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N-アセチルシステインアミドがラットの腎虚血再灌流損傷モデルにおける酸化ストレスとアポトーシスを軽減

iLIFE by iLIFE
2026年1月27日
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**ニュース記事**

**腎虚血再灌流障害に対するN-アセチルシステインアミドの保護効果を確認**

腎虚血再灌流(IR)障害は急性腎障害の主要な原因であり、酸化ストレス(OS)とアポトーシスが中心的な役割を果たしています。N-アセチルシステインの脂溶性誘導体であるN-アセチルシステインアミド(NACA)は、細胞内浸透性と抗酸化活性が向上しています。本研究では、ラットモデルを用いてNACAの腎保護効果を調査しました。

28匹の雌ウィスターアルビノラットが4つのグループ(各7匹)に無作為に分けられました:コントロール、IR、NACA+IR(虚血の30分前に100 mg/kgを腹腔内投与)、IR+NACA(虚血直後に100 mg/kgを腹腔内投与)。右腎摘出後、左腎の血管を60分間クランプし、24時間再灌流しました。血清腎機能マーカー、腎OSパラメータ、組織病理学的損傷、カスパーゼ-3の免疫反応性が評価されました。

腎IR障害は、血清尿素窒素およびクレアチニンレベルを有意に増加させ、尿細管の拡張、キャスト形成、変性を特徴とする組織病理学的損傷を引き起こしました。カタラーゼ(CAT)およびスーパーオキシドジスムターゼ(SOD)の活性は有意に変化し、マロンジアルデヒドはIR後に増加し、NACA前処置によって減少しましたが、ミエロペルオキシダーゼおよび総グルタチオンはグループ間で有意な差は見られませんでした。NACA前処置は、炎症細胞の浸潤、尿細管の拡張、カスパーゼ-3の免疫反応性を軽減し、CATおよびSOD活性を部分的に回復させました。一方、虚血後のNACA投与は、特にアポトーシスおよび炎症浸潤の軽減において効果が低下しました。

NACAは腎IR障害に対して部分的な腎保護を提供し、前処置が優れた効果を示しました。これらの結果は、抗酸化剤の投与タイミングの重要性を強調し、腎虚血が予測可能な場合の予防戦略としてNACAの可能性を示唆しています。

NAC N-acetyl cysteine

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