Abstract
Recombinant form of granulocyte colony stimulating factor (G-CSF) was first approved by FDA in 1998 for chemotherapy induced neutropenia. However, despite production of its biosimilars, less expensive production of G-CSF could reduce the overall therapeutic cost. The aim of this study was to evaluate the possibility of producing biologically active recombinant G-CSF via a single step purification procedure mediated by a self-cleavable intein. G-CSF was expressed by E. coli BL21 (DE3) through IPTG induction, followed by its purification using pH optimization on a chitin column. Western blotting, ELISA, size exclusion chromatography, circular diachorism, peptide mapping, and in vitro assays were performed to compare the structural similarity and biological activity of the purified G-CSF with Neupogen™. Protein purification was confirmed by revealing a band of approximately 18.8 kDa on SDS-PAGE. Bioactivity and physicochemical assays based on the US pharmacopeia showed almost identical or acceptable ranges of similarities between recombinant G-CSF and Neopogen™. this study, biologically active soluble recombinant G-CSF was successfully produced with high purity without using chaotropic solvents through a one-step procedure. This shorter and more efficient purification procedure can reduce the cost and time of G-CSF production which makes its industrial production more cost-effective and might be also applicable for production of other biopharmaceuticals.
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Acknowledgements
The authors are grateful to thank Ms. Fatemeh Moazen for her technical assistance. This work has been financially supported by the Research Deputy of Isfahan University of Medical Sciences via Grants Nos. 394698 and 195210.
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AJN and FS designed the study. SS performed the experiments. SS, FS and AJN analysed the results. SS and FS prepared first draft of the manuscript. AJN finalized and submitted the manuscript. AJN prepared the revised manuscript according to the reviewers comments and submitted the final revision.
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11033_2020_5404_MOESM1_ESM.jpg
Supplementary material 1 Supplementary Figure 1. G-CSF (Filgrastim) protein sequence retrieved from www.drugbank.ca (https://www.drugbank.ca/drugs/DB00099), in addition to some information on the protein characteristics. (JPEG 247 kb)
11033_2020_5404_MOESM2_ESM.jpg
Supplementary material 2 Supplementary Figure 2. Spectrum of the purified G-CSF following size-exclusion chromatography by FPLC. The purity of the recombinant G-CSF was confirmed by revealing a sharp signal in the spectrum (JPEG 359 kb)
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Sima, S., Shafiee, F. & Jahanian-Najafabadi, A. Expression and one step intein-mediated purification of biologically active human G-CSF in Escherichia coli. Mol Biol Rep 47, 2861–2869 (2020). https://doi.org/10.1007/s11033-020-05404-8
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DOI: https://doi.org/10.1007/s11033-020-05404-8