Intratumoral antigen signaling traps CD8+ T cells to confine exhaustion to the tumor site.

Abstract:: Immunotherapy advances have been hindered by difficulties in tracking the behaviors of lymphocytes after antigen signaling. Here, we assessed the behavior of T cells active within tumors through the development of the antigen receptor signaling reporter (AgRSR) mouse, fate-mapping lymphocytes responding to antigens at specific times and locations. Contrary to reports describing the ready egress of T cells out of the tumor, we find that intratumoral antigen signaling traps CD8+ T cells in the tumor. These clonal populations expand and become increasingly exhausted over time. By contrast, antigen-signaled regulatory T cell (Treg) clonal populations readily recirculate out of the tumor. Consequently, intratumoral antigen signaling acts as a gatekeeper to compartmentalize CD8+ T cell responses, even within the same clonotype, thus enabling exhausted T cells to remain confined to a specific tumor tissue site.

Authors:: M Takahashi, TY So, V Chamberlain-Evans, R Hughes, JC Yam-Puc, K Kania, M Ruhle, T Mann, MJ Schuijs, P Coupland, D Naisbitt, TYF Halim, PA Lyons, P Lio, R Roychoudhuri, K Okkenhaug, DJ Adams, KGC Smith, DI Jodrell, MA Chapman, JED Thaventhiran

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