Design and Construction of a Novel Humanized Single-Chain Variable-Fragment Antibody Against the Tumor Necrosis Factor Alpha
Author | Davoud Farajzadeh | en |
Author | Sadigheh Karimi-Gharigh | en |
Author | Parisa Jalali-Kondori | en |
Author | Siavoush Dastmalchi | en |
Issued Date | 2019-01-31 | en |
Abstract | The pro-inflammatory cytokine, TNF-α, which plays a major role in the development and persistence of diseases such as Crohn’s disease, psoriasis, psoriatic arthritis, and rheumatoid arthritis, is the basis for the use of anti-TNF-α therapies. The neutralization of TNF-α or blockage of its binding to the corresponding receptor has mainly served as a therapeutic strategy against some inflammatory diseases. This study aimed to investigate the production of a humanized single chain antibody (scFv) against TNF-α. Therefore, a murine monoclonal antibody, D2 mAb, was selected for humanizing by the complementarity determining region (CDR)-grafting method. Briefly, the replacement of the CDRs from D2 mAb with the specific human single chain scaffold led to the production of a novel humanized single chain fragment variable mAb against human TNF-α (hD2). The subsequent cloning of hD2 into a suitable expression vector, pGEX-6P-1, resulted in the expression of a 52-kDa GST-fusion protein in E. coli, mostly in the form of inclusion bodies. The solubilization and refolding of GST-hD2 inclusion bodies was achieved with the addition of 4 M urea and subsequent dialysis to recover the fusion protein in soluble form. Then the soluble GST-hD2 was purified by affinity chromatography through immobilized glutathione. The GST pull-down experiment showed a positive interaction between GST-hD2 and TNF-α protein. Moreover, the results of an MTT assay showed that the purified GST-hD2 has TNF-α neutralizing activity (Kd of 1.03 nM) and hence hD2 has the potential to be developed into a therapeutic agent. However, more investigation is needed to elucidate the potential of in-vivo TNF-α neutralizing activity of hD2 in comparison to other anti-TNF-α antibodies. | en |
DOI | https://doi.org/10.22037/ijpr.2019.2062 | en |
Keyword | TNF-α | en |
Keyword | Single chain antibody | en |
Keyword | Affinity chromatography | en |
Keyword | Pull down | en |
Keyword | MTT assay | en |
Publisher | Brieflands | en |
Title | Design and Construction of a Novel Humanized Single-Chain Variable-Fragment Antibody Against the Tumor Necrosis Factor Alpha | en |
Type | Original Article | en |
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