Modified factor viii

C - Chemistry – Metallurgy – 12 – N

Patent

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C12N 15/62 (2006.01) A61K 38/37 (2006.01) C07H 21/00 (2006.01) C07K 14/755 (2006.01) C12N 15/11 (2006.01) C12N 15/12 (2006.01) C12P 21/02 (2006.01) A61K 38/00 (2006.01)

Patent

CA 2322508

Specific amino acid loci of human factor VIII interact with inhibitory antibodies of hemophilia patients who have developed such antibodies after being treated with factor VIII. Modified factor VIII is disclosed in which the amino acid sequence is changed by a substitution at one or more of the specific loci. The modified factor VIII is not inhibited by inhibitory antibodies against the A2 or C2 domain epitopes. The modified factor VIII is useful for hemophiliacs, either to avoid or prevent the action of inhibitory antibodies.

Des loci spécifiques aminoacides du facteur humain antihémophilique A interagissent avec des anticorps inhibiteurs de patients hémophiles ayant développé ces anticorps après avoir été traités à l'aide de ce même facteur. L'invention a trait à un facteur antihémophilique A modifié dans lequel la séquence aminoacide est modifiée par une substitution sur un ou plusieurs loci spécifiques. Le facteur antihémophilique A modifié n'est pas inhibé par des anticorps inhibiteurs contre les épitopes du domaine A2 ou C2. Ce facteur antihémophilique A modifié est utile aux hémophiles, qu'il s'agisse de traiter ou de prévenir l'action d'anticorps inhibiteurs.

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