產品介紹細胞培養與分析細胞轉染試劑與電穿孔產品CHOgro® High Yield Expression System

CHOgro® High Yield Expression System

CHOgro® High Yield Expression System - Mirus Bio 台灣獨家代理伯森生技CHOgro® High Yield Expression System 是美國 Mirus Bio 公司為 CHO 細胞蛋白質量產實驗所開發的全新一代表現系統。相較於原本的 CHOgro® Expression System,新增加了獨家蛋白質表現增強劑「CHOgro® Titer Enhancer」。經實驗證實,CHOgro® High Yield Expression System 的蛋白質產率不僅勝過一代產品 CHOgro® Expression System,也能在培養 7 天後迅速表現出優於 ExpiCHO Expression System 的蛋白質產量。其產品優勢包含:

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產品效能

Fig. 1 | CHOgro® High Yield Expression System Streamlined Workflow. The CHOgro® High Yield Expression System was engineered to maximize transient protein production in suspension CHO cells, while still maintaining a simple and cost-effective workflow. The ability to add expression enhancers at the time of transfection and immediately shift cell cultures to hypothermic conditions provides researchers with more flexibility in the timing of their experiments while reducing the risk of contamination caused by repeated handling of the culture.

 

Fig. 2 | CHOgro® High Yield Expression System Results in Higher Protein Titers. The CHOgro® High Yield Expression System (MR-MIR6270) and the CHOgro® Expression System (MR-MIR6260) were compared for human IgG1 antibody production. Antibody was produced by transient transfection using the TransIT-PRO® Transfection Reagent (Mirus Bio) at a 1:1 reagent-to-DNA ratio (vol:wt) and 1 µg plasmid DNA per milliliter of culture. FreeStyle™ CHO-S cells (ThermoFisher Scientific) were cultured in CHOgro® Expression Medium (Mirus Bio) and plated at a density of 2 or 4 x 10⁶ cells/ml in non-treated 6-well plates (2ml/well) for transfection. As indicated, the CHOgro® High Yield culture was shifted to 32°C immediately post-addition of the transfection complexes to the culture. Day 10 supernatants were analyzed using a standard sandwich human IgG ELISA. Error bars represent the standard deviation of triplicate technical replicates.

 

Fig. 3 | The CHOgro® High Yield Expression System Outperforms the ExpiCHO Expression System Using Multiple Antibody Constructs. Six different IgG1 antibody constructs, including five therapeutically relevant constructs synthesized in the same vector backbone were produced by transient transfection using either the TransIT-PRO® Transfection Reagent (Mirus Bio) at a 1:1 reagent-to-DNA ratio (vol:wt) and 1 µg plasmid DNA per milliliter of culture in FreeStyle™ CHO-S cells (ThermoFisher Scientific) cultured in CHOgro® Expression Medium (Mirus Bio) at a cell density of 4 x 10⁶ cells/ml, or the Expifectamine CHO Transfection Kit (ThermoFisher Scientific) at a 3.2:1 reagent-to-DNA (vol:wt) and 1 µg plasmid DNA per milliliter of culture in ExpiCHO-S cells (ThermoFisher Scientific) cultured in ExpiCHO Expression Medium (ThermoFisher Scientific) at a cell density of 6 x 10⁶ cells/ml. All cells were split into 125 ml Optimum Growth flask (25 ml/flask, Thomson Instrument Company) at the time of transfection. The CHOgro® Titer Enhancer was added immediately post-addition of transfection complexes and the culture was incubated at 32°C shaking until harvest for the CHOgro® High Yield Expression System. The Max titer protocol was followed for the ExpiCHO Expression System (ThermoFisher Scientific): Expifectamine CHO Enhancer and Feed (ThermoFisher Scientific) were added at 24 hours post-transfection and cultures were shifted to 32°C. At Day 5 a second volume of the ExpiCHO Feed (ThermoFisher Scientific) was added to the flask. Day 7 and 14 supernatants were analyzed using a standard sandwich human IgG ELISA. Error bars represent the standard deviation of triplicate technical replicates.

 

Fig. 4 | FreeStyle™ CHO-S and ExpiCHO Cells Grown in CHOgro® Expression Medium Yield Similar Titers. FreeStyle™ CHO-S cells (ThermoFisher Scientific) or ExpiCHO-S cells (ThermoFisher Scientific) were cultured in CHOgro® Expression Medium (Mirus Bio). Both cell lines were transiently transfected with plasmid DNA encoding a human IgG1 internal control antibody, Bevacizumab or Fc-fusion construct using the TransIT-PRO® Transfection Reagent (Mirus Bio) at a 1:1 reagent-to-DNA ratio (vol:wt) and 1 µg plasmid DNA per milliliter of culture in a non-treated 6-well plate. All cultures were shifted to 32°C, shaking, immediately post-addition of the transfection complexes and the CHOgro® Titer Enhancer to the culture. Day 14 supernatants were analyzed using a standard sandwich human IgG ELISA. Error bars represent the standard deviation of triplicate technical replicates.

 

Fig. 5 | CHOgro® Titer Enhancer Does Not Adversely Affect Cell Growth and Viability Post-transfection. Triplicate flasks of FreeStyle™ CHO-S cells adapted to CHOgro® Expression Medium were transiently transfected with the TransIT-PRO® Transfection Reagent (Mirus Bio) at a 1:1 reagent-to-DNA ratio (vol:wt) and 1 µg plasmid DNA per milliliter of culture at 4 x 106 cells/ml in 125 ml Optimum Growth flasks (25 ml/flask, Thomson Instrument Company). As indicated, CHOgro® Titer Enhancer was added and all of the cultures were shifted to 32°C immediately post-addition of the transfection complexes to the culture. Cell counts (solid line) and viability (propidium iodide staining, dotted line) were measured daily post-transfection using a Guava® easyCyte™ 5HT flow cytometer (EMD Millipore).

 

Fig. 6 | CHOgro® High Yield Expression System Enables 1000-fold Scalability. Human IgG1 was produced by transient transfection with the TransIT-PRO® Transfection Reagent (Mirus Bio) and 1 µg plasmid DNA per milliliter of culture at a 1:1 reagent:DNA ratio. Freestyle CHO cells (Thermo Fisher Scientific) were transfected at a density of 4 x 10⁶ cells/ml in CHOgro® Expression Medium (Mirus Bio) at the following volumes/culture vessels: 2 ml/non-tissue culture treated 6-well dish, 20 ml/125 ml Thomson flask, 500 ml/1.6 L Thomson flask, 2000 ml/5 L Thomson flask. All cultures were shifted to 32°C, shaking, immediately post-addition of the transfection complexes and the CHOgro® Titer Enhancer to the culture. Cultures were maintained at the appropriate shake speed for the remainder of the experiment. Day 14 supernatants were analyzed using a standard sandwich human IgG ELISA. Error bars represent the standard deviation of triplicate technical replicates.

 

Fig. 7 | Titer Enhancement is Observed Using Multiple Fc-fusion Constructs. Two different Fc-fusion constructs were transiently transfected using the TransIT-PRO® Transfection Reagent (Mirus Bio) at a 1:1 reagent-to-DNA ratio (vol:wt) and 1 µg plasmid DNA per milliliter of culture. FreeStyle™ CHO-S (ThermoFisher Scientific) cells were cultured in CHOgro® Expression Medium (Mirus Bio) and plated at 4 x 10⁶ cells/ml at the time of transfection in non-treated 6-well plates (2 ml/well). As indicated, CHOgro® Titer Enhancer was added and the culture was shifted to 32°C immediately post-addition of the transfection complexes to the culture. Day 10 supernatants were analyzed using a standard sandwich human IgG ELISA. Error bars represent the standard deviation of triplicate technical replicates.

 

Fig. 8 | Higher Titers Achieved by Third Party with CHOgro® High Yield Expression System Plus CHOgro® Titer Enhancer. Fc-fusion proteins were produced by transient transfection of CHO-S cells in complete CHOgro® Media using TransIT-PRO® Transfection Reagent (1:1 reagent:DNA ratio, volume: weight). Cells were either 2 x 10⁶ cells/ml (no CHOgro® Titer Enhancer) or 4 x 10⁶ (with CHOgro® Titer Enhancer) for transfection. Cultures were shifted to 32°C either 24 hours (no CHOgro® Titer Enhancer) or immediately (with CHOgro® Titer Enhancer) following transfection. Yields represent final affinity-purified protein from 0.5 L culture, harvested at day 11 post-transfection.

 

Fig. 9 | TransIT-PRO® + CHOgro® Titer Enhancer Outperforms PEImax and linear 25 kDa PEI Transfection Reagents. An IgG1 antibody construct was produced by transient transfection using either the TransIT-PRO® Transfection Reagent (Mirus Bio) at a 1:1 reagent-to-DNA ratio (vol:wt), PEImax (4:1, Polysciences), or linear 25 kDa PEI (6:1, Polysciences) and 1 µg plasmid DNA per milliliter of culture in FreeStyle™ CHO-S cells (ThermoFisher Scientific) cultured in CHOgro® Expression Medium (Mirus Bio) at a cell density of 4 x 10⁶ cells/ml. CHOgro® Titer Enhancer (Mirus Bio) was added immediately post-addition of transfection complexes and cultures were incubated at 32°C with shaking until harvest for all reagents. Day 14 supernatants were analyzed using a standard sandwich human IgG ELISA. Error bars represent the standard deviation of triplicate technical replicates.

訂購資訊

Product Name Pack Size Cat. No.
CHOgro® High Yield Expression System
Kit includes: CHOgro® Expression Medium (2 x 1 L), CHOgro® Complex Formation Solution (100 ml), L-Glutamine (100 ml), Poloxamer 188 Solution (100 ml), TransIT-PRO® Transfection Reagent (1 ml), CHOgro® Titer Enhancer (20 ml)
1 Kit MR-MIR6270
CHOgro® Transfection and Titer Enhancer Kit
Kit includes: TransIT-PRO® Transfection Reagent (1 ml), CHOgro® Titer Enhancer (20 ml)
1 Kit MR-MIR6225
CHOgro® Expression Medium 1 Liter MR-MIR6200
10 Liter Polybag MR-MIR6202
Dry Powder, Prepares 10 Liters MR-MIR6201
CHOgro® Complex Formation Solution 100 ml MR-MIR6210
TransIT-PRO® Transfection Reagent 1 ml MR-MIR5740
10 ml MR-MIR5750
Poloxamer 188 Solution, 10% 100 ml MR-MIR6230
L-Glutamine Solution, 200 mM 100 ml MR-MIR6240
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