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バクテリアは,痛みや炎症を調節する感覚神経細胞を活性化させます
Isaac M Chiu1, Balthasar A Heesters, Nader Ghasemlou
1Kirby Neurobiology Center, Boston Children's Hospital, Harvard Medical School, Boston, Massachusetts 02115, USA.
Nature
|August 23, 2013
まとめ
バクテリアは,痛みを感知するニューロンを直接活性化し,感染時に痛みを引き起こします. この痛みの感覚は免疫反応とは独立しており,宿主-病原体相互作用における直接的な神経系の役割を明らかにしています.
科学分野:
- 神経科学は神経科学である.
- 免疫学 免疫学とは
- 微生物学 微生物学とは
背景:
- ノシセプターニューロンは有害な刺激を検知し,痛みや防御行動を開始します.
- バクテリア感染症は,よく理解されていないメカニズムを通じて痛みを引き起こし,しばしば免疫媒介であると仮定されます.
研究 の 目的:
- 細菌が痛覚受容体を活性化し,痛みを誘発する直接的なメカニズムを調査する.
- バクテリア感染による痛みにおける免疫系の役割を決定する.
主な方法:
- Staphylococcus aureus感染のマウスモデルを使用した.
- 評価された機械的および熱的過痛症.
- カルシウムイメージングと電気生理学による神経細胞活性化の調査.
- 特定のバクテリアの成分 (N-formylatedペプチド,α-haemolysin) の役割を調べました.
- Nav1.8系ニューロンの遺伝的アブレーションを使用しました.
主要な成果:
- ネズミの細菌感染による痛みは,TLR2,MyD88,T細胞,B細胞,中性子,単細胞とは無関係です.
- 痛みと過敏症は,生細菌の負荷と相関しており,腫れや免疫マーカーではありません.
- バクテリアは,N-ホルムライテッドペプチドとα-ヘモリシン経由で,ノシセプターに直接誘導されたカルシウム流量とアクションポテンシャルを誘導した.
- Nav1.8ニューロンの切除は痛みを軽減したが,局所的な免疫浸透とリンパ腺病を増加させた.
結論:
- 細菌はノシセプターを直接活性化し,感染中に痛みを引き起こします.
- 感覚ニューロンは,宿主-病原体相互作用の間に炎症を調節する上で予期せぬ役割を果たします.
- 病原体による神経系活性化は宿主反応の重要な構成要素である.
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