Modulating T Cell Activation Using Depth Sensing Topographic Cues.

Area of Science:

• Biotechnology
• Immunology
• Materials Science

Background:

• T cell activation is a critical step in the adaptive immune response.
• The native interface between T cells and antigen-presenting cells involves microscale topography.
• Modulating T cell activation through physical cues is an area of interest for therapeutic applications.

Purpose of the Study:

• To investigate how sensing of substrate topography influences T cell activation.
• To explore the relationship between micro-pit dimensions and T cell response.
• To assess the potential of microscale topography for enhancing T cell production for immunotherapy.

Main Methods:

• Fabrication of planar substrates with micrometer-scale pits of varying depths.
• Culturing primary CD4+ T cells on these patterned substrates.
• Measuring T cell activation via secretion of cytokines (interleukin-2 and interferon gamma).
• Assessing the role of cell contractility in the observed responses.

Main Results:

• T cells extend actin-rich protrusions into micropits.
• T cell activation shows a biphasic dependence on micropit depth, with 4 μm pits enhancing response.
• Deeper micropits (beyond 4 μm) resulted in reduced T cell activation.
• Inhibition of cell contractility abolished the enhancement in T cell activation.

Conclusions:

• 3D microscale topography can be effectively used to modulate and enhance T cell activation.
• The findings suggest a tunable physical control over T cell responses.
• This approach holds promise for improving the production of T cells for immunotherapy.