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C. elegansの免疫活性化に対する宿主保護におけるXBP-1の重要な役割
Claire E Richardson1, Tristan Kooistra, Dennis H Kim
1Department of Biology, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA.
Nature
|February 26, 2010
まとめ
X-box結合タンパク質1 (XBP-1) が媒介する展開タンパク質応答 (UPR) は,先天免疫活性化中に宿主防御誘発のERストレスからネモトードCaenorhabditis elegansを保護する. この研究は,XBP-1を明らかにしています.
科学分野:
- 細胞生物学 細胞生物学
- 免疫学 免疫学とは
- 発達生物学 発達生物学について
背景:
- 展開タンパク質応答 (UPR) は,エンドプラズマ網膜 (ER) ホメオスタシスを維持するための保存された細胞機構です.
- IRE1-XBP1経路は,UPRの重要な分岐であり,分泌細胞の分化に不可欠であり,免疫に関与しています.
- Caenorhabditis elegansの先天性免疫は,病原体に対する耐性のためのPMK-1 p38 MAPK経路に依存しています.
研究 の 目的:
- 生まれながらの免疫におけるX-box結合タンパク質1 (XBP-1) の役割と,Caenorhabditis elegans発症中のUPRとの関連を調査する.
- PMK-1 MAPK経路,XBP-1-媒介UPR,および微生物病原体に対する宿主防御の相互作用を解明する.
主な方法:
- Caenorhabditis elegansにおけるxbp-1とPMK-1の機能喪失変異体を利用した.
- Pseudomonas aeruginosaおよび非病原性細菌に感染した野生型および変異性ワーム.
- ER形態学,幼虫死亡率,免疫応答の活性化を評価した.
主要な成果:
- PMK-1-媒介の先天性免疫応答の活性化により,C. elegans.におけるXBP-1-依存のUPRが誘発される.
- xbp-1の喪失は,病原性P. aeruginosa.感染時にER形態学的障害と幼虫の致死につながる.
- PMK-1-媒介の免疫の喪失は,P. aeruginosa.に感染したxbp-1変異体の幼虫の致死性を抑制する.
- PMK-1の過剰活性化により,病原性細菌がない場合でもxbp-1変異体における幼虫の致死性が生じます.
結論:
- 生まれつきの免疫は,C. elegansの発達中にERストレスが生理的に誘発されるように作用する.
- XBP-1は,宿主を微生物に対する先天的な免疫反応の有害な影響から守る上で重要な役割を果たします.
- XBP-1は,免疫反応の発生に伴う細胞ストレス軽減に保護的役割を果たしている.
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