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CD45RB Status of CD8+ T Cell Memory Defines T Cell Receptor Affinity and Persistence

Cell Rep. 2020; 
Krummey SM, Morris AB, Jacobs JR, McGuire DJ, Ando S, Tong KP, Zhang W, Robertson J, Guasch SA, Araki K, Larsen CP, Evavold BD, Kissick HT, Ford ML.
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Abstract

The identity of CD45 isoforms on the T cell surface changes following the activation of naive T cells and impacts intracellular signaling. In this study, we find that the anti-viral memory CD8+ T pool is unexpectedly comprised of both CD45RBhi and CD45RBlo populations. Relative to CD45RBlo memory T cells, CD45RBhi memory T cells have lower affinity and display greater clonal diversity, as well as a persistent CD27hi phenotype. The CD45RBhi memory population displays a homeostatic survival advantage in vivo relative to CD45RBlo memory, and long-lived high-affinity cells that persisted long term convert from CD45RBlo to CD45RBhi. Human CD45RO+ memory is comprised of both CD45RBhi and CD45RBlo populations wit... More

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