Accelerating HIV-1 VLP production using stable High Five insect cell pools.

Area of Science:

• Biotechnology
• Cell Line Development
• Protein Production

Background:

• Stable cell pools are emerging as a viable alternative to traditional clonal cell lines for recombinant protein production.
• They offer advantages such as shorter development timelines and higher product yields.
• This study investigates their application for producing both simple proteins and complex virus-like particles (VLPs).

Purpose of the Study:

• To evaluate the efficacy of stable High Five cell pools for producing mCherry protein and HIV-1 Gag-eGFP virus-like particles (VLPs).
• To optimize the generation of stable cell pools using random integration and fluorescence-activated cell sorting (FACS).
• To assess the scalability and performance of these cell pools in bioreactor conditions.

Main Methods:

• Stable High Five cell pools were generated using random integration and FACS for enrichment of high-producing cells.
• The methodology was adapted for suspension culture and scaled up to bioreactor systems.
• Production of mCherry and HIV-1 Gag-eGFP VLPs was assessed, along with cell growth, VLP yield, and metabolic activity.

Main Results:

• The methodology successfully generated stable cell pools for mCherry and HIV-1 Gag-eGFP VLP production.
• Bioreactor cultivation led to a 2-fold increase in VLP yields compared to shake flasks.
• Maximum viable cell concentration improved by 1.5-fold, with reduced by-product formation and increased amino acid uptake observed in Gag-eGFP VLP-producing cells.

Conclusions:

• Stable High Five cell pools represent a robust and efficient system for VLP and recombinant protein production.
• The optimized methodology, including FACS enrichment and bioreactor scale-up, enhances production yields and cell performance.
• This approach provides a strong foundation for future large-scale production studies.