- リウマトロジ
- 細胞生物学
背景:
- リウマチ性関節炎のような 自己免疫疾患において CD4+T細胞は重要な役割を果たします
- 組織における病原性T細胞の特定のエフェクター機能を特定することは困難である.
- 最近の活性化のマーカーは,病原性CD4+T細胞を感染した組織で特定するのに役立ちます.
研究 の 目的:
- 病原性CD4+T細胞を特定し,特徴づけること
- リウマチ性関節炎の関節組織における活性化T細胞のエフェクター機能を定義する.
- PD-1hiCXCR5- CD4+ T細胞の自己免疫病理における役割を調査する.
主な方法:
- マス・サイトメトリーと多次元サイトメトリーは,リウマチ性関節炎患者のシノヴィウム内のT細胞を分析するために使用されました.
- 異なったT細胞群を比較するために,トランスクリプトミア分析が行われました.
- B細胞の助成能力を評価するために,in vitroの機能分析を用いた.
主要な成果:
- 異なるPD-1hiCXCR5- CD4+ T細胞の集団は,TPH細胞と呼ばれ,関節リウマチシノビアに拡張されました.
- TPH細胞は,IL-21,CXCL13,ICOS,MAFなどの因子を発現し,B細胞の助けとなる.
- トランスクリプトミクスは,炎症部位移動のためのケモカイン受容体を含む,TPH細胞の独特の発現プロフィールをT毛細血管ヘルパー細胞と比較して明らかにした.
- TPH細胞は,プラズマ細胞の分化と抗体生成をインビトロで促進する.
結論:
- PD-1hiCXCR5- TPH細胞は,リウマチ性関節炎で拡大したユニークなCD4+T細胞サブセットである.
- TPH細胞は,炎症した非リンパ球組織内のB細胞反応と抗体生成を促進する準備ができています.
- これらの発見は,関節リウマチの病原性を駆動する細胞メカニズムに関する新しい洞察を提供します.
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