Abstract
Immune responses may arrest tumor growth by inducing tumor dormancy. The mechanisms leading to either tumor dormancy or promotion of multistage carcinogenesis by adaptive immunity are poorly characterized. Analyzing T antigen (Tag)-induced multistage carcinogenesis in pancreatic islets, we show that Tag-specific CD4+ T cells home selectively into the tumor microenvironment around the islets, where they either arrest or promote transition of dysplastic islets into islet carcinomas. Through combined TNFR1 signaling and IFN-gamma signaling, Tag-specific CD4+ T cells induce antiangiogenic chemokines and prevent alpha(v)beta(3) integrin expression, tumor angiogenesis, tumor cell proliferation, and multistage carcinogenesis, without destroying Tag-expressing islet cells. In the absence of either TNFR1 signaling or IFN-gamma signaling, the same T cells paradoxically promote angiogenesis and multistage carcinogenesis. Thus, tumor-specific T cells can directly survey multistage carcinogenesis through cytokine signaling.
Publication types
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Research Support, Non-U.S. Gov't
MeSH terms
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Animals
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Antigens, Viral, Tumor / genetics
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Antigens, Viral, Tumor / metabolism
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Blood Glucose / metabolism
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CD4-Positive T-Lymphocytes / immunology*
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CD4-Positive T-Lymphocytes / metabolism
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CD4-Positive T-Lymphocytes / pathology
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CD4-Positive T-Lymphocytes / transplantation
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Cell Movement
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Cell Proliferation*
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Cell Survival
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Cell Transformation, Neoplastic / genetics
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Cell Transformation, Neoplastic / immunology*
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Cell Transformation, Neoplastic / metabolism
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Cell Transformation, Neoplastic / pathology
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Cells, Cultured
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GTPase-Activating Proteins / genetics
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GTPase-Activating Proteins / metabolism
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Immunotherapy / methods
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Insulinoma / blood supply
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Insulinoma / genetics
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Insulinoma / immunology*
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Insulinoma / metabolism
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Insulinoma / pathology
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Insulinoma / therapy
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Integrin alphaVbeta3 / metabolism
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Interferon-gamma / metabolism*
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Mice
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Mice, Inbred C3H
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Mice, Knockout
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Mice, Transgenic
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Neovascularization, Pathologic / immunology
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Neovascularization, Pathologic / pathology
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Pancreatic Neoplasms / blood supply
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Pancreatic Neoplasms / genetics
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Pancreatic Neoplasms / immunology*
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Pancreatic Neoplasms / metabolism
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Pancreatic Neoplasms / pathology
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Pancreatic Neoplasms / therapy
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Receptors, Tumor Necrosis Factor, Type I / deficiency
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Receptors, Tumor Necrosis Factor, Type I / genetics
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Receptors, Tumor Necrosis Factor, Type I / metabolism*
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Signal Transduction*
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Th1 Cells / immunology
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Th1 Cells / pathology
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Time Factors
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Whole-Body Irradiation
Substances
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Antigens, Viral, Tumor
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Blood Glucose
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GTPase-Activating Proteins
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Integrin alphaVbeta3
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Ralbp1 protein, mouse
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Receptors, Tumor Necrosis Factor, Type I
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Tnfrsf1a protein, mouse
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Interferon-gamma