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1.
Nature ; 619(7969): 348-356, 2023 Jul.
Artigo em Inglês | MEDLINE | ID: mdl-37344597

RESUMO

The role of B cells in anti-tumour immunity is still debated and, accordingly, immunotherapies have focused on targeting T and natural killer cells to inhibit tumour growth1,2. Here, using high-throughput flow cytometry as well as bulk and single-cell RNA-sequencing and B-cell-receptor-sequencing analysis of B cells temporally during B16F10 melanoma growth, we identified a subset of B cells that expands specifically in the draining lymph node over time in tumour-bearing mice. The expanding B cell subset expresses the cell surface molecule T cell immunoglobulin and mucin domain 1 (TIM-1, encoded by Havcr1) and a unique transcriptional signature, including multiple co-inhibitory molecules such as PD-1, TIM-3, TIGIT and LAG-3. Although conditional deletion of these co-inhibitory molecules on B cells had little or no effect on tumour burden, selective deletion of Havcr1 in B cells both substantially inhibited tumour growth and enhanced effector T cell responses. Loss of TIM-1 enhanced the type 1 interferon response in B cells, which augmented B cell activation and increased antigen presentation and co-stimulation, resulting in increased expansion of tumour-specific effector T cells. Our results demonstrate that manipulation of TIM-1-expressing B cells enables engagement of the second arm of adaptive immunity to promote anti-tumour immunity and inhibit tumour growth.


Assuntos
Linfócitos B , Melanoma , Animais , Camundongos , Linfócitos B/citologia , Linfócitos B/imunologia , Linfócitos B/metabolismo , Ativação Linfocitária , Melanoma/imunologia , Melanoma/patologia , Melanoma/prevenção & controle , Linfócitos T/citologia , Linfócitos T/imunologia , Citometria de Fluxo , Melanoma Experimental/imunologia , Melanoma Experimental/patologia , Linfonodos/citologia , Linfonodos/imunologia , Apresentação de Antígeno , Receptores de Antígenos de Linfócitos B/genética , Análise da Expressão Gênica de Célula Única , Carga Tumoral , Interferon Tipo I
2.
Cell ; 184(26): 6281-6298.e23, 2021 12 22.
Artigo em Inglês | MEDLINE | ID: mdl-34875227

RESUMO

While intestinal Th17 cells are critical for maintaining tissue homeostasis, recent studies have implicated their roles in the development of extra-intestinal autoimmune diseases including multiple sclerosis. However, the mechanisms by which tissue Th17 cells mediate these dichotomous functions remain unknown. Here, we characterized the heterogeneity, plasticity, and migratory phenotypes of tissue Th17 cells in vivo by combined fate mapping with profiling of the transcriptomes and TCR clonotypes of over 84,000 Th17 cells at homeostasis and during CNS autoimmune inflammation. Inter- and intra-organ single-cell analyses revealed a homeostatic, stem-like TCF1+ IL-17+ SLAMF6+ population that traffics to the intestine where it is maintained by the microbiota, providing a ready reservoir for the IL-23-driven generation of encephalitogenic GM-CSF+ IFN-γ+ CXCR6+ T cells. Our study defines a direct in vivo relationship between IL-17+ non-pathogenic and GM-CSF+ and IFN-γ+ pathogenic Th17 populations and provides a mechanism by which homeostatic intestinal Th17 cells direct extra-intestinal autoimmune disease.


Assuntos
Autoimunidade , Intestinos/imunologia , Células-Tronco/metabolismo , Células Th17/imunologia , Animais , Movimento Celular , Células Clonais , Encefalomielite Autoimune Experimental/imunologia , Fator Estimulador de Colônias de Granulócitos e Macrófagos/metabolismo , Homeostase , Humanos , Interferon gama/metabolismo , Interleucina-17/metabolismo , Camundongos Endogâmicos C57BL , Especificidade de Órgãos , RNA/metabolismo , RNA-Seq , Receptores de Antígenos de Linfócitos T/metabolismo , Receptores CXCR6/metabolismo , Receptores de Interleucina/metabolismo , Reprodutibilidade dos Testes , Família de Moléculas de Sinalização da Ativação Linfocitária/metabolismo , Análise de Célula Única , Baço/metabolismo
4.
Nat Commun ; 10(1): 1424, 2019 03 29.
Artigo em Inglês | MEDLINE | ID: mdl-30926808

RESUMO

The drivers and the specification of CD4+ T cell differentiation in the tumor microenvironment and their contributions to tumor immunity or tolerance are incompletely understood. Using models of pancreatic ductal adenocarcinoma (PDA), we show that a distinct subset of tumor-infiltrating dendritic cells (DC) promotes PDA growth by directing a unique TH-program. Specifically, CD11b+CD103- DC predominate in PDA, express high IL-23 and TGF-ß, and induce FoxP3neg tumor-promoting IL-10+IL-17+IFNγ+ regulatory CD4+ T cells. The balance between this distinctive TH program and canonical FoxP3+ TREGS is unaffected by pattern recognition receptor ligation and is modulated by DC expression of retinoic acid. This TH-signature is mimicked in human PDA where it is associated with immune-tolerance and diminished patient survival. Our data suggest that CD11b+CD103- DC promote CD4+ T cell tolerance in PDA which may underscore its resistance to immunotherapy.


