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    • 9. 发明申请
    • FVIII-INDEPENDENT FIX-MUTANT PROTEINS FOR HEMOPHILIA A TREATMENT
    • 用于HEMOPHILIA治疗的FVIII独立固定蛋白
    • US20110206655A1
    • 2011-08-25
    • US13096894
    • 2011-04-28
    • Dockal MichaelHartmann RudolfScheiflinger Friedrich
    • Dockal MichaelHartmann RudolfScheiflinger Friedrich
    • A61K38/48C12N9/50C07H21/00C12N15/63C12N5/10A61P7/04A61P7/00
    • C12N9/644A61K38/00C12Y304/21022
    • The present invention relates to recombinant blood coagulation factor IX (rFIX) mutants having factor VIII (FVIII) independent factor X (FX) activation potential. Five full length FIX proteins with combinations of mutations of amino acids important for functional activity of FIX and FIX wild type were cloned and expressed in HEK 293 cells. The proteins were tested by an activated partial thromboplastin time (aPTT) assay in FVIII-depleted plasma as well as in FVIII-inhibited patient plasma. In FVIII-depleted plasma functional activity of the FIX mutants was calculated as increased FVIII equivalent activity. The mutant proteins had increased FVIII equivalent activity. In FVIII-inhibited patient plasma the FEIBA equivalent activity was calculated for analysis of FVIII independent FX activation potential. The proteins had also increased FEIBA equivalent activity. Furthermore, the pre-activated FIX proteins had an increased activity in FIX-depleted plasma containing FVIII inhibitors. Therefore these FIX mutants are alternatives as bypassing agents for treatment of FVIII inhibitor patients.
    • 本发明涉及具有因子VIII(FVIII)独立因子X(FX)活化电位的重组凝血因子IX(rFIX)突变体。 在HEK 293细胞中克隆并表达具有FIX和FIX野生型功能活性重要的氨基酸突变组合的五个全长FIX蛋白。 通过在FVIII消除的血浆以及FVIII抑制的患者血浆中的活化部分凝血活酶时间(aPTT)测定来测试蛋白质。 在FVIII消耗的血浆中,FIX突变体的功能活性被计算为增加的FVIII当量活性。 突变蛋白具有增加的FVIII当量活性。 在FVIII抑制的患者血浆中,计算FEIBA等效活性以分析FVIII独立的FX激活电位。 蛋白质也增加了FEIBA等效活性。 此外,预活化的FIX蛋白在含有FVIII抑制剂的FIX耗尽血浆中具有增加的活性。 因此,这些FIX突变体是用于治疗FVIII抑制剂患者的旁路药物的替代物。