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Updated: May 7, 2026
Murine Superficial Lymph Node Surgery
Published on: May 21, 2012
Antigen availability determines CD8⁺ T cell-dendritic cell interaction kinetics and memory fate decisions
Sarah E Henrickson1, Mario Perro, Scott M Loughhead
1Division of Immunology, Department of Microbiology and Immunobiology, Harvard Medical School, Boston, MA 02115, USA.
Insights
T cell fate decisions, determining long-term memory or abortive responses, occur within hours of antigen exposure. This outcome depends on the kinetics of T cell-dendritic cell interactions, not solely on stable contacts.
Area of Science:
- Immunology
- Cellular Biology
- T cell activation
Background:
- T cell activation by dendritic cells (DCs) in lymph nodes occurs in phases.
- Stable DC-T cell contact (phase 2) was thought essential for T cell activation.
Purpose of the Study:
- To investigate if stable DC-T cell contacts are strictly necessary for T cell activation and memory formation.
- To understand the role of antigen dose and interaction kinetics in T cell fate determination.
Main Methods:
- Studied CD8+ T cell interactions with antigen-presenting DCs under varying antigen doses and interaction durations.
- Analyzed T cell proliferation, effector differentiation, transcriptome signatures, and memory development.
Main Results:
- Low-dose, short-lived antigen exposure prevented phase 2 transition but still induced proliferation and differentiation.
- High-dose antigen promoted phase 2 transition.
- Phase 2 interaction led to long-lived memory T cells, while transient interactions resulted in immunological amnesia.
- Transcriptome signatures differed significantly between phase 2 and non-phase 2 conditions at 12 and 24 hours.
Conclusions:
- T cell fate decisions (memory vs. abortive response) are made rapidly, within hours of antigen exposure.
- Interaction kinetics, specifically the duration and stability of DC-T cell contacts, critically influence T cell memory development.
- Stable DC-T cell interactions are not the sole determinant of T cell activation but are crucial for long-term memory formation.
Abstract:
T cells are activated by antigen (Ag)-bearing dendritic cells (DCs) in lymph nodes in three phases. The duration of the initial phase of transient, serial DC-T cell interactions is inversely correlated with Ag dose. The second phase, characterized by stable DC-T cell contacts, is believed to be necessary for full-fledged T cell activation. Here we have shown that this is not the case. CD8⁺ T cells interacting with DCs presenting low-dose, short-lived Ag did not transition to phase 2, whereas higher Ag dose yielded phase 2 transition. Both antigenic constellations promoted T cell proliferation and effector differentiation but yielded different transcriptome signatures at 12 hr and 24 hr. T cells that experienced phase 2 developed long-lived memory, whereas conditions without stable contacts yielded immunological amnesia. Thus, T cells make fate decisions within hours after Ag exposure, resulting in long-term memory or abortive effector responses, correlating with T cell-DCs interaction kinetics.
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