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B細胞におけるヒトIgE合成の誘導は,マスト細胞とベースフィールによって行われる
J F Gauchat1, S Henchoz, G Mazzei
1Glaxo Institute for Molecular Biology, Geneva, Switzerland.
Nature
|September 23, 1993
まとめ
アレルギーにおける重要な役割を果たすマスト細胞とベースフィルは,免疫グロブリンE (IgE) の産生を直接調節することができます. これらの細胞は,IgE合成を刺激するCD40リンガンド (CD40L) を発現し,炎症媒介体を放出する以上の新しい役割を示唆しています.
科学分野:
- 免疫学 免疫学とは
- アレルギー研究 アレルギー研究
- 細胞生物学 細胞生物学
背景:
- 免疫グロブリンE (IgE) がFcエプシロンR1にマスト細胞とベースフィールに結合すると,アレルギー反応が始まります.
- アレルゲンによるIgEのクロスリンクは,炎症媒介体の放出を誘発する.
- B細胞のIgE生産には,伝統的にT細胞の相互作用,粘着分子,IL-4やIL-13のようなサイトカインが必要です.
研究 の 目的:
- IgEの産生を調節するマスト細胞とベースフィルの役割を調査する.
- マスト細胞とベースフィルが,IgE合成に必要な細胞接触信号を提供できるかどうかを判断する.
- このプロセスに関与する特定の分子を特定するために.
主な方法:
- ヒトのマスト細胞 (HMC-1) とベソフィル細胞 (KU812) を利用した.
- IL-4の存在下でIgE生成を評価した.
- CD40リガンド (CD40L) の発現と機能を研究した.
- 新鮮に分離されたヒト肺のマスト細胞と血液のベースフィルを検査した.
主要な成果:
- マスト細胞とバソフィル細胞系は,IL-4の存在で,IgE合成のための細胞接触信号を提供する.
- HMC-1とKU812の両方の細胞系はCD40Lを発現し,CD40LはIgEの生成を誘発する主要な分子として特定されました.
- 主要なヒトのマスト細胞とベースフィルもCD40Lを発現し,IgEの産生を誘発することができる.
結論:
- マスト細胞とベースフィルは,T細胞とは無関係にIgEの産生を直接調節することができる.
- マスト細胞とベースフィルで発現するCD40Lは,IgE合成を刺激する上で重要な役割を果たします.
- これらの発見は,アレルギー性疾患におけるマスト細胞とベースフィルの二重の役割を示唆しています:媒介体放出とIgE生産の直接的調節です.
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