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Expand to shield: IL-15 and in situ lymphocytic proliferation

Authors
  • Bindea, Gabriela1, 2, 3
  • Mlecnik, Bernhard1, 2, 3, 4
  • Galon, Jérôme1, 2, 3
  • 1 INSERM, France , (France)
  • 2 Equipe Labellisée Ligue Contre le Cancer, France , (France)
  • 3 Sorbonne Université, Université de Paris, France , (France)
  • 4 Inovarion, France , (France)
Type
Published Article
Journal
OncoImmunology
Publisher
Landes Bioscience
Publication Date
Feb 12, 2021
Volume
10
Issue
1
Identifiers
DOI: 10.1080/2162402X.2021.1886726
PMID: 33628626
PMCID: PMC7889171
Source
PubMed Central
Keywords
License
Green

Abstract

The tumor microenvironment includes a complex network of cytokines and chemokines that contribute to shaping the intratumoral immune reaction. Understanding the mechanisms leading to immune-hot (Immunoscore-high) altered (excluded and immunosuppressed) and cold tumors are of critical importance for successful anti-cancer therapies. Two essential mechanisms are highlighted. Specific chemokines and adhesion molecules appeared to target and attract immune effector T cells to the tumor microenvironment and to specific regions within the tumor. These mechanisms are dependent upon intratumoral IL-15 expression. Decreased IL15 expression also affected the local proliferation of B and T lymphocytes. A comprehensive analysis revealed a major contribution of IL15 in shaping the tumor immune contexture. Thus, an in situ lymphocytic infiltration is mediated through chemokines and attraction inside or around the tumor microenvironment, and an IL15-mediated in situ lymphocytic proliferation, which expand the local pool of intratumoral cytotoxic CD8 T-cells are key determinants of the immune contexture. Increased IL15 expression and local proliferation of T-cells were associated with decreased risk of tumor recurrence and prolonged survival of cancer patients. These data provide further mechanisms to prioritize research and help in designing better therapeutic interventions.

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