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Preferential localization of effector memory cells in nonlymphoid tissue
D Masopust1, V Vezys, A L Marzo
1Division of Immunology, Department of Medicine, University of Connecticut Health Center, Farmington, CT 06030, USA.
Antigen-specific CD8 T cells establish long-lived memory in nonlymphoid tissues. These extralymphoid memory T cells display immediate effector functions, enhancing immune surveillance against intracellular pathogens.
Area of Science:
- Immunology
- Cellular Biology
- Infectious Diseases
Background:
- Intracellular pathogens infect diverse tissues, yet T cell immunity at these sites remains poorly understood.
- Current knowledge of T cell responses primarily stems from lymphoid tissue analyses, limiting insights into extralymphoid immunity.
Purpose of the Study:
- To investigate the presence and function of CD8 T cells in nonlymphoid tissues during infection.
- To determine if memory CD8 T cells in nonlymphoid tissues possess distinct effector capabilities.
Main Methods:
- Tracking antigen-specific CD8 T cells following viral or bacterial infection.
- Analysis of CD8 T cell populations in both lymphoid (spleen) and nonlymphoid tissues.
- Ex vivo assessment of lytic activity in isolated CD8 memory T cells.
Main Results:
- Antigen-specific CD8 T cells were found to migrate to and persist as long-lived memory cells in nonlymphoid tissues.
- CD8 memory T cells from nonlymphoid tissues exhibited potent effector lytic activity ex vivo.
- Splenic CD8 memory T cells showed significantly lower lytic activity compared to their nonlymphoid counterparts.
Conclusions:
- A distinct population of extralymphoid effector memory T cells exists.
- These extralymphoid T cells are pre-activated and ready for immediate response upon re-exposure to pathogens.
- This finding highlights the critical role of nonlymphoid tissues in maintaining robust cellular immunity.
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