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The Korean Society for Biotechnology and Bioengineering (한국생물공학회)
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Enhanced Production of hCTLA4Ig through Increased Permeability in Transgenic Rice Cell Cultures

형질전환 벼 현탁세포 배양에서 투과성 증진을 통한 hCTLA4Ig의 생산성 증대

  • Choi, Hong-Yeol (Department of Biological Engineering, Inha University) ;
  • Cheon, Su-Hwan (Department of Life Science, Gachon University) ;
  • Kwon, Jun-Young (Department of Biological Engineering, Inha University) ;
  • Lim, Jung-Ae (Department of Biological Engineering, Inha University) ;
  • Park, Hye-Rim (Department of Biological Engineering, Inha University) ;
  • Kim, Dong-Il (Department of Biological Engineering, Inha University)
  • Received : 2016.08.31
  • Accepted : 2016.12.21
  • Published : 2016.12.31
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Abstract

In this system, rice cells were genetically modified to express human cytotoxic T-lymphocyte antigen 4-immunoglobulin (hCTLA4Ig) using RAmy3D promoter induced by sugar depletion. Even though the target protein fused with signal sequence peptide, plant cell wall can be a barrier against secretion of recombinant proteins. Therefore, hCTLA4Ig can be trapped inside cell wall or remained in intracellular space. In this study, to enhance the secretion of hCTLA4Ig from cytoplasm and cell walls into the medium, permeabilizing agents, such as dimethyl sulfoxide (DMSO), Triton X-100 and Tween 20, were applied in transgenic rice cell cultures. When 0.5% (v/v) of DMSO was added in sugar-free medium, intracellullar hCTLA4Ig was increased, on the other hand, the secreted extracellular hCTLA4Ig was lower than that of control. DMSO did not give permeable effects on transgenic rice cell cultures. And Triton X-100 was toxic to rice cells and also did not give enhancing permeability of cells. When 0.05% (v/v) Tween 20 was added in rice cell cultures, however, intracellular hCTLA4Ig was lower than that of control cultures. And the maximum 44.76 mg/L hCTLA4Ig was produced for 10 days after induction, which was 1.4-fold increase compared to that of control cultures. Especially, Tween 20 at 0.05% (v/v) showed the positive effect on the secretion of hCTLA4Ig though the decrease of intracellular hCTLA4Ig. Also, Tween 20 as a non-toxic surfactant did not affect the cell growth, cell viability and protease activity. In conclusion, secretion of hCTLA4Ig could be increased by enhancing permeability of cells regardless of the cell growth, cell viability and protease activity.

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References

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