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Updated: Aug 7, 2025
Development and Functional Characterization of Murine Tolerogenic Dendritic Cells
Published on: May 18, 2018
Type 2 Dendritic Cells Orchestrate a Local Immune Circuit to Confer Antimetastatic Immunity
Orr-El Weizman1, Sophia Luyten1, Irina Krykbaeva2,3
1Department of Immunobiology, Yale University School of Medicine, New Haven, CT.
Abstract:
The progression of transformed primary tumors to metastatic colonization is a lethal determinant of disease outcome. Although circulating adaptive and innate lymphocyte effector responses are required for effective antimetastatic immunity, whether tissue-resident immune circuits confer initial immunity at sites of metastatic dissemination remains ill defined. Here we examine the nature of local immune cell responses during early metastatic seeding in the lung using intracardiac injection to mimic monodispersed metastatic spread. Using syngeneic murine melanoma and colon cancer models, we demonstrate that lung-resident conventional type 2 dendritic cells (DC2) orchestrate a local immune circuit to confer host antimetastatic immunity. Tissue-specific ablation of lung DC2, and not peripheral DC populations, led to increased metastatic burden in the presence of an intact T cell and NK cell compartment. We demonstrate that DC nucleic acid sensing and transcription factors IRF3 and IRF7 signaling are required for early metastatic control and that DC2 serve as a robust source of proinflammatory cytokines in the lung. Critically, DC2 direct the local production of IFN-γ by lung-resident NK cells, which limits the initial metastatic burden. Collectively, our results highlight, to our knowledge, a novel DC2-NK cell axis that colocalizes around pioneering metastatic cells to orchestrate an early innate immune response program to limit initial metastatic burden in the lung.
Insights
Lung-resident conventional type 2 dendritic cells (DC2) initiate an innate immune defense against early lung metastasis. This DC2-NK cell axis limits the spread of cancer cells, offering a new target for antimetastatic therapies.
Area of Science:
- Immunology
- Cancer Biology
- Metastasis Research
Background:
- Metastatic colonization is a primary cause of cancer mortality.
- The role of tissue-resident immune cells in early metastatic control is not well understood.
- Circulating immune responses are known to be important, but local immunity at metastatic sites requires further investigation.
Purpose of the Study:
- To investigate the role of local immune cell responses in early lung metastatic seeding.
- To identify specific immune cells and pathways involved in controlling initial metastatic burden.
- To elucidate the mechanisms by which tissue-resident immunity confers antimetastatic protection.
Main Methods:
- Utilized intracardiac injection in syngeneic murine melanoma and colon cancer models to mimic metastatic spread.
- Employed tissue-specific ablation of lung conventional type 2 dendritic cells (DC2).
- Analyzed the involvement of DC nucleic acid sensing, IRF3/IRF7 signaling, and NK cell activation.
Main Results:
- Lung-resident DC2, but not peripheral DC populations, are crucial for limiting metastatic burden.
- Ablation of lung DC2 led to increased metastasis, even with intact T and NK cell compartments.
- DC2 nucleic acid sensing and IRF3/IRF7 signaling are essential for early metastatic control.
- DC2 promote local NK cell production of IFN-γ, which restricts initial metastatic growth.
Conclusions:
- A novel DC2-NK cell axis in the lung orchestrates an early innate immune response against metastatic cells.
- This axis limits the initial burden of lung metastasis by directing NK cell-mediated IFN-γ production.
- Targeting this DC2-NK cell interaction may offer a new strategy for preventing or treating metastatic disease.
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