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Levin G, Koga BAA, Belchior GG, Carreira ACO, Sogayar MC. Production, purification and characterization of recombinant human R-spondin1 (RSPO1) protein stably expressed in human HEK293 cells. BMC Biotechnol 2020; 20:5. [PMID: 31959207 PMCID: PMC6971977 DOI: 10.1186/s12896-020-0600-0] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/05/2019] [Accepted: 01/13/2020] [Indexed: 02/07/2023] Open
Abstract
Background The R-Spondin proteins comprise a family of secreted proteins, known for their important roles in cell proliferation, differentiation and death, by inducing the Wnt pathway. Several studies have demonstrated the importance of RSPOs in regulation of a number of tissue-specific processes, namely: bone formation, skeletal muscle tissue development, proliferation of pancreatic β-cells and intestinal stem cells and even cancer. RSPO1 stands out among RSPOs molecules with respect to its potential therapeutic use, especially in the Regenerative Medicine field, due to its mitogenic activity in stem cells. Here, we generated a recombinant human RSPO1 (rhRSPO1) using the HEK293 cell line, obtaining a purified, characterized and biologically active protein product to be used in Cell Therapy. The hRSPO1 coding sequence was synthesized and subcloned into a mammalian cell expression vector. HEK293 cells were stably co-transfected with the recombinant expression vector containing the hRSPO1 coding sequence and a hygromycin resistance plasmid, selected for hygror and subjected to cell clones isolation. Results rhRSPO1 was obtained, in the absence of serum, from culture supernatants of transfected HEK293 cells and purified using a novel purification strategy, involving two sequential chromatographic steps, namely: heparin affinity chromatography, followed by a molecular exclusion chromatography, designed to yield a high purity product. The purified protein was characterized by Western blotting, mass spectrometry and in vitro (C2C12 cells) and in vivo (BALB/c mice) biological activity assays, confirming the structural integrity and biological efficacy of this human cell expression system. Furthermore, rhRSPO1 glycosylation analysis allowed us to describe, for the first time, the glycan composition of this oligosaccharide chain, confirming the presence of an N-glycosylation in residue Asn137 of the polypeptide chain, as previously described. In addition, this analysis revealing the presence of glycan structures such as terminal sialic acid, N-acetylglucosamine and/or galactose. Conclusion Therefore, a stable platform for the production and purification of recombinant hRSPO1 from HEK293 cells was generated, leading to the production of a purified, fully characterized and biologically active protein product to be applied in Tissue Engineering.
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Affiliation(s)
- Gabriel Levin
- Cell and Molecular Therapy Center (NUCEL), Medical School, University of São Paulo, Edifício NUCEL, Rua Pangaré, 100 (Cidade Universitária), São Paulo, SP, 05360-130, Brazil
| | - Bruna Andrade Aguiar Koga
- Cell and Molecular Therapy Center (NUCEL), Medical School, University of São Paulo, Edifício NUCEL, Rua Pangaré, 100 (Cidade Universitária), São Paulo, SP, 05360-130, Brazil.,Department of Surgery, School of Veterinary Medicine and Animal Science, University of Sao Paulo, Sao Paulo, SP, 13635-900, Brazil
| | - Gustavo Gross Belchior
- Cell and Molecular Therapy Center (NUCEL), Medical School, University of São Paulo, Edifício NUCEL, Rua Pangaré, 100 (Cidade Universitária), São Paulo, SP, 05360-130, Brazil
| | - Ana Claudia Oliveira Carreira
- Cell and Molecular Therapy Center (NUCEL), Medical School, University of São Paulo, Edifício NUCEL, Rua Pangaré, 100 (Cidade Universitária), São Paulo, SP, 05360-130, Brazil. .,Department of Surgery, School of Veterinary Medicine and Animal Science, University of Sao Paulo, Sao Paulo, SP, 13635-900, Brazil.
| | - Mari Cleide Sogayar
- Cell and Molecular Therapy Center (NUCEL), Medical School, University of São Paulo, Edifício NUCEL, Rua Pangaré, 100 (Cidade Universitária), São Paulo, SP, 05360-130, Brazil. .,Biochemistry Department, Chemistry Institute, University of São Paulo, Sao Paulo, SP, 05508-000, Brazil.
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Siner JI, Samelson-Jones BJ, Crudele JM, French RA, Lee BJ, Zhou S, Merricks E, Raymer R, Nichols TC, Camire RM, Arruda VR. Circumventing furin enhances factor VIII biological activity and ameliorates bleeding phenotypes in hemophilia models. JCI Insight 2016; 1:e89371. [PMID: 27734034 DOI: 10.1172/jci.insight.89371] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
Processing by the proprotein convertase furin is believed to be critical for the biological activity of multiple proteins involved in hemostasis, including coagulation factor VIII (FVIII). This belief prompted the retention of the furin recognition motif (amino acids 1645-1648) in the design of B-domain-deleted FVIII (FVIII-BDD) products in current clinical use and in the drug development pipeline, as well as in experimental FVIII gene therapy strategies. Here, we report that processing by furin is in fact deleterious to FVIII-BDD secretion and procoagulant activity. Inhibition of furin increases the secretion and decreases the intracellular retention of FVIII-BDD protein in mammalian cells. Our new variant (FVIII-ΔF), in which this recognition motif is removed, efficiently circumvents furin. FVIII-ΔF demonstrates increased recombinant protein yields, enhanced clotting activity, and higher circulating FVIII levels after adeno-associated viral vector-based liver gene therapy in a murine model of severe hemophilia A (HA) compared with FVIII-BDD. Moreover, we observed an amelioration of the bleeding phenotype in severe HA dogs with sustained therapeutic FVIII levels after FVIII-ΔF gene therapy at a lower vector dose than previously employed in this model. The immunogenicity of FVIII-ΔF did not differ from that of FVIII-BDD as a protein or a gene therapeutic. Thus, contrary to previous suppositions, FVIII variants that can avoid furin processing are likely to have enhanced translational potential for HA therapy.
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Affiliation(s)
- Joshua I Siner
- The Children's Hospital of Philadelphia, Philadelphia, Pennsylvania, USA
| | - Benjamin J Samelson-Jones
- The Children's Hospital of Philadelphia, Philadelphia, Pennsylvania, USA.,Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania, USA
| | - Julie M Crudele
- The Children's Hospital of Philadelphia, Philadelphia, Pennsylvania, USA.,Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania, USA
| | - Robert A French
- The Children's Hospital of Philadelphia, Philadelphia, Pennsylvania, USA.,Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania, USA
| | - Benjamin J Lee
- The Children's Hospital of Philadelphia, Philadelphia, Pennsylvania, USA
| | - Shanzhen Zhou
- The Children's Hospital of Philadelphia, Philadelphia, Pennsylvania, USA
| | | | - Robin Raymer
- University of North Carolina, Chapel Hill, North Carolina, USA
| | | | - Rodney M Camire
- The Children's Hospital of Philadelphia, Philadelphia, Pennsylvania, USA.,Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania, USA
| | - Valder R Arruda
- The Children's Hospital of Philadelphia, Philadelphia, Pennsylvania, USA.,Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania, USA
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