Antigen-Presenting Hybrid Colloidal Crystal Clusters for Promoting T cells Expansion

Area of Science:

• Biotechnology
• Immunology
• Materials Science

Background:

• T cell-based immunotherapy is a potent anti-tumor strategy, but clinical application faces challenges in therapeutic T cell expansion.
• Existing methods for ex vivo T cell expansion require optimization to meet clinical demands.

Purpose of the Study:

• To develop artificial antigen-presenting scaffolds for efficient ex vivo T cell expansion.
• To investigate the potential of these scaffolds in enhancing T cell proliferation and antitumor activity for clinical manufacturing.

Main Methods:

• Fabrication of antigen-presenting hybrid colloidal crystal clusters (HCCCs) with nanoporous structures.
• Encapsulation of prosurvival cytokines (e.g., IL-2) and surface decoration with activating antibodies (anti-CD3ε and anti-CD28).
• Evaluation of T cell expansion and antitumor activity following stimulation with HCCCs in vitro.

Main Results:

• Antigen-presenting HCCCs demonstrated high loading capacity and sustained release of IL-2.
• Direct and multiple stimulations using HCCCs significantly promoted T cell expansion.
• Expanded T cells exhibited robust in vitro antitumor activity.

Conclusions:

• Antigen-presenting HCCCs serve as an effective platform for T cell ex vivo expansion.
• This novel approach offers a promising solution for the clinical manufacturing of therapeutic T cells.
• HCCCs facilitate the generation of T cells with potent antitumor capabilities.