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Self-renewing cell populations such as hematopoietic stem cells and memory B and T lymphocytes might be regulated by shared signaling pathways. The Wnt-beta-catenin pathway is an evolutionarily conserved pathway that promotes hematopoietic stem cell self-renewal and multipotency by limiting stem cell proliferation and differentiation, but its role in the generation and maintenance of memory T cells is unknown. We found that induction of Wnt-beta-catenin signaling by inhibitors of glycogen sythase kinase-3beta or the Wnt protein family member Wnt3a arrested CD8(+) T cell development into effector cells. By blocking T cell differentiation, Wnt signaling promoted the generation of CD44(low)CD62L(high)Sca-1(high)CD122(high)Bcl-2(high) self-renewing multipotent CD8(+) memory stem cells with proliferative and antitumor capacities exceeding those of central and effector memory T cell subsets. These findings reveal a key role for Wnt signaling in the maintenance of 'stemness' in mature memory CD8(+) T cells and have major implications for the design of new vaccination strategies and adoptive immunotherapies.

Wnt signaling arrests effector T cell differentiation and generates CD8+ memory stem cells