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    • 8. 发明申请
    • Anti-CD19 Antibody, Immunotoxin and Treatment Method
    • 抗CD19抗体,免疫毒素和治疗方法
    • US20090220501A1
    • 2009-09-03
    • US12175368
    • 2008-07-17
    • Georg H. FeyMatthias PeippMichael SchwemmleinBruce WangMatthias Wabl
    • Georg H. FeyMatthias PeippMichael SchwemmleinBruce WangMatthias Wabl
    • A61K39/395C07K16/28
    • C07K16/2803A61K47/6829A61K47/6849C07K2317/56C07K2319/04C12N2799/026
    • Provided is an immunotoxin including (a) an anti-CD19 antibody lacking an Fc fragment, (b) a modified exotoxin A protein having both Domains II and III, but lacking Domain I, and (c) a peptide linker joining the C-terminal end of the antibody to the N-terminal end of the modified exotoxin A protein. The linker is substantially resistant to extracellular cleavage. The modified exotoxin A protein may be further modified to include a C-terminal KDEL sequence (SEQ ID NO: 6) that promotes transport of the protein to the endoplasmic reticulum of cells that have taken up the immunotoxin. Also provided is an anti-CD19 antibody having enhanced binding activity, antibody-dependent cellular cytotoxicity (ADCC) and methods for using the antibody to treat a disease state associated with B-lineage cells that express CD19. The antibody variable light and variable heavy chains have unique sequences in their J region relative to known anti-CD19 antibody sequences.
    • 本发明提供一种免疫毒素,其包括(a)缺少Fc片段的抗CD19抗体,(b)具有两个结构域II和III的修饰的外毒素A蛋白,但缺少结构域I,和(c)连接C-端的肽接头 抗体结合到修饰的外毒素A蛋白的N末端。 接头基本上抗细胞外切割。 修饰的外毒素A蛋白可以被进一步修饰以包括促进蛋白质转运到已经吸收免疫毒素的细胞的内质网的C-末端KDEL序列(SEQ ID NO:6)。 还提供了具有增强的结合活性,抗体依赖性细胞毒性(ADCC)的抗CD19抗体以及使用该抗体治疗与表达CD19的B系细胞相关的疾病状态的方法。 抗体可变轻链和可变重链相对于已知的抗CD19抗体序列在其J区具有独特的序列。