Abstract:
:Memory T cell inflation is a process in which a subset of cytomegalovirus (CMV) specific CD8 T cells continuously expands mainly during latent infection and establishes a large and stable population of effector memory cells in peripheral tissues. Here we set out to identify in vivo parameters that promote and limit CD8 T cell inflation in the context of MCMV infection. We found that the inflationary T cell pool comprised mainly high avidity CD8 T cells, outcompeting lower avidity CD8 T cells. Furthermore, the size of the inflationary T cell pool was not restricted by the availability of specific tissue niches, but it was directly related to the number of virus-specific CD8 T cells that were activated during priming. In particular, the amount of early-primed KLRG1- cells and the number of inflationary cells with a central memory phenotype were a critical determinant for the overall magnitude of the inflationary T cell pool. Inflationary memory CD8 T cells provided protection from a Vaccinia virus challenge and this protection directly correlated with the size of the inflationary memory T cell pool in peripheral tissues. These results highlight the remarkable protective potential of inflationary CD8 T cells that can be harnessed for CMV-based T cell vaccine approaches.
journal_name
PLoS Pathogjournal_title
PLoS pathogensauthors
Baumann NS,Welten SPM,Torti N,Pallmer K,Borsa M,Barnstorf I,Oduro JD,Cicin-Sain L,Oxenius Adoi
10.1371/journal.ppat.1007785subject
Has Abstractpub_date
2019-05-13 00:00:00pages
e1007785issue
5eissn
1553-7366issn
1553-7374pii
PPATHOGENS-D-18-02243journal_volume
15pub_type
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