Cytotoxic Granzyme C-expressing ILC1s Contribute to Antitumor Immunity and Neonatal Autoimmunity
Overview
Authors
Affiliations
Innate lymphocytes are integral components of the cellular immune system that can coordinate host defense against a multitude of challenges and trigger immunopathology when dysregulated. Natural killer (NK) cells and innate lymphoid cells (ILCs) are innate immune effectors postulated to functionally mirror conventional cytotoxic T lymphocytes and helper T cells, respectively. Here, we showed that the cytolytic molecule granzyme C was expressed in cells with the phenotype of type 1 ILCs (ILC1s) in mouse liver and salivary gland. Cell fate-mapping and transfer studies revealed that granzyme C-expressing innate lymphocytes could be derived from ILC progenitors and did not interconvert with NK cells, ILC2s, or ILC3s. Granzyme C defined a maturation state of ILC1s. These granzyme C-expressing ILC1s required the transcription factors T-bet and, to a lesser extent, Eomes and support from transforming growth factor-β (TGF-β) signaling for their maintenance in the salivary gland. In a transgenic mouse breast cancer model, depleting ILC1s caused accelerated tumor growth. ILC1s gained granzyme C expression following interleukin-15 (IL-15) stimulation, which enabled perforin-mediated cytotoxicity. Constitutive activation of STAT5, a transcription factor regulated by IL-15, in granzyme C-expressing ILC1s triggered lethal perforin-dependent autoimmunity in neonatal mice. Thus, granzyme C marks a cytotoxic effector state of ILC1s, broadening their function beyond "helper-like" lymphocytes.
Autocrine TGF-β1 drives tissue-specific differentiation and function of resident NK cells.
Sparano C, Solis-Sayago D, Zangger N, Rindlisbacher L, Van Hove H, Vermeer M J Exp Med. 2024; 222(3).
PMID: 39692745 PMC: 11654236. DOI: 10.1084/jem.20240930.
GPR34 is a metabolic immune checkpoint for ILC1-mediated antitumor immunity.
Yan J, Zhang C, Xu Y, Huang Z, Ye Q, Qian X Nat Immunol. 2024; 25(11):2057-2067.
PMID: 39358444 DOI: 10.1038/s41590-024-01973-z.
Shen G, Wang Q, Li Z, Xie J, Han X, Wei Z Int J Biol Sci. 2024; 20(12):4799-4818.
PMID: 39309440 PMC: 11414386. DOI: 10.7150/ijbs.96338.
Fasting reshapes tissue-specific niches to improve NK cell-mediated anti-tumor immunity.
Delconte R, Owyong M, Santosa E, Srpan K, Sheppard S, McGuire T Immunity. 2024; 57(8):1923-1938.e7.
PMID: 38878769 PMC: 11684419. DOI: 10.1016/j.immuni.2024.05.021.
Distinct developmental pathways generate functionally distinct populations of natural killer cells.
Ding Y, Lavaert M, Grassmann S, Band V, Chi L, Das A Nat Immunol. 2024; 25(7):1183-1192.
PMID: 38872000 DOI: 10.1038/s41590-024-01865-2.