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血液代用品として使用するように設計されたヒト再結合ヘモグロビン
D Looker1, D Abbott-Brown, P Cozart
1Somatogen Inc., Boulder, Colorado 80301.
Nature
|March 19, 1992
まとめ
安全な血液代用品の開発は極めて重要です. この研究では,酸素の親和性が低下し,安定性が向上し,以前の試みの限界を克服し,腎臓の損傷を防ぐ新しいヒトヘモグロビンを設計しました.
科学分野:
- バイオケミストリー バイオケミストリー
- バイオテクノロジー バイオテクノロジー
- 血液学 ヘマトロジ
背景:
- 血液で伝染する病原体に対する懸念のため,血液代用品の緊急需要があります.
- 既存の細胞フリーヘモグロビン溶液は,酸素の排出と腎臓の毒性に関する課題に直面しています.
- E. coliとS. cerevisiaeで合成されたヘモグロビンは,また,限界を示しています.
研究 の 目的:
- 酸素運搬能力が向上し,毒性が低下した新しいヒトヘモグロビンを設計し,血液の代替品として使用する.
- 以前のヘモグロビンベースの酸素伝達体の高い酸素親和性および急速な腎クリアランスの問題に対処するために.
- 毒性ダイマーへの解離を防ぐ安定したヘモグロビン分子を開発する.
主な方法:
- ヒトのヘモグロビンを生成するための発現ベクトルを使用した.
- 酸素親和度が低下した変異性β-グロービンをコードする遺伝子を組み込みました.
- 安定性を高めるため,複製され,タンドームで融合したアルファグロービン遺伝子が含まれています.
- エンジニアリングされたヘモグロビンのインビボ半減期と腎臓クリアランスを調査しました.
主要な成果:
- 酸素親和性が低下したヒトのヘモグロビンを成功裏に生成した.
- 溶融したアルファグロービンのサブユニットは,アルファベータジマーへの解離を防止しました.
- エンジニアリングされたヘモグロビンは,半減期がin vivoで増加することを実証しました.
- ヘモグロビン解離に関連した腎的毒性の除去が観察されました.
結論:
- エンジニアリングされたヒトのヘモグロビンは,以前の血液代用品候補の限界を効果的に解決します.
- この新しいヘモグロビンは,酸素の親和性が低下し,安定性が向上し,有望な血液代用品となっています.
- ダイマー解離の予防は腎臓の毒性を軽減し,酸素供給のより安全な代替案を提供します.
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