アルテミシニンは,Plasmodium falciparumのSERCAをターゲットにしています
U Eckstein-Ludwig1, R J Webb, I D A Van Goethem
1Department of Cellular and Molecular Medicine, St George's Hospital Medical School, Cranmer Terrace, London SW17 0RE, UK.
Nature
|August 22, 2003
まとめ
強力な抗マラリア薬であるアルテミシニンは,Plasmodium falciparum SERCA (PfATP6) のオーソログを標的としています. 鉄はアルテミシニンを活性化させ,PfATP6を抑制し,食物真空圏外での寄生虫の死につながる.
科学分野:
- 寄生虫学とは,寄生虫学である.
- 薬用化学 薬用化学について
- 分子生物学は分子生物学である.
背景:
- アルテミシニンは,多剤耐性マラリアに対する重要な抗マラリア薬です.
- 彼らの正確な分子標的は,広範な使用にもかかわらず,捉え難いままです.
- アルテミシニンは,甘いワームウッド (Artemisia annua) から派生したセスキーターペンのラクトンです.
研究 の 目的:
- プラズモディアム・ファルシパラム (Plasmodium falciparum) のアルテミシニンの分子標的を特定する.
- アルテミシニンの作用と活性化のメカニズムを解明する.
主な方法:
- プラズモディアム・ファルシパラム (Plasmodium falciparum) のSERCAオーソローグ (PfATP6) を発現するXenopus卵細胞を用いた抑制アッセイ.
- 有名なSERCA阻害剤であるタプシガージンによる対抗性研究.
- デソキシアルテミシニンの活性に関する評価.
- デスフェリオキサミンによる鉄のケレーション実験.
- 標識されたアルテミシニンとタプシガルギンで寄生虫の光成像.
主要な成果:
- アルテミシニンはPfATP6を阻害し,その効能はタプシガージンに匹敵する.
- タプシガーギンは,アルテミシニンの抗マラリア作用を阻害する.
- デソキシアルテミシニンは,エンドペロキシドブリッジがないため,無効です.
- 鉄のケラ化は,アルテミシニンの抗寄生虫作用とPfATP6抑制を無効にします.
- アルテミシニンは寄生虫を鉄に依存した方法で標識し,サイトゾールに局所する.
結論:
- アルテミシニンは,プラズモディウム・ファルシパラム (Plasmodium falciparum) のSERCAオーソログ (PfATP6) を阻害することで機能する.
- 鉄 (Fe2+) は,アルテミシニンの活性化に不可欠であり,エンドペロキシドブリッジの割れ目を容易にする可能性があります.
- 標的部位は食物真空球の外にあり,細胞性局在が観察されている.
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