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Zhu Y, Yang G. Identification of an IRF8 gene in common carp (Cyprinus carpio. L) and its regulatory role in immune responses. BMC Vet Res 2025; 21:143. [PMID: 40038681 PMCID: PMC11881467 DOI: 10.1186/s12917-025-04607-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/01/2023] [Accepted: 02/19/2025] [Indexed: 03/06/2025] Open
Abstract
BACKGROUND Interferon (IFN) regulatory factors (IRF) are the crucial transcription factors for IFN expression and leading host cells response to viral infection. IRF8 in mammals plays vital roles in the innate and adaptive immune systems. In this study, we identified and characterized the common carp (Cyprinus carpio. L) IRF8 gene (ccIRF8) to further clarify the function of IRF8 in teleost fish. RESULTS The complete cDNA sequence of ccIRF8 was 1431 bp and encodes a polypeptide of 431 amino acids. Analysis of the putative amino acid sequence showed that ccIRF8 encodes structures typical of the IRF family, including a DNA-binding domain (DBD), an IRF-association domain (IAD) and two nuclear localization signals (NLS). Comparison with homologous proteins showed that the deduced protein has the highest sequence identity to grass carp IRF8 (92.7%). Phylogenetic analysis grouped ccIRF8 with other IRF8s of teleosts. Quantitative RT-PCR analysis showed that ccIRF8 transcripts were detectable in all investigated tissues of healthy fish with the highest level in spleen. Following poly I: C and Aeromonas hydrophila challenge, ccIRF8 transcripts were induced significantly in immune relevant tissues. In addition, ccIRF8 was induced by poly I: C and ipopolysaccharide (LPS), peptidoglycan (PGN) and flagellin in HKLs. Overexpression of ccIRF8 increased the expression of IFN and IFN-stimulated genes (ISGs), and a dual-luciferase reporter assay revealed that ccIRF8 decreased the activation of NF-κB though TRAF6. CONCLUSIONS Overall, our findings provide a new perspective on the role of IRF8 in innate immunity in fish, as well as insights that will help the prevention and control of disease in the common carp farming industry.
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Affiliation(s)
- Yaoyao Zhu
- Key Laboratory of Tropical Marine Fishery Resources Protection and Utilization of Hainan Province, College of Fisheries and Life Science, Hainan Tropical Ocean University, No. 1 Yucai Road, Sanya, 572022, China.
- Hainan Key Laboratory for Conservation and Utilization of Tropical Marine Fishery Resources, Hainan Tropical Ocean University, Sanya, 572022, China.
- Yazhou Bay Innovation Institute, Hainan Tropical Ocean University, Sanya, China.
| | - Guiwen Yang
- Shandong Provincial Key Laboratory of Animal Resistance Biology, College of Life Sciences, Shandong Normal University, No. 88 East Wenhua Road, Jinan, 250014, China.
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Kim IK, Diamond MS, Yuan S, Kemp SB, Kahn BM, Li Q, Lin JH, Li J, Norgard RJ, Thomas SK, Merolle M, Katsuda T, Tobias JW, Baslan T, Politi K, Vonderheide RH, Stanger BZ. Plasticity-induced repression of Irf6 underlies acquired resistance to cancer immunotherapy in pancreatic ductal adenocarcinoma. Nat Commun 2024; 15:1532. [PMID: 38378697 PMCID: PMC10879147 DOI: 10.1038/s41467-024-46048-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/26/2023] [Accepted: 02/12/2024] [Indexed: 02/22/2024] Open
Abstract
Acquired resistance to immunotherapy remains a critical yet incompletely understood biological mechanism. Here, using a mouse model of pancreatic ductal adenocarcinoma (PDAC) to study tumor relapse following immunotherapy-induced responses, we find that resistance is reproducibly associated with an epithelial-to-mesenchymal transition (EMT), with EMT-transcription factors ZEB1 and SNAIL functioning as master genetic and epigenetic regulators of this effect. Acquired resistance in this model is not due to immunosuppression in the tumor immune microenvironment, disruptions in the antigen presentation machinery, or altered expression of immune checkpoints. Rather, resistance is due to a tumor cell-intrinsic defect in T-cell killing. Molecularly, EMT leads to the epigenetic and transcriptional silencing of interferon regulatory factor 6 (Irf6), rendering tumor cells less sensitive to the pro-apoptotic effects of TNF-α. These findings indicate that acquired resistance to immunotherapy may be mediated by programs distinct from those governing primary resistance, including plasticity programs that render tumor cells impervious to T-cell killing.
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Affiliation(s)
- Il-Kyu Kim
- Department of Medicine, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA, USA
- Abramson Cancer Center and Abramson Family Cancer Research Institute, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA, USA
| | - Mark S Diamond
- Department of Medicine, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA, USA
- Abramson Cancer Center and Abramson Family Cancer Research Institute, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA, USA
| | - Salina Yuan
- Department of Medicine, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA, USA
- Abramson Cancer Center and Abramson Family Cancer Research Institute, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA, USA
| | - Samantha B Kemp
- Department of Medicine, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA, USA
- Abramson Cancer Center and Abramson Family Cancer Research Institute, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA, USA
| | - Benjamin M Kahn
- Department of Medicine, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA, USA
- Abramson Cancer Center and Abramson Family Cancer Research Institute, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA, USA
- Department of Cell and Developmental Biology, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA, USA
| | - Qinglan Li
- Department of Cancer Biology, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA, USA
- Epigenetics Institute, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA, USA
| | - Jeffrey H Lin
- Department of Medicine, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA, USA
- Abramson Cancer Center and Abramson Family Cancer Research Institute, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA, USA
| | - Jinyang Li
- Department of Medicine, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA, USA
- Abramson Cancer Center and Abramson Family Cancer Research Institute, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA, USA
| | - Robert J Norgard
- Department of Medicine, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA, USA
- Abramson Cancer Center and Abramson Family Cancer Research Institute, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA, USA
| | - Stacy K Thomas
- Department of Medicine, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA, USA
- Abramson Cancer Center and Abramson Family Cancer Research Institute, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA, USA
| | - Maria Merolle
- Department of Medicine, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA, USA
- Abramson Cancer Center and Abramson Family Cancer Research Institute, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA, USA
| | - Takeshi Katsuda
- Department of Medicine, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA, USA
- Abramson Cancer Center and Abramson Family Cancer Research Institute, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA, USA
| | - John W Tobias
- Penn Genomic Analysis Core, University of Pennsylvania, Philadelphia, PA, USA
| | - Timour Baslan
- Department of Biomedical Sciences, School of Veterinary Medicine, University of Pennsylvania, Philadelphia, PA, USA
| | - Katerina Politi
- Yale Cancer Center, Yale School of Medicine, New Haven, CT, USA
- Department of Pathology, Yale School of Medicine, New Haven, CT, USA
- Section of Medical Oncology, Department of Internal Medicine, Yale School of Medicine, New Haven, CT, USA
| | - Robert H Vonderheide
- Department of Medicine, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA, USA.
- Abramson Cancer Center and Abramson Family Cancer Research Institute, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA, USA.
- Parker Institute for Cancer Immunotherapy, University of Pennsylvania, Philadelphia, PA, USA.
| | - Ben Z Stanger
- Department of Medicine, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA, USA.
- Abramson Cancer Center and Abramson Family Cancer Research Institute, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA, USA.
- Department of Cell and Developmental Biology, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA, USA.
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Kim IK, Diamond M, Yuan S, Kemp S, Li Q, Lin J, Li J, Norgard R, Thomas S, Merolle M, Katsuda T, Tobias J, Politi K, Vonderheide R, Stanger B. Plasticity-induced repression of Irf6 underlies acquired resistance to cancer immunotherapy. RESEARCH SQUARE 2023:rs.3.rs-2960521. [PMID: 37398248 PMCID: PMC10312946 DOI: 10.21203/rs.3.rs-2960521/v1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 07/04/2023]
Abstract
Acquired resistance to immune checkpoint immunotherapy remains a critical yet incompletely understood biological mechanism. Here, using a mouse model of pancreatic ductal adenocarcinoma (PDAC) to study tumor relapse following immunotherapy-induced responses, we found that tumors underwent an epithelial-to-mesenchymal transition (EMT) that resulted in reduced sensitivity to T cell-mediated killing. EMT-transcription factors (EMT-TFs) ZEB1 and SNAIL function as master genetic and epigenetic regulators of this tumor-intrinsic effect. Acquired resistance was not due to immunosuppression in the tumor immune microenvironment, disruptions in the antigen presentation machinery, or altered expression of immune checkpoints. Rather, EMT was associated with epigenetic and transcriptional silencing of interferon regulatory factor 6 (Irf6), which renders tumor cells less sensitive to the pro-apoptotic effects of TNF-α. These findings show how resistance to immunotherapy in PDAC can be acquired through plasticity programs that render tumor cells impervious to T cell killing.
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