High-level expression of functional recombinant human coagulation factor VII in insect cells

Area of Science:

• Biotechnology
• Molecular Biology
• Protein Expression

Background:

• Recombinant coagulation factor VII (FVII) is crucial for hemophilia patients with inhibitors.
• Mammalian cell lines offer low expression, while baculovirus systems lack essential vitamin K-dependent carboxylase for functional FVII.
• Current methods face challenges in achieving high-level expression of functional FVII.

Purpose of the Study:

• To develop a method for high-level expression of functional recombinant coagulation factor VII (FVII) in Spodoptera frugiperda Sf9 cells.
• To overcome the deficiency of endogenous vitamin K-dependent carboxylase in the baculovirus expression system.
• To enable efficient production of therapeutic FVII for hemophilia treatment.

Main Methods:

• Co-expression of human gamma-carboxylase (hGC) and human FVII genes in Sf9 insect cells.
• Utilizing the baculovirus expression system for simultaneous gene delivery and expression.
• Developing a versatile method applicable to other vitamin K-dependent proteins.

Main Results:

• Successful high-level expression of functional recombinant coagulation FVII achieved in Sf9 cells.
• Demonstrated a viable strategy to circumvent the lack of endogenous carboxylase activity.
• Established a robust system for producing therapeutic recombinant proteins.

Conclusions:

• The co-expression of hGC and FVII genes in Sf9 cells provides an effective solution for producing functional recombinant FVII.
• This method offers a promising approach for the future expression of other vitamin K-dependent coagulation factors.
• The developed system enhances the potential for therapeutic interventions in hemophilia.