Abstract
Although psycho-social stress is a well-known factor that contributes to the development of cancer, it remains largely unclear whether and how environmental eustress influences malignant diseases and regulates cancer-related therapeutic responses. Using an established eustress model, we demonstrate that mice living in an enriched environment (EE) are protected from carcinogen-induced liver neoplasia and transplantable syngeneic liver tumors, owning to a CD8+ T cell-dependent tumor control. We identify a peripheral Neuro-Endocrine-Immune pathway in eustress, including Sympathetic nervous system (SNS)/β-adrenergic receptors (β-ARs)/CCL2 that relieves tumor immunosuppression and overcomes PD-L1 resistance to immunotherapy. Notably, EE activates peripheral SNS and β-ARs signaling in tumor cells and tumor infiltrated myeloid cells, leading to suppression of CCL2 expression and activation of anti-tumor immunity. Either blockade of CCL2/CCR2 or β-AR signaling in EE mice lose the tumor protection capability. Our study reveales that environmental eustress via EE stimulates anti-tumor immunity, resulting in more efficient tumor control and a better outcome of immunotherapy.
© 2021. The Author(s).
Publication types
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Research Support, Non-U.S. Gov't
MeSH terms
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Animals
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B7-H1 Antigen / antagonists & inhibitors
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Carbon Tetrachloride / administration & dosage
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Carbon Tetrachloride / toxicity
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Chemokine CCL2 / antagonists & inhibitors
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Chemokine CCL2 / metabolism
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Diethylnitrosamine / administration & dosage
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Diethylnitrosamine / toxicity
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Drug Resistance, Neoplasm / immunology*
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Hepatic Stellate Cells
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Hepatocytes
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Humans
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Immune Checkpoint Inhibitors / pharmacology*
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Immune Checkpoint Inhibitors / therapeutic use
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Liver / drug effects
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Liver / immunology
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Liver / pathology
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Liver Neoplasms, Experimental / chemically induced
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Liver Neoplasms, Experimental / drug therapy*
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Liver Neoplasms, Experimental / immunology
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Liver Neoplasms, Experimental / pathology
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Male
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Mice
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Neuroimmunomodulation*
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Organoids
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Receptors, Adrenergic, beta / metabolism
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Receptors, CCR2 / antagonists & inhibitors
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Receptors, CCR2 / metabolism
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Signal Transduction / drug effects
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Signal Transduction / immunology
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Stress, Psychological / immunology*
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Sympathetic Nervous System / immunology
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Tumor Escape
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Tumor Microenvironment / drug effects
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Tumor Microenvironment / immunology
Substances
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B7-H1 Antigen
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Ccl2 protein, mouse
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Ccr2 protein, mouse
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Cd274 protein, mouse
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Chemokine CCL2
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Immune Checkpoint Inhibitors
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Receptors, Adrenergic, beta
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Receptors, CCR2
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Diethylnitrosamine
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Carbon Tetrachloride