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Learn MorePersistent exposure to high levels of antigen results in the progressive exhaustion of T cells and has been thought to preclude the formation of memory. In contrast to the latter assumption, we show here that tumor-specific CD8 T cells residing in the tumor microenvironment include a Tcf1 expressing sub population that has key characteristics of central memory cells, lack an effector cell signature but display hallmarks of exhausted T cells, including the expression co-inhibitory receptors such as PD1. Similar memory-like cells are identified in melanoma patients. Preclinical mouse models reveal that the expansion of tumor-specific CD8 T cells, the production of terminally differentiated exhausted CD8 T cells and sustained tumor control in response to therapeutic vaccination or immune checkpoint blockade critically depends on the presence of these memory-like CD8 T cells. Tumor immune responses thus harbor tumor resident memory-like CD8 T cell populations, which can be therapeutically targeted to improve immune control of cancer. SOURCE: Sandra CalderonLausanne Genomics Technologies Facility University of Lausanne
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