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Related Experiment Videos

Eukaryotic expression systems: a comparison

S Geisse1, H Gram, B Kleuser

  • 1Sandoz Pharma Ltd., Basel, Switzerland.

Protein Expression and Purification
|November 1, 1996
PubMed
Summary

Choosing the right eukaryotic expression system is key for producing recombinant proteins like human Leukemia Inhibitory Factor (hu-LIF). Stably transfected cells yield fully glycosylated hu-LIF, while transient systems offer rapid production of biologically active protein.

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Area of Science:

  • Biotechnology
  • Molecular Biology
  • Protein Expression

Background:

  • Eukaryotic expression systems are crucial for producing recombinant proteins for therapeutics and research.
  • Common systems include Chinese Hamster Ovary (CHO) cells, lymphoid cell lines, insect cells using baculoviruses, and transient mammalian cell expression (e.g., COS cells).
  • Selection depends on protein properties, experimental needs, and required yield.

Purpose of the Study:

  • To compare the expression of human Leukemia Inhibitory Factor (hu-LIF) in five common eukaryotic systems.
  • To outline the principles and characteristics of each evaluated expression system.

Main Methods:

  • Expression of hu-LIF in Chinese Hamster Ovary (CHO), Sp2/0, Mouse Erythroleukemia (MEL), COS cells, and insect cells.

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  • Utilized stable transfection for CHO, Sp2/0, and MEL cells.
  • Employed transient expression in COS cells and baculovirus-mediated expression in insect cells.

    • Main Results:

    • Stably transfected cell lines (CHO, Sp2/0, MEL) produced fully glycosylated hu-LIF with variable titers.
    • Transient expression in COS cells and baculovirus-mediated insect cell expression rapidly produced incompletely glycosylated but biologically active hu-LIF.
    • Different systems yielded distinct glycosylation patterns and production speeds.

    Conclusions:

    • The choice of expression system significantly impacts the glycosylation status and production efficiency of recombinant hu-LIF.
    • Stable cell lines are suitable for high yields of fully glycosylated protein.
    • Transient and baculovirus systems offer rapid production of biologically active, albeit incompletely glycosylated, protein.