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腸内細胞に対するリシン毒性は,酸化ストレスによって媒介される複数の細胞死につながる
Francesco Biscotti1, Massimo Bortolotti1, Federica Falà1
1Department of Medical and Surgical Sciences-DIMEC, Alma Mater Studiorum, University of Bologna, Via San Giacomo 14, 40126 Bologna, Italy.
Toxins
|August 27, 2025
まとめ
リシン毒素は 腸内細胞を傷つけ 腸内バリア機能を 損なう. アポプトーシス,ネクロプトーシス,酸化ストレスを含む細胞死経路は関与しているが,抑制できる.
科学分野:
- 毒理学について
- 細胞生物学
- 胃腸内科
背景:
- カスタード豆に含まれる強力な毒素であるリシンが 摂取すると重大な危険性があります
- 系統的リシンの毒性は知られているが,局所的な胃腸作用についてはさらなる調査が必要である.
- 腸内皮質細胞に対するリシンの影響を理解することは,健康上のリスクを評価するために極めて重要です.
研究 の 目的:
- ヒト腸内皮質細胞系 (HT29とCaco-2) に起するリシンの細胞毒性作用を調査する.
- 腸内皮質壁の整体性に対するリシンの影響を評価する.
- アポプトーシス,ネクロプトーシス,酸化ストレスを含む,リシン誘発細胞死亡のメカニズムを解明する.
主な方法:
- HT29およびCaco-2細胞に対するリシン細胞毒性を評価するために,投与量および時間応答アッセイを使用した.
- トランス-エピテリア電阻 (TEER) 測定は,Caco-2単層におけるエピテリアバリアの整合性を評価した.
- 流動細胞計は細胞死を分析し,細胞死阻害剤と抗酸化剤の効果をテストした.
主要な成果:
- 24~72時間後にナノモラーEC50値でHT29およびCaco-2細胞に対して高い細胞毒性を示した.
- リシンは24時間以内に0. 1~1nMの濃度でCaco-2細胞のTEER値を有意に低下させた.
- 細胞死は,阻害剤 (Z-VAD,ネクロスタチン-1) と抗酸化剤 (カタラゼ,BHA,ピル酸ナトリウム) によって予防可能であった.
結論:
- リシンはヒトの腸内皮質細胞に重大な細胞毒性および障壁破壊作用を示しています.
- アポプトーシス/ネクロプトーシスと酸化ストレスが,胃腸内部のリシン誘発細胞死を引き起こす主要なメカニズムです.
- 細胞死経路の阻害剤と抗酸化剤は,リシンの局所的毒性効果を緩和する可能性がある.
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