RNA アプタマーを改変されたDNA アプタマーに変換することで,長期にわたる安定性と強化された抗腫瘍活性が得られる
Paola Amero1, Ganesh L R Lokesh2, Rajan R Chaudhari1
1Department of Experimental Therapeutics, The University of Texas MD Anderson Cancer Center, Houston, Texas 77030, United States.
Journal of the American Chemical Society
|May 14, 2021
まとめ
フォスフォ-AXLを標的とした改変DNAアプタマーは,安定性と生物利用性を改善し,有望な治療アプローチを提供している. これらのアプタマーは,臨床前モデルにおいて,腫瘍の成長と転移を効果的に減少させた.
科学分野:
- 生物化学
- 分子生物学
- 薬理学について
背景:
- アプタマーは抗体のようなオリゴヌクレオチドで,副作用がほとんどないため,治療的な可能性があります.
- アプタマーの安定性と臨床用途の生物学的利用性については,課題が残っています.
- Phospho-AXLは卵巣がんを含む様々な癌に関与する標的である.
研究 の 目的:
- 強化された安定性と生物利用性を有する,フォスフォ-AXLを標的とした改変DNAアプタマーを開発する.
- これらの改変したアプタマーの in vitro および in vivo の有効性を評価する.
- アプタマーベースの治療法の臨床翻訳のための基盤を確立する.
主な方法:
- フォスフォ-AXLを標的とするRNAアプタマーを改変したDNAアプタマーに変換する.
- 17種類の改変DNAアプタマー候補の比較分析
- 脊髄チオホスファート/ディチオホスファートと5'-endポリエチレングリコール結合を含む化学的変更.
- 卵巣がんのオートトープマウスモデルにおける in vitro と in vivo 評価
主要な成果:
- 選択されたアプタマー候補GLB- G25とGLB- A04は優れた生物利用性と安定性を示した.
- 改良されたアプタマーは,最適化された薬理学,減少した核酵素水解,および腎臓クリアランスを示した.
- 腫瘍の成長と転移の有意な減少が in vivo で観察されました.
- 低用量では,高度かつ持続的なフォスフォ-AXLの抑制が達成されました.
結論:
- アプタマーの化学的改変により,安定性と生物利用性が著しく改善されます.
- フォスフォ-AXLを標的とした改変したアプタマーは,臨床前卵巣がんモデルにおいて強力な抗腫瘍効果を示した.
- これらの発見は,改変したアプタマーとコンパニオンバイオマーカーの臨床翻訳を支持する.
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