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Regulation of antitumour CD8 T-cell immunity and checkpoint blockade immunotherapy by Neuropilin-1.

Marine LeclercElodie VoilinGwendoline GrosStephanie CorgnacVincent de MontprévillePierre ValidireGeorges BismuthFathia Mami-Chouaib
Published in: Nature communications (2019)
Neuropilin-1 (Nrp-1) is a marker for murine CD4+FoxP3+ regulatory T (Treg) cells, a subset of human CD4+ Treg cells, and a population of CD8+ T cells infiltrating certain solid tumours. However, whether Nrp-1 regulates tumour-specific CD8 T-cell responses is still unclear. Here we show that Nrp-1 defines a subset of CD8+ T cells displaying PD-1hi status and infiltrating human lung cancer. Interaction of Nrp-1 with its ligand semaphorin-3A inhibits migration and tumour-specific lytic function of cytotoxic T lymphocytes. In vivo, Nrp-1+PD-1hi CD8+ tumour-infiltrating lymphocytes (TIL) in B16F10 melanoma are enriched for tumour-reactive T cells exhibiting an exhausted state, expressing Tim-3, LAG-3 and CTLA-4 inhibitory receptors. Anti-Nrp-1 neutralising antibodies enhance the migration and cytotoxicity of Nrp-1+PD-1hi CD8+ TIL ex vivo, while in vivo immunotherapeutic blockade of Nrp-1 synergises with anti-PD-1 to enhance CD8+ T-cell proliferation, cytotoxicity and tumour control. Thus, Nrp-1 could be a target for developing combined immunotherapies.
Keyphrases
  • endothelial cells
  • cell proliferation
  • induced apoptosis
  • nk cells
  • cell cycle arrest
  • dna damage
  • cell death
  • regulatory t cells
  • induced pluripotent stem cells
  • oxidative stress
  • peripheral blood
  • pluripotent stem cells