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トール型受容体2は,Staphylococcus aureusが誘発した心筋機能障害と心臓のサイトカイン生成を媒介する
Pascal Knuefermann1, Yasushi Sakata, J Scott Baker
1Department of Pediatrics, Baylor College of Medicine and Texas Children's Hospital, Houston, Tex, USA.
Circulation
|December 1, 2004
まとめ
トール型受容体2 (TLR2) 欠乏症は,Staphylococcus aureus sepsis.で心臓を保護する. TLR2が不足すると,炎症反応が鈍化し,心臓の機能不全を予防し,TLR2を強調します.
科学分野:
- 免疫学 免疫学とは
- 心臓病学 心臓病学
- 微生物学 微生物学とは
背景:
- Staphylococcus aureusセプシスは,心筋機能不全につながる可能性があります.
- トール型受容体2 (TLR2) は,S. aureus. aureusに対する炎症反応を媒介する役割を果たします.
- TLR2は,心臓内の先天的な免疫反応を誘発する可能性があります.
研究 の 目的:
- S. aureusによって引き起こされる心臓機能不全におけるTLR2の役割を調査する.
- TLR2欠乏が心臓の炎症媒介体の生成を弱めるかどうかを判断する.
- S. aureusによって引き起こされる心臓機能不全に対するTLR2欠乏の影響を評価する.
主な方法:
- 野生型とTLR2欠乏性 (TLR2D) のマウスの比較.
- 2つのマウス群でS. aureusに挑戦した.
- 心臓の炎症メディエーター (TNF,IL-1β,NO) の測定.
- 細胞内信号伝達経路 (IRAK,JNK,NF-kappaB,AP-1) の分析について
- 心臓の収縮機能の評価.
主要な成果:
- S. aureusチャレンジは,野生型のマウスでは心臓の炎症媒介体を増加させたが,TLR2Dマウスではそうではなかった.
- TLR2欠乏症は,心臓の重要な炎症信号伝達経路の活性化を鈍化させた.
- TLR2Dマウスは,S. aureusが誘発した心臓収縮機能障害に対する保護を示した.
結論:
- TLR2シグナル伝達は,S. aureusセプシス中に心筋機能不全に大きく寄与する.
- TLR2は,S. aureus.への反応として,心臓のサイトカイン生成と収縮性の喪失を媒介する.
- TLR2を標的とした治療は,結血病による心臓疾患の治療策となるかもしれません.
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