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Transient Expression and Cellular Localization of Recombinant Proteins in Cultured Insect Cells
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Large scale transient expression with COS cells.

H D Blasey1, J P Aubry, G J Mazzei

  • 1Glaxo Institute for Molecular Biology, 14 Chemin des Aulx, CH-1228, Plan-les-Ouates, Switzerland.

Cytotechnology
|February 24, 2012
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Summary
This summary is machine-generated.

Transient expression in COS cells scaled up to one litre successfully produces milligram quantities of CD40-Fc protein. This simplified protocol enables rapid protein generation within weeks of gene cloning.

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Area of Science:

  • Biotechnology
  • Mammalian cell culture
  • Protein expression

Background:

  • Transient gene expression is crucial for rapid protein production.
  • Scaling up transient expression systems presents challenges in maintaining cell viability and productivity.
  • Optimized protocols are needed for efficient, large-scale production of recombinant proteins.

Purpose of the Study:

  • To demonstrate the feasibility of scaling up transient expression in COS cells to the one-litre scale.
  • To optimize culture conditions for extended cell viability and protein production.
  • To develop a simplified and cost-effective protocol for milligram-scale protein generation.

Main Methods:

  • COS cells were cultured in T225 flasks, transfected via electroporation, and transferred to spinner flasks for suspension or microcarrier culture.
  • Daily medium changes were implemented to prolong culture lifespan and production time.
  • Protein production was initiated in serum-containing medium and transitioned to a low-protein, serum-free medium for simplified downstream processing.

Main Results:

  • Transient expression was successfully scaled to the one-litre level, maintaining culture for over 10 days.
  • CD40-Fc fusion protein concentrations were comparable between suspension and microcarrier cultures.
  • A yield of 30 mg of purified, biologically active CD40-Fc protein was obtained from 10 litres of supernatant.
  • Reduced material requirements for electroporation were achieved.

Conclusions:

  • Scale-up of transient expression in COS cells to the litre scale is achievable and efficient.
  • The optimized protocol allows for the generation of milligram quantities of protein within weeks of gene cloning.
  • This method offers a valuable tool for rapid recombinant protein production.