title: Co-expression of proteinase inhibitor enhances recombinant human granulocyte-macrophage colony stimulating factor production in transgenic rice cell suspension culture.
abstract: The synthetic gene (sPI-II) harboring the chymotrypsin (C1) and trypsin (T1) inhibitor domains of the Nicotiana alata serine proteinase inhibitor II gene has been previously expressed, and extracellular protease activity was shown to be reduced in the suspension culture medium. In this study, the sPI-II gene was introduced into transgenic rice cells expressing rhGM-CSF (recombinant human granulocyte-macrophage colony-stimulating factor), in an effort to reduce protease activity and increase rhGM-CSF accumulation in the suspension culture medium. The integration and expression of the introduced sPI-II gene in the transgenic rice cells were verified via genomic DNA PCR amplification and Northern blot analysis, respectively. Relative protease activity was found to have been reduced and rhGM-CSF production was increased 2-fold in the co-transformed cell suspension culture with rhGM-CSF and the sPI-II gene, as compared with that observed in the transformed cell suspension culture expressing rhGM-CSF only. These results indicate that a transformed plant cell suspension culture system expressing the proteinase inhibitor can be a useful tool for increasing recombinant protein production.
authors.affiliation: Division of Biological Sciences, Chonbuk National University, Dukjindong 664-14, Jeonju, Chonbuk 561-756, Republic of Korea.
authors.forename: Tae-Geum
authors.initials: TG
authors.lastname: Kim
authors.forename: Ho-Jin
authors.initials: HJ
authors.lastname: Lee
authors.forename: Yong-Suk
authors.initials: YS
authors.lastname: Jang
authors.forename: Yun-Ji
authors.initials: YJ
authors.lastname: Shin
authors.forename: Tae-Ho
authors.initials: TH
authors.lastname: Kwon
authors.forename: Moon-Sik
authors.initials: MS
authors.lastname: Yang
mesh_terms: D015152:Blotting, Northern; D018929:Cell Culture Techniques; D017077:Culture Media, Conditioned / Q000737:chemistry / Q000378:metabolism; D004789:Enzyme Activation / Q000235:genetics; D015870:Gene Expression; D005822:Genetic Vectors / Q000235:genetics; D016178:Granulocyte-Macrophage Colony-Stimulating Factor / Q000096:biosynthesis / Q000235:genetics* / Q000302:isolation & purification; D006801:Humans; D012275:Oryza / Q000166:cytology / Q000235:genetics* / Q000378:metabolism; D030821:Plants, Genetically Modified / Q000166:cytology / Q000235:genetics* / Q000378:metabolism; D016133:Polymerase Chain Reaction / Q000379:methods; D011994:Recombinant Proteins; D015842:Serine Proteinase Inhibitors / Q000096:biosynthesis / Q000235:genetics*; D013997:Time Factors; D014026:Nicotiana / Q000235:genetics; D014170:Transformation, Genetic / Q000235:genetics
chemical_list: D017077:Culture Media, Conditioned; D011994:Recombinant Proteins; D015842:Serine Proteinase Inhibitors; D016178:Granulocyte-Macrophage Colony-Stimulating Factor