T cell decision-making decodes the dynamic antigenic landscape

Area of Science:

• Immunology
• Cellular Biology
• Systems Biology

Background:

• Adaptive immune system encounters diverse antigens.
• Existing research often treats the antigenic environment as static.
• Antigen levels dynamically fluctuate in real biological systems.

Purpose of the Study:

• To review how antigen presentation dynamics influence T cell activation and fate.
• To explore mechanisms enabling T cells to sense antigen concentration changes.
• To discuss implications for immune tolerance, activation, and memory.

Main Methods:

• Review of theoretical and experimental evidence on T cell signaling dynamics.
• Analysis of cellular and molecular mechanisms (e.g., kinetic proofreading, feedback circuits).
• Examination of T cell responses across various timescales (seconds to days).

Main Results:

• T cells are sensitive to both antigen quantity and its rate of change.
• Mechanisms like kinetic proofreading and feedback circuits allow dynamic sensing.
• Antigen dynamics impact immune tolerance, activation, and memory formation.

Conclusions:

• T cell responses are shaped by antigen presentation dynamics.
• Manipulating antigen exposure dynamics can modulate immune responses.
• Incorporating temporal features into models can enhance understanding of immune decision-making and therapies.