PDE4阻害剤アプレミラストは,腸内膠質細胞のNrf-2信号経路を活性化することによって,TNBS誘発の刺激性腸症候群をマウスで改善する
Yu-Hao Lu1,2, Shu-Yue Lei1,2, Tao Yang1,2
1State Key Laboratory of Chemical Biology, Shanghai Institute of Materia Medica, Chinese Academy of Sciences, Shanghai, 201203, China.
Acta pharmacologica Sinica
|September 1, 2025
まとめ
アプレミラストはフォスフォディエステラーゼ4 (PDE4) 阻害剤で,腸内膠細胞 (EGC) の活性化を抑制することで,刺激性腸症候群 (IBS) の症状を緩和します. これはNrf-2経路を通じて起こり,IBSモデルでは炎症と酸化ストレスが軽減されます.
科学分野:
- 胃腸内科
- 神経免疫学
- 薬理学について
背景:
- 腸内膠質細胞 (EGC) は,刺激性腸症候群 (IBS) の病原化に関与しています.
- PDE4抑制は炎症性疾患の治療策である.
- PDE4は細胞内循環性アデノシンモノフォスファート (cAMP) レベルを調節し,炎症反応に影響を与えます.
研究 の 目的:
- PDE4のIBSにおける役割を調査する.
- PDE4阻害剤アプレミラストの治療効果をIBSのマウスモデルで評価する.
- エプレミラストのEGCに対する作用の分子メカニズムを解明する.
主な方法:
- 2,4,6-トリニトロベンゼン硫酸 (TNBS) を使用してマウスでIBSモデルを誘導した.
- ネズミは7日間アプレミラスト (50 mg/ kg) を投与した.
- 腸の運動性,内臓の敏感性,EGCの活性化,炎症マーカー,酸化ストレス,Nrf- 2経路を評価した.
主要な成果:
- アプレミラスト治療は,TNBS誘発のIBSマウスにおいて,腸の運動性を有意に改善し,内臓過敏症を減少させた.
- IBSマウスの大腸でEGCが活性化することが判明した.
- in vitroでは,アプレミラストは,Nrf- 2信号経路を活性化することで,EGCの活性化と炎症媒体の放出を抑制し,同時に酸化ストレスも軽減した.
結論:
- アプレミラストによるPDE4抑制は,マウスモデルでIBSの症状を効果的に改善しました.
- アプレミラストはNrf-2経路経由でEGCの活性化を抑制することで治療効果を発揮する.
- PDE4をターゲットにすることで,神経炎症と酸化ストレスを調節することで,IBSに対する有望な治療戦略を提供します.
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