Optimization of canine interleukin-12 production using a baculovirus insect cell expression system Biotechnology

Cristiane Garboggini Melo De Pinheiro*, Mayara De Oliveira Pedrosa, Naiara Carvalho Teixeira, Ana Paula Dinis Ano Bom, Monique M. Van Oers, Geraldo Gileno de Sá Oliveira

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

Abstract

Background: Interleukin-12 is an important cytokine in mediating cellular immune responses. Results: Recombinant single-chain canine IL-12 was produced in a baculovirus-insect cell system with the aim of conducting further studies on modulation of immune responses in dogs. To optimize the production of recombinant canine IL-12, a classical baculovirus and a modified vector (chitinase A and v-cathepsin knockout) were used containing a native or an optimized insert of canine IL-12. The optimized IL-12 construct contained the GP64 signal peptide and was synthesized with optimized codons for expression in Trichoplusia ni cells. Dot-blot and Western blot analysis showed the highest production levels of recombinant IL-12 protein by the use of the modified baculovirus vector containing the optimized insert, at a multiplicity of infection of five and at 48 h after infection. The recombinant cytokine was successfully purified and showed a good degree of purity, integrity, folding, and yield, with very little endotoxin contamination. Recombinant canine IL-12 induced IFN-γ in canine lymphocytes, indicating that it was biologically active. Conclusion: Therefore, this study describes an efficient method to produce adequate amounts of biologically active canine IL-12, useful for immunomodulation studies in dogs.

Original languageEnglish
Article number36
JournalBMC Research Notes
Volume9
DOIs
Publication statusPublished - 22 Jan 2016

Keywords

  • Baculovirus
  • Dog
  • Interleukin-12
  • Protein expression optimization

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