Differential localization of effector and memory CD8 T cell subsets in lymphoid organs during acute viral infection

YW Jung, RL Rutishauser, NS Joshi… - The Journal of …, 2010 - journals.aai.org
The Journal of Immunology, 2010journals.aai.org
It is unclear where within tissues subsets of effector and memory CD8 T cells persist during
viral infection and whether their localization affects function and long-term survival.
Following lymphocytic choriomeningitis virus infection, we found most killer cell lectin-like
receptor G1 (KLRG1) lo IL-7R hi effector and memory cells, which are long-lived and high
proliferative capacity, in the T cell zone of the spleen. In contrast, KLRG1 hi IL-7R lo cells,
which appear terminally differentiated and have shorter life spans, were exclusively …
Abstract
It is unclear where within tissues subsets of effector and memory CD8 T cells persist during viral infection and whether their localization affects function and long-term survival. Following lymphocytic choriomeningitis virus infection, we found most killer cell lectin-like receptor G1 (KLRG1) lo IL-7R hi effector and memory cells, which are long-lived and high proliferative capacity, in the T cell zone of the spleen. In contrast, KLRG1 hi IL-7R lo cells, which appear terminally differentiated and have shorter life spans, were exclusively localized to the red pulp. KLRG1 lo IL-7R hi T cells homed to the T cell zone using pertussis toxin-sensitive chemokine receptors and appeared to contact gp38+ stromal cells, which produce the chemokines CCL19 and CCL21 and the T cell survival cytokine IL-7. The transcription factors T-bet and B lymphocyte-induced maturation protein-1 controlled effector CD8 T cell splenic migration. Effector CD8 T cells overexpressing T-bet homed to the red pulp, whereas those lacking B lymphocyte-induced maturation protein-1 homed to the T cell zone. Upon memory formation, CD62L+ memory T cells were predominantly found in the T cell zone, whereas CD62L− cells were found in the red pulp. Thus, effector and memory CD8 T cell subset localization within tissues is linked to their differentiation states, and this may identify anatomical niches that regulate their longevity and homeostasis.
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