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T Cells Capture Bacteria by Transinfection from Dendritic Cells
Published on: January 13, 2016
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dendritic 細胞の T 細胞の関与は,MHC II クラス輸送を迅速に再編成します
Marianne Boes1, Jan Cerny, Ramiro Massol
1Department of Pathology, Harvard Medical School, 200 Longwood Avenue, Boston, Massachusetts 02115, USA.
Nature
|August 29, 2002
まとめ
研究者らは,抗原を提示する細胞内で,メジャー・ヒストコンパティビリティ・コンプレックス (MHC) クラスII分子がどのように輸送されるかを視覚化しました. 彼らは,これらの分子が免疫反応中にT細胞に向かって伸びる管状の構造を形成することを観察しました.
科学分野:
- 免疫学 免疫学とは
- 細胞生物学 細胞生物学
- 分子生物学は分子生物学である.
背景:
- メジャー・ヒストコンパティビリティ・コンプレックス (MHC) クラスIIの分子は,Tリンパ球に抗原を提示するために重要である.
- MHCクラスIIの組み立ては,エンドプラズマ網膜で発生し,輸送は内細胞経路を伴う.
- 抗原呈現細胞 (APC) でのMHCクラスIIの輸送は,炎症信号によって厳しく調節され,影響を受けます.
研究 の 目的:
- 抗原を提示する細胞におけるMHCクラスIIの分子の生体輸送ダイナミクスを調査する.
- T細胞の相互作用に反応するMHCクラスIIの細胞内輸送を視覚化します.
- T細胞の反応を促進する細胞構造の役割を理解する.
主な方法:
- 強化された緑色光タンパク質 (EGFP) タグ付きMHCクラスII分子を発現するトランスジェニックマウスを生成した.
- 観察のために骨髄由来のデンドリット細胞とインシット・ランゲルハンズ細胞を使用した.
- MHCクラスIIの輸送パターンを追跡するために,生細胞画像を用いた.
主要な成果:
- dendritic 細胞の末期エンドサイト構造内の観察された MHC II クラスの分子, in situ Langerhans 細胞パターンを反映しています.
- MHCクラスII分子を含む管状エンドソームが細胞内まで広がることが示された.
- この管状化は特異的であり,抗原に負荷されたデンドリート細胞が同類のT細胞と相互作用するときにのみ発生することを示した.
結論:
- MHCクラスIIの分子は,APCの管状エンドソームを通して動的に輸送されます.
- このT細胞に向けての導管化は,特定の抗原の認識に依存する規制されたプロセスである.
- 提唱されたチューブ化のメカニズムは,効率的なT細胞活性化と免疫応答を促進します.
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