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    • 6. 发明授权
    • Activated protein C variants with normal cytoprotective activity but reduced anticoagulant activity
    • 具有正常细胞保护活性但具有降低的抗凝血活性的活化蛋白C变体
    • US09192657B2
    • 2015-11-24
    • US11589371
    • 2006-10-30
    • John H. GriffinLaurent O. MosnierAndrew J. Gale
    • John H. GriffinLaurent O. MosnierAndrew J. Gale
    • A61K38/48C12N9/64
    • A61K38/4866C12N9/6464C12Y304/21069
    • Variants (mutants) of recombinant activated protein C (APC) or recombinant protein C (prodrug, capable of being converted to APC) that have substantial reductions in anticoagulant activity but that retain normal levels of anti-apoptotic activity are provided. Three examples of such recombinant APC mutants are KKK191-193AAA-APC, RR229/230AA-APC, and RR229/230AA plus KKK191-193AAA-APC. APC variants and prodrugs of the invention have the desirable property of being cytoprotective (anti-apoptotic effects), while having significantly reduced risk of bleeding. The invention also provides a method of using the APC variants or prodrugs of the invention to treat subjects who will benefit from APC's cytoprotective activities that are independent of APC's anticoagulant activity. These subjects include patients at risk of damage to blood vessels or tissue in various organs caused, at least in part, by apoptosis. At risk patients include, for example, those suffering (severe) sepsis, ischemia/reperfusion injury, ischemic stroke, acute myocardial infarction, acute or chronic neurodegenerative diseases, or those undergoing organ transplantation or chemotherapy, among other conditions. Methods of screening for variants of recombinant protein C or APC that are useful in accordance with the invention are also provided.
    • 提供重组活化蛋白C(APC)或重组蛋白C(前体药物,能够转化为APC)的变体(突变体),其具有显着降低抗凝血活性,但保持正常水平的抗凋亡活性。 这些重组APC突变体的三个实例是KKK191-193AAA-APC,RR229 / 230AA-APC和RR229 / 230AA加上KKK191-193AAA-APC。 本发明的APC变体和前药具有细胞保护性(抗凋亡作用)的期望性质,同时具有显着降低的出血风险。 本发明还提供了使用本发明的APC变体或前药来治疗受益于APC的细胞保护活性而不受APC抗凝活性影响的受试者的方法。 这些受试者包括至少部分地通过细胞凋亡而导致各种器官的血管损伤或组织损伤风险的患者。 在危险中,患者包括例如患有(严重)败血症,缺血/再灌注损伤,缺血性卒中,急性心肌梗死,急性或慢性神经变性疾病或经历器官移植或化疗的患者等。 还提供了筛选根据本发明有用的重组蛋白C或APC的变体的方法。