[Construction of anti-VEGFR-2 IgG1 like human antibody and its expression in CHO-k cells]

Yao Xue Xue Bao. 2013 Oct;48(10):1544-9.
[Article in Chinese]

Abstract

Anti-angiogenesis mechanism plays a vital role in tumor targeting immunotherapy. Based on the amino acid sequence of an anti-VEGFR-2 scFv-Fc fusion antibody (AK404R-Fc), this article is aimed to generate an anti-VEGFR-2 human IgG1-like full length antibody (Mab-04). Firstly, the light chain (L-chain) and heavy chain (H-chain) were obtained by overlap PCR and then linked to eukaryotic expression vector pcDNA3.1, separately. The recombinant plasmids (pcDNA3.1-L-chain and pcDNA3.1-H-chain) were then co-transfected into CHO-k cells using liposome transient transfection. Subsequently, Mab-04 antibody was expressed and purified by Protein A affinity chromatography. Western blotting was applied to identify the expression of Mab-04 and its affinity was detected by ELISA assay. DNA sequencing revealed the successful construction of recombinant plasmids and Western blotting assay proved the successful expression of full-length antibody (1 microg x mL(-1)). Finally, ELISA assay illustrated that the binding of the antibody to its antigen was in a concentration-dependent manner (IC50: 50 nmol x L(-1)). These outcomes above indicated that Mab-04 was successfully expressed and assembled, which laid the foundation for further preparation and antineoplastic activity study.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Animals
  • Antibodies, Monoclonal, Humanized / analysis*
  • CHO Cells
  • Cricetulus
  • Genetic Vectors
  • Immunoglobulin Fc Fragments / genetics
  • Immunoglobulin G / genetics
  • Immunoglobulin G / immunology
  • Plasmids
  • Recombinant Fusion Proteins / analysis
  • Recombinant Fusion Proteins / genetics
  • Single-Chain Antibodies / genetics
  • Transfection
  • Vascular Endothelial Growth Factor Receptor-2 / genetics
  • Vascular Endothelial Growth Factor Receptor-2 / immunology*

Substances

  • Antibodies, Monoclonal, Humanized
  • Immunoglobulin Fc Fragments
  • Immunoglobulin G
  • Recombinant Fusion Proteins
  • Single-Chain Antibodies
  • Vascular Endothelial Growth Factor Receptor-2