A Microgel-Based Platform for Tunable Expansion and Function of γδ T-cells

Area of Science:

• Immunology
• Biotechnology
• Materials Science

Background:

• Current gamma delta (γδ) T-cell expansion methods often compromise cell function for higher yields.
• The influence of activation context, including biochemical signals and substrate mechanics, on γδ T-cell expansion and function is not fully understood.

Purpose of the Study:

• To investigate the impact of tunable alginate microgels, functionalized with specific antibodies, on γδ T-cell activation, expansion, and functionality.
• To compare microgel-mediated expansion with conventional methods like soluble antibodies and TransAct beads.
• To establish a platform for engineering γδ T-cells with enhanced therapeutic potential.

Main Methods:

• Utilized alginate microgels functionalized with anti-CD3 and co-stimulatory antibodies (αCD28 or αCD2).
• Compared microgel-mediated γδ T-cell expansion with soluble antibodies and TransAct beads.
• Assessed γδ T-cell expansion, differentiation state, expression of key markers (NKG2D, IFN-γ, TNF-α), and cytotoxic activity.

Main Results:

• Microgels significantly enhanced γδ T-cell expansion compared to soluble antibodies.
• The microgel system allowed controlled tuning of γδ T-cell differentiation states.
• Microgel-expanded γδ T-cells showed higher expression of NKG2D, IFN-γ, and TNF-α, and exhibited superior cytotoxicity against tumor targets.
• The platform revealed donor-specific differences in stimulation requirements.

Conclusions:

• Tunable alginate microgels provide an effective platform for γδ T-cell expansion, improving both yield and functionality.
• This approach enhances cytotoxic activity and allows for controlled differentiation, offering improved therapeutic potential.
• The microgel system facilitates a deeper understanding of γδ T-cell activation dynamics and donor variability.