Assuntos
Células Dendríticas/imunologia , Interleucina-10/metabolismo , Interleucina-17/metabolismo , Neoplasias Pancreáticas/imunologia , Linfócitos T Reguladores/imunologia , Adenocarcinoma/genética , Adenocarcinoma/imunologia , Adenocarcinoma/patologia , Animais , Carcinoma Ductal Pancreático/genética , Carcinoma Ductal Pancreático/imunologia , Carcinoma Ductal Pancreático/patologia , Diferenciação Celular , Progressão da Doença , Fatores de Transcrição Forkhead , Regulação Neoplásica da Expressão Gênica , Humanos , Lectinas Tipo C/metabolismo , Camundongos Endogâmicos C57BL , Neoplasias Pancreáticas/genética , Neoplasias Pancreáticas/patologia , Fenótipo , Transdução de Sinais , Células Th17/imunologia , Receptor 2 Toll-Like/metabolismo , Tretinoína/metabolismo , Neoplasias Pancreáticas
5.
Nat Med ; 23(5): 556-567, 2017 May.
Artigo em Inglês | MEDLINE | ID: mdl-28394331

RESUMO

The progression of pancreatic oncogenesis requires immune-suppressive inflammation in cooperation with oncogenic mutations. However, the drivers of intratumoral immune tolerance are uncertain. Dectin 1 is an innate immune receptor crucial for anti-fungal immunity, but its role in sterile inflammation and oncogenesis has not been well defined. Furthermore, non-pathogen-derived ligands for dectin 1 have not been characterized. We found that dectin 1 is highly expressed on macrophages in pancreatic ductal adenocarcinoma (PDA). Dectin 1 ligation accelerated the progression of PDA in mice, whereas deletion of Clec7a-the gene encoding dectin 1-or blockade of dectin 1 downstream signaling was protective. We found that dectin 1 can ligate the lectin galectin 9 in mouse and human PDA, which results in tolerogenic macrophage programming and adaptive immune suppression. Upon disruption of the dectin 1-galectin 9 axis, CD4+ and CD8+ T cells, which are dispensable for PDA progression in hosts with an intact signaling axis, become reprogrammed into indispensable mediators of anti-tumor immunity. These data suggest that targeting dectin 1 signaling is an attractive strategy for developing an immunotherapy for PDA.


Assuntos
Carcinoma Ductal Pancreático/genética , Galectinas/metabolismo , Lectinas Tipo C/genética , Neoplasias Pancreáticas/genética , Evasão Tumoral/genética , Animais , Western Blotting , Carcinogênese/genética , Carcinoma Ductal Pancreático/imunologia , Carcinoma Ductal Pancreático/metabolismo , Células Epiteliais/metabolismo , Citometria de Fluxo , Técnicas de Silenciamento de Genes , Humanos , Tolerância Imunológica/genética , Imuno-Histoquímica , Imunoprecipitação , Lectinas Tipo C/imunologia , Lectinas Tipo C/metabolismo , Espectrometria de Massas , Camundongos , Camundongos Knockout , Ductos Pancreáticos/citologia , Neoplasias Pancreáticas/imunologia , Neoplasias Pancreáticas/metabolismo , Quinase Syk/genética , Quinase Syk/metabolismo , Evasão Tumoral/imunologia
6.
J Clin Invest ; 122(11): 4118-29, 2012 Nov.
Artigo em Inglês | MEDLINE | ID: mdl-23023703

RESUMO

Pancreatic ductal adenocarcinoma is an aggressive cancer that interacts with stromal cells to produce a highly inflammatory tumor microenvironment that promotes tumor growth and invasiveness. The precise interplay between tumor and stroma remains poorly understood. TLRs mediate interactions between environmental stimuli and innate immunity and trigger proinflammatory signaling cascades. Our finding that TLR7 expression is upregulated in both epithelial and stromal compartments in human and murine pancreatic cancer led us to postulate that carcinogenesis is dependent on TLR7 signaling. In a mouse model of pancreatic cancer, TLR7 ligation vigorously accelerated tumor progression and induced loss of expression of PTEN, p16, and cyclin D1 and upregulation of p21, p27, p53, c-Myc, SHPTP1, TGF-ß, PPARγ, and cyclin B1. Furthermore, TLR7 ligation induced STAT3 activation and interfaced with Notch as well as canonical NF-κB and MAP kinase pathways, but downregulated expression of Notch target genes. Moreover, blockade of TLR7 protected against carcinogenesis. Since pancreatic tumorigenesis requires stromal expansion, we proposed that TLR7 ligation modulates pancreatic cancer by driving stromal inflammation. Accordingly, we found that mice lacking TLR7 exclusively within their inflammatory cells were protected from neoplasia. These data suggest that targeting TLR7 holds promise for treatment of human pancreatic cancer.


Assuntos
Carcinoma Ductal Pancreático/metabolismo , Transformação Celular Neoplásica/metabolismo , Glicoproteínas de Membrana/metabolismo , Proteínas de Neoplasias/metabolismo , Neoplasias Pancreáticas/metabolismo , Receptor 7 Toll-Like/metabolismo , Animais , Carcinoma Ductal Pancreático/genética , Carcinoma Ductal Pancreático/imunologia , Carcinoma Ductal Pancreático/patologia , Transformação Celular Neoplásica/genética , Transformação Celular Neoplásica/imunologia , Transformação Celular Neoplásica/patologia , Regulação Neoplásica da Expressão Gênica/genética , Regulação Neoplásica da Expressão Gênica/imunologia , Humanos , Imunidade Inata/genética , Inflamação/genética , Inflamação/imunologia , Inflamação/metabolismo , Inflamação/patologia , Sistema de Sinalização das MAP Quinases/genética , Sistema de Sinalização das MAP Quinases/imunologia , Glicoproteínas de Membrana/genética , Glicoproteínas de Membrana/imunologia , Camundongos , Camundongos Mutantes , Proteínas de Neoplasias/genética , Proteínas de Neoplasias/imunologia , Neoplasias Pancreáticas/genética , Neoplasias Pancreáticas/imunologia , Neoplasias Pancreáticas/patologia , Receptor 7 Toll-Like/genética , Receptor 7 Toll-Like/imunologia
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