Multifunctional nanorods serving as nanobridges to modulate T cell-mediated immunity

Area of Science:

• Biomaterials Engineering
• Immunology
• Nanotechnology

Background:

• Developing novel biomaterials for modulating immune cell interactions is crucial for immunotherapy.
• Nanomaterials offer unique properties for targeted immune cell engagement and activation.

Purpose of the Study:

• To fabricate and characterize electrodeposited nanorods as multivalent bridges for immune cells.
• To investigate the effect of nanorod length and surface functionalization on immune cell proximity and cytokine release.

Main Methods:

• Sequential electrodeposition of gold and nickel on anodized templates to create bisegmented nanorods.
• Surface immobilization of mannose and RGD peptides for immune cell recruitment.
• Confocal microscopy and variable pressure scanning electron microscopy for visualizing cell-nanorod interactions.
• Quantification of cytokine release (Interleukin-2, Interferon-γ) from co-cultured dendritic cells and T cells.

Main Results:

• Successfully fabricated gold-nickel nanorods with varying lengths (1-4 μm).
• Longer nanorods (4 μm) promoted immune cell association and bridging, while shorter ones were endocytosed.
• Nanorod length significantly correlated with cytokine release, with 4 μm nanorods inducing the highest levels.
• Facilitated antigen presentation and increased immune cell proximity.

Conclusions:

• Electrodeposited nanorods can act as effective bridges to enhance immune cell proximity and interaction.
• Nanorod length is a critical parameter influencing immune cell recruitment and subsequent cytokine production.
• This nanobridging system shows promise for applications in immunotherapy and modulating immune responses.