Tumors Exploit Dedicated Intracellular Vesicles to Program T cell Responses
Roberts, E. W.; Ruhland, M. K.; Cai, E.; Mujal, A. M.; Marchuk, K.; Beppler, C.; Nam, D.; Serwas, N. K.; Binnewies, M.; Krummel, M. F.
10.1101/691873 bioRxivShow abstract
In order to drive productive tumor-infiltrating lymphocyte (TIL) function, myeloid populations must direct antigens to the lymph node, including to resident antigen-presenting cells (APCs) that have never touched the tumor. It has long been supposed that APCs trade antigens with one another, but the dominant cell biology underlying that remains unknown. We used in vitro and in vivo assays together with lattice light sheet and multiphoton imaging to show that myeloid cells carry tumor antigen-laden vesicles that they trade with one another as they reach distant sites. This accounts for the majority of antigen displayed to T cells and provides tumors with a mechanism to access APCs that differentially direct T cell activation away from memory phenotypes. This work defines efficient cell biology that drives the first steps of TIL generation and represents a new frontier for engineering tumoral immunity.
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