Abstract
Chronic inflammation drives the progression of colorectal cancer (CRC). Increased expression of interleukin (IL)-17A is associated with poor prognosis, and IL-17A blockade curbs tumor progression in preclinical models of CRC. Here we examined the impact of IL-1 signaling, a key regulator of the IL-17 pathway, in different cell types within the CRC microenvironment. Genetic deletion of the IL-1 receptor (IL-1R1) in epithelial cells alleviated tumorigenesis in the APC model of CRC, demonstrating a cell-autonomous role for IL-1 signaling in early tumor seed outgrowth. T cell specific ablation of IL-1R1 decreased tumor-elicited inflammation dependent on IL-17 and IL-22, thereby reducing CRC progression. The pro-tumorigenic roles of IL-1 were counteracted by its effects on myeloid cells, particularly neutrophils, where IL-1R1 ablation resulted in bacterial invasion into tumors, heightened inflammation and aggressive CRC progression. Thus, IL-1 signaling elicits cell-type-specific responses, which, in aggregate, set the inflammatory tone of the tumor microenvironment and determine the propensity for disease progression.
Original language | American English |
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Pages (from-to) | 166-180 e7 |
Journal | Immunity |
Volume | 50 |
Issue number | 1 |
DOIs | |
State | Published - 2019 |
Externally published | Yes |
Keywords
- Animals Carcinogenesis Cells, Cultured Colorectal Neoplasms/*immunology Humans Inflammation/*metabolism Interleukin-1/genetics/immunology/*metabolism Interleukin-17/*metabolism Interleukins/metabolism Mice Mice, Knockout Neutrophils/*immunology/ultrastructure Organ Specificity Receptors, Interleukin-1/genetics Salmonella/*immunology Salmonella Infections, Animal/*immunology Signal Transduction Tumor Microenvironment Interleukin-22 Cytokine Interleukin 1 cell type specific signaling colorectal cancer microbiota tumor elicited inflammation
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