Protective function and durability of mouse lymph node-resident memory CD8+ T cells.
Elife
; 102021 06 18.
Article
in En
| MEDLINE
| ID: mdl-34143731
ABSTRACT
Protective lung tissue-resident memory CD8+T cells (Trm) form after influenza A virus (IAV) infection. We show that IAV infection of mice generates CD69+CD103+and other memory CD8+T cell populations in lung-draining mediastinal lymph nodes (mLNs) from circulating naive or memory CD8+T cells. Repeated antigen exposure, mimicking seasonal IAV infections, generates quaternary memory (4M) CD8+T cells that protect mLN from viral infection better than 1M CD8+T cells. Better protection by 4M CD8+T cells associates with enhanced granzyme A/B expression and stable maintenance of mLN CD69+CD103+4M CD8+T cells, vs the steady decline of CD69+CD103+1M CD8+T cells, paralleling the durability of protective CD69+CD103+4M vs 1M in the lung after IAV infection. Coordinated upregulation in canonical Trm-associated genes occurs in circulating 4M vs 1M populations without the enrichment of canonical downregulated Trm genes. Thus, repeated antigen exposure arms circulating memory CD8+T cells with enhanced capacity to form long-lived populations of Trm that enhance control of viral infections of the mLN.
Key words
Full text:
1
Database:
MEDLINE
Main subject:
CD8-Positive T-Lymphocytes
/
Lymph Nodes
Limits:
Animals
Language:
En
Journal:
Elife
Year:
2021
Type:
Article
Affiliation country:
United States