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Lung conventional dendritic cells promote mucosal adjuvant activity of flagellin

ABSTRACT: The activity of the potent nasal adjuvant flagellin depends on initial activation of airway epithelilal cells. This study aims at investigating the immune cells involved in the antigen presentation within the respiratory tract. First, microarrays characterized that activation/recruitment of immune cells was the main signature of flagellin activation in lung. Neutrophils and classical monocytes were strongly recruited into the lungs and take up antigen upon nasal administration of flagellin. In contrast, the numbers of lung CD11b+ or CD103+ DC and alveolar macrophages were not enhanced although these cells were very efficient in antigen uptake. Our experiments showed that CD11b+ DC but not monocytes, PMN, CD103+ DC are not essential for the adjuvant effect. Flagellin signaling enhanced the functional activation of lung CD11b+ conventional DC and their migration to the lymph nodes. Using Cd11c-DTR mice, CD11b+ DC from lymph nodes were identified as the major stimulators of CD4 T cell activation. Finally, the migration and maturation of mucosal DC was independent of direct signaling, highlighting the contribution of epithelial factors in the mucosal adjuvant effect of flagellin. In conclusion, these data demonstrate that adjuvant activity can be dissociated from inflammatory cell recruitment an open new perpectives for improvement of vaccines.

ORGANISM(S): Mus musculus

PROVIDER: GSE46421 | GEO | 2014/01/01

SECONDARY ACCESSION(S): PRJNA200309

REPOSITORIES: GEO

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Lung conventional dendritic cells promote mucosal adjuvant activity of flagellin

Project description:The activity of the potent nasal adjuvant flagellin depends on initial activation of airway epithelilal cells. This study aims at investigating the immune cells involved in the antigen presentation within the respiratory tract. First, microarrays characterized that activation/recruitment of immune cells was the main signature of flagellin activation in lung. Neutrophils and classical monocytes were strongly recruited into the lungs and take up antigen upon nasal administration of flagellin. In contrast, the numbers of lung CD11b+ or CD103+ DC and alveolar macrophages were not enhanced although these cells were very efficient in antigen uptake. Our experiments showed that CD11b+ DC but not monocytes, PMN, CD103+ DC are not essential for the adjuvant effect. Flagellin signaling enhanced the functional activation of lung CD11b+ conventional DC and their migration to the lymph nodes. Using Cd11c-DTR mice, CD11b+ DC from lymph nodes were identified as the major stimulators of CD4 T cell activation. Finally, the migration and maturation of mucosal DC was independent of direct signaling, highlighting the contribution of epithelial factors in the mucosal adjuvant effect of flagellin. In conclusion, these data demonstrate that adjuvant activity can be dissociated from inflammatory cell recruitment an open new perpectives for improvement of vaccines. Female C57BL/6J (6 weeks old) mice were immunized with the TLR5 agonist Flagellin (1Î¼g diluted in PBS) by intranasal (i.n.) administration. Blood samples of four time points post immunization were taken at 2h, 4h, 18h and 48h. Microarray experiments were performed as single-color hybridizations.

2014-01-01 | E-GEOD-46421 | biostudies-arrayexpress

Mouse lung CD103+ and CD11b-high dendritic cell (DC) subsets

2010-03-15 | GSE17322 | GEO

Mouse lung CD103+ and CD11b-high dendritic cell (DC) subsets

Project description:Mouse lung CD11c+ dendritic cells are composed of 2 major DC subsets, the CD103+CD11b-low/intermediate DC (CD103+ DC) and the CD11b-highCD103- DC (CD11b-high DC). These 2 subsets are functionally distinct. Comparison of their functions showed CD103+ DC Microarray analysis was performed to compare the gene expression profiles of the 2 lung DC subsets in naÃ¯ve mice. Perfused lungs from 6-8-week naÃ¯ve BALB/cByJ mice were pooled and digested with collagenase D. CD11c+ cells were selected by anti-CD11c magnetic microbeads (Miltenyi) and stained by fluorochrome-conjugated mAb against I-A, CD103, CD11b, and CD11c plus 7-

2010-03-24 | E-GEOD-17322 | biostudies-arrayexpress

Mouse lung transcriptional response to flagellin stimulation

Project description:Vaccine adjuvants enhance adaptive immunity to co-administered antigens. Whereas the modes of action are multiple, the activation of antigen-presenting cells (APC) like dendritic cells by adjuvants is a prerequisite. Detection of microbial signals by innate sensors like Toll-like receptors (TLR) is a major mechanism of APC activation. Most candidate or licensed vaccines assume that adjuvant activity of TLR agonists depends on direct effect on APCs. This study addressed whether TLR stimulation of non-hematopoietic cells could contribute to the adjuvant effect. Nasal administration of flagellin enhanced T cell- and antibody-mediated immunity to co-administered antigens in a TLR5-dependent but inflammasome-independent manner. We found that lung radioresistant cells were sufficient to promote immunity, thereby suggesting that direct TLR5-mediated APC stimulation is dispensable to adjuvant activity. Consistent with this, radioresistant