Methods and Process Optimization for Large-Scale CAR T Expansion Using the G-Rex Cell Culture Platform.

Area of Science:

• Biotechnology
• Cell Culture Technology
• Bioprocessing

Background:

• Conventional bioreactors for mammalian cell expansion face challenges in oxygen delivery, often requiring complex and failure-prone mechanisms.
• These limitations increase costs and risks associated with large-scale cell culture.
• A need exists for simpler, more robust, and cost-effective cell expansion platforms.

Purpose of the Study:

• To describe the methods and concepts for optimizing cell expansion using the G-Rex bioreactor platform.
• To highlight the advantages of gas-permeable membrane technology in cell culture.
• To demonstrate the scalability and efficiency of the G-Rex system for various cell types.

Main Methods:

• Utilized the G-Rex cell culture platform, which employs a gas-permeable membrane for oxygen and nutrient exchange.
• Cultured various cell types, including CAR-T and NK cells, in static G-Rex bioreactors.
• Focused on optimizing expansion parameters for high-density cell yields without complex interventions.

Main Results:

• The G-Rex platform facilitates high-density cell expansion (e.g., 20-30 × 10^6 cells/cm^2 for CAR-T and NK cells) within 9-14 days.
• Achieved maximum cell densities without the need for media exchange or complex oxygenation systems.
• Demonstrated a linear scalability from research to commercial production volumes.

Conclusions:

• The G-Rex bioreactor, leveraging gas-permeable membrane technology, provides a physiologically advantageous and robust platform for mammalian cell expansion.
• This system simplifies cell culture processes, reduces costs, and minimizes risks associated with conventional bioreactors.
• The G-Rex platform is a scalable solution for achieving high cell densities essential for research and therapeutic applications.