イタコナートおよびその誘導体の電子性特性は,IκBζ-ATF3炎症軸を調節する
Monika Bambouskova1, Laurent Gorvel1, Vicky Lampropoulou1
1Department of Pathology and Immunology, Washington University School of Medicine, St. Louis, MO, USA.
Nature
|April 20, 2018
まとめ
ディメチルイタコネート (DI) は,電離性ストレスを誘発し,IκBζ誘導を阻害することによって免疫反応を調節する. この経路は 牛皮病のような自己免疫疾患を 治療する可能性を秘めています
科学分野:
- 免疫学
- 代謝の調節
- 細胞 の ストレス 反応
背景:
- 免疫反応は代謝の調節によって導かれ,炎症性マクロファージはイタコナートを産生する.
- イタコナートとその誘導体であるディメチルイタコナート (DI) は,特定のサイトカインを選択的に抑制する免疫調節代謝産物である.
- 以前の研究でイタコナートの効果が デヒドロゲネーゼ阻害と関連付けられましたが,これは免疫調節効果を完全に説明できません.
研究 の 目的:
- 炎症に対するイタコナートとDIの選択的効果の背後にある規制経路を定義する.
- DIが選択的に炎症反応を調節するメカニズムを調査する.
主な方法:
- イタコナートとDIが細胞代謝と免疫信号伝達に及ぼす影響を調査した.
- Nrf2 (NFE2L2) 依存型および独立型応答測定法を使用した.
- IκBζとATF3を含む主要な媒介体と規制経路を特定した.
- 牛皮病のマウスモデルでDIの有効性をテストした.
主要な成果:
- イタコネートとDIは,グルタチオンと反応して,電離性ストレスを引き起こす.
- このストレスは,Nrf2に依存する反応と,Nrf2に依存しない反応の両方を活性化させます.
- IκBζタンパク質誘導は,重要な二次転写反応である.
- このNrf2独立の調節の媒介体としてATF3が特定されました.
- インビオDI投与は,牛皮病のモデルにおいて,IL-17-IκBζによる皮膚病変を改善した.
結論:
- イタコナートとDIは,電離性ストレスとIκBζ誘導の抑制によって免疫調節効果を発揮する.
- DI-IκBζ制御軸はNrf2から独立し,ATF3によって媒介される.
- DI-IκBζ経路をターゲットにすることで,IL-17とIκBζによって引き起こされる自己免疫疾患に対する潜在的な治療戦略が提示されます.
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