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Construction, expression, and function of 6B11ScFv–mIL-12, a fusion protein that attacks human ovarian carcinoma

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Abstract

We previously produced an anti-idiotypic monoclonal antibody, 6B11, which mimics ovarian cancer antigen CA166-9 and induces cellular and humoral immunity. Here, to enhance the immunogenicity of 6B11, we constructed the 6B11ScFv–mIL-12 fusion protein (FP), by fusing single-chain fragment of 6B11 variable region (6B11ScFv) with mouse interleukin-12 (mIL-12), which was expressed in eukaryotic 293EBNA cells transfected with pSBI vectors. A binding activity assay showed 6B11ScFv–mIL-12 to have activities of both 6B11 and mIL-12—it specifically bound both ovarian monoclonal antibody COC166-9 and rabbit anti-mouse IL-12 antibody. The immune activity assay showed 6B11ScFv–mIL-12 to promote proliferation of lymphocytes stimulated by phytohemagglutinin, increase the absolute numbers and percentages of CD3/CD56+ natural killer cells and CD3+/CD56+ natural killer T cells among peripheral lymphocytes, and increase interferon-γ. The FP was specifically cytotoxic to the CA166-9+ ovarian cancer cell lines HOC1A and SKOV3 and inhibited growth of ID8 subcutaneous tumors in C57BL/6J mice. This study provides an experimental basis for clinical use of 6B11ScFv–mIL-12 in ovarian cancer therapy. To our knowledge, this is the first report of a fusion protein from an anti-idiotypic antibody and IL-12.

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Acknowledgments

This work was supported by the National Natural Science Foundation of China (NSFC, Grant No. 30901748) and the National High Technology Research and Development Program (863 Program, Grant No. 2012AA02A507).

Conflict of interest

The authors have declared that no conflict of interests exists.

Ethical standard

We declare that all human and animal studies have been approved by the Institutional Review Board of Peking University People’s Hospital when we applied for the National Natural Science Foundation of China project and therefore been performed in accordance with the ethical standards laid down in the 1964 Declaration of Helsinki and its later amendments. Human peripheral blood mononuclear cells (PBMCs) were provided by the blood donation volunteers of the Blood Center of the Beijing Red Cross, and all volunteers gave their informed written consent prior to their inclusion in the study. Details that might disclose the identity of the subject under study have been omitted.

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Correspondence to Heng Cui or Jianli Sang.

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Heng Cui and Jianli Sang have contributed equally to this work.

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Cheng, H., Ye, X., Chang, X. et al. Construction, expression, and function of 6B11ScFv–mIL-12, a fusion protein that attacks human ovarian carcinoma. Med Oncol 32, 130 (2015). https://doi.org/10.1007/s12032-015-0586-y

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