Conventional type I dendritic cells maintain a reservoir of proliferative tumor-antigen specific TCF-1+ CD8+ T cells in tumor-draining lymph nodes

Immunity. 2021 Oct 12;54(10):2338-2353.e6. doi: 10.1016/j.immuni.2021.08.026. Epub 2021 Sep 16.

Abstract

In tumors, a subset of CD8+ T cells expressing the transcription factor TCF-1 drives the response to immune checkpoint blockade. We examined the mechanisms that maintain these cells in an autochthonous model of lung adenocarcinoma. Longitudinal sampling and single-cell sequencing of tumor-antigen specific TCF-1+ CD8+ T cells revealed that while intratumoral TCF-1+ CD8+ T cells acquired dysfunctional features and decreased in number as tumors progressed, TCF-1+ CD8+ T cell frequency in the tumor draining LN (dLN) remained stable. Two discrete intratumoral TCF-1+ CD8+ T cell subsets developed over time-a proliferative SlamF6+ subset and a non-cycling SlamF6- subset. Blocking dLN egress decreased the frequency of intratumoral SlamF6+ TCF-1+ CD8+ T cells. Conventional type I dendritic cell (cDC1) in dLN decreased in number with tumor progression, and Flt3L+anti-CD40 treatment recovered SlamF6+ T cell frequencies and decreased tumor burden. Thus, cDC1s in tumor dLN maintain a reservoir of TCF-1+ CD8+ T cells and their decrease contributes to failed anti-tumor immunity.

Keywords: CD8 T cells; Flt3L; T cell dysfunction; TCF-1+; anti-CD40; migratory cDC1; single-cell RNA-seq; tumor immunology; tumor-draining lymph node.

Publication types

  • Research Support, N.I.H., Extramural
  • Research Support, Non-U.S. Gov't
  • Research Support, U.S. Gov't, Non-P.H.S.

MeSH terms

  • Adenocarcinoma of Lung / immunology*
  • Animals
  • CD8-Positive T-Lymphocytes / immunology*
  • Dendritic Cells / immunology*
  • Lung Neoplasms / immunology*
  • Lymph Nodes / immunology*
  • Mice
  • T Cell Transcription Factor 1 / immunology*
  • T-Lymphocyte Subsets / immunology

Substances

  • T Cell Transcription Factor 1