人間の微生物群から合理的に選択されたクロストリディア菌株の混合物によるTreg誘導
Koji Atarashi1, Takeshi Tanoue, Kenshiro Oshima
1RIKEN Center for Integrative Medical Sciences (IMS-RCAI), 1-7-22 Suehiro-cho, Tsurumi-ku, Yokohama, Kanagawa 230-0045, Japan.
Nature
|July 12, 2013
まとめ
研究者らは,ヒトの腸内微生物群から17の有益な細菌株を隔離し,調節性T (Treg) 細胞を効果的に誘導した. これらのクロストリディア菌株は,一緒に投与された場合,免疫システムを調節することにより,炎症性およびアレルギー性疾患の治療の可能性を示しています.
科学分野:
- 微生物学 微生物学とは
- 免疫学 免疫学とは
- 胃腸内科 胃腸内科
背景:
- 腸内微生物群の操作は,炎症性およびアレルギー性疾患において有望である.
- 特定の免疫反応を標的とした,より効果的な宿主互換性プロバイオティクスの必要性が存在します.
研究 の 目的:
- CD4 ((+)) FOXP3 ((+)) 調節性T (Treg) 細胞を誘発するヒトの腸内細菌を合理的に隔離する.
- 免疫媒介疾患の治療の可能性のある細菌株を特定する.
主な方法:
- 合理的な選択プロセスを利用し,ヒトの糞便サンプルから始まり,マウスのTreg細胞誘発種を豊かにしました.
- 17種類の細菌株を,Treg細胞の豊富性と抗炎症分子生産 (IL-10,ICOS) を増加させる能力に基づいて分離し,特徴づけました.
- 細菌種を特定し,毒素/ウイルス性因子を評価するためにゲノム配列を解析を行いました.
主要な成果:
- クロストリディア群IV,XIVa,XVIIIに属する17種類の強力なTreg細胞誘発細菌株が分離されました.
- これらの菌株には,有毒物質や毒性の要因が欠けている.
- 17株の組み合わせの経口投与は,マウスモデルにおける衰弱性大腸炎とアレルギー性下痢を引き起こした.
結論:
- 特定された細菌コミュニティは,抗原とTGF-βが豊富な環境を通じてTreg細胞の拡大と分化を促進します.
- これらの菌株は,ヒト免疫疾患の治療操作に合わせた潜在的な戦略を提供します.
- この発見は,炎症性およびアレルギー性疾患に対する標的型プロバイオティックの開発を進めています.
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