In vitro and in vivo antitumor effect of a trivalent bispecific antibody targeting ErbB2 and CD16

In vitro and in vivo antitumor effect of a trivalent bispecific antibody targeting ErbB2 and CD16
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靶向 ErbB2 和 CD16 的三价双特异性抗体的体外和体内抗肿瘤作用

DOI:
10.4161/cbt.7.11.6725
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发表时间:
2008-11
影响因子:
3.6
通讯作者:
--
中科院分区:
医学3区
文献类型:
--
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为了优化双特异性抗体(BsAb)的结构并最大限度地降低其毒性,我们开发了三价抗ErbB2/抗CD16 BsAb。该 BsAb 具有三个抗原结合位点,其中两个以 scFv 形式的抗原结合位点靶向过度表达 ErbB2 的肿瘤细胞,以及一个重定向 NK 细胞的单价 Fab 片段。该 BsAb 的关键在于其在体外和体内触发效应细胞细胞毒性的能力。在本研究中,我们证明,BsAb 能够与 SKBR3 细胞上的 ErbB2 胞外结构域结合,即使在低浓度下也能有效引导效应细胞对 SKBR3 细胞的细胞毒活性。 BsAb对SKBR3细胞比对MCF-7细胞更有效,表明对肿瘤细胞的杀伤依赖于细胞表面ErbB2分子的密度。此外,在细胞毒性测定和 SKOV3 异种移植动物中,BsAb 比抗 ErbB2 单链抗体 (scFv)-Fc 融合蛋白更有效。功效的提高表明,BsAb 对于进一步修饰和优化对于治疗微小残留病中的恶性细胞可能是有价值的。
In order to optimize the structure of bispecific antibody (BsAb) and minimize its toxicity, we developed a trivalent anti-ErbB2/anti-CD16 BsAb. This BsAb possesses three antigen binding sites, two antigen binding sites in the form of scFvs targeting the tumor cells overexpressing ErbB2 and a monovalent Fab fragment redirecting NK cells. Critical for this BsAb is its capacity to trigger cytotoxicity of the effector cells in vitro and in vivo. In the present study, we demonstrated that the BsAb is capable of binding to ErbB2 extracellular domain on SKBR3 cells and effectively direct the cytotoxic activities of effector cells to SKBR3 cells even at a low concentration. The BsAb was more effective to SKBR3 cells than to MCF-7 cells, indicating that the killing of tumor cells was dependent on the density of ErbB2 molecules on cell surface. Furthermore, the BsAb was more potent than anti-ErbB2 single chain antibody (scFv)-Fc fusion proteins in the cytotoxicity assay and in SKOV3 xenograft animals. Improved efficacy demonstrates that the BsAb may be valuable to be further modified and optimized for the treatment of malignant cells in a minimal residual disease.
DOI: 10.1200/jco.1995.13.9.2281
发表时间: 1995-09
期刊: Journal of clinical oncology : official journal of the American Society of Clinical Oncology
影响因子: --
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F. Valone;P. Kaufman;P. Guyre;L. Lewis;V. Memoli;Y. Deo;R. Graziano;J. Fisher;L. Meyer;M. Mrozek-Orlowski
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发表时间: 1976-09
影响因子: 3.1
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DOI: 10.1016/0090-1229(85)90049-2
发表时间: 1985-09
期刊: Clinical immunology and immunopathology
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发表时间: 1996-03
期刊: Cancer Immunology, Immunotherapy
影响因子: --
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期刊: Cancer research
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