Engineering early memory B-cell-like phenotype in hydrogel-based immune organoids.

Area of Science:

• Immunology
• Biomaterials Science
• Synthetic Biology

Background:

• Memory B cells are crucial for adaptive immunity, originating in germinal centers after antigenic stimulation.
• Current understanding relies heavily on mouse models, with limited ex vivo engineering of memory B cells.
• Biomaterials-based platforms for B cell growth and differentiation are underexplored.

Purpose of the Study:

• To characterize maleimide-functionalized poly(ethylene glycol) (PEG) hydrogels as immune organoids.
• To investigate the ex vivo induction of early memory B-cell phenotype and germinal center-like B cells.
• To explore the potential of synthetic organoids for generating antigen-specific memory B cells.

Main Methods:

• Utilized maleimide-functionalized PEG hydrogels as immune organoids.
• Incorporated interleukin 9 (IL9), IL21, and bacterial antigen presentation.
• Cultured naive, primary murine B cells within the engineered hydrogel system.

Main Results:

• Demonstrated the successful development of early memory B-cell phenotype in ex vivo immune organoids.
• Showcased the induction of germinal center-like B cells within the synthetic platform.
• Confirmed the role of IL9, IL21, and bacterial antigen presentation in driving B cell conversion.

Conclusions:

• Synthetic immune organoids can effectively induce an early memory B-cell-like phenotype ex vivo.
• PEG-based hydrogels provide a viable platform for studying B cell development and engineering.
• This approach holds promise for future development of antigen-specific memory B cells and therapeutic antibodies.