Ca²⁺-Mediated Surface Polydopamine Engineering to Program Dendritic Cell Maturation.

Area of Science:

• Biomaterials Science
• Cellular Engineering
• Immunology

Background:

• Cell surface engineering offers physicochemical control over cellular functions.
• Existing methods require complex biological or chemical approaches.
• Dendritic cells (DCs) play a crucial role in immune responses and their maturation is a key target.

Purpose of the Study:

• To develop a rapid, cytocompatible method for engineering dendritic cell surfaces.
• To demonstrate bidirectional control over DC maturation using surface-modified DCs.
• To explore the potential of polydopamine nanostructures for cell surface modification.

Main Methods:

• In situ growth of polydopamine nanostructures on dendritic cell surfaces within 10 minutes, mediated by Ca²⁺.
• Utilizing Ca²⁺ as a physical bridge to ensure cell viability during surface engineering.
• Investigating the effect of polydopamine surface engineering on DC maturation, including suppression and laser-induced activation.

Main Results:

• Polydopamine surface engineering effectively controlled dendritic cell (DC) maturation.
• The engineered DCs showed suppressed activation due to polydopamine's reactive oxygen species scavenging.
• Remote activation of DC maturation was achieved using 808 nm laser irradiation via polydopamine's photo-thermal effect.

Conclusions:

• A straightforward and efficient cell surface engineering approach was established using polydopamine nanostructures.
• This method provides bidirectional control over dendritic cell maturation, enabling suppression and activation.
• The technique holds promise for applications in immunology and regenerative medicine requiring precise control of immune cells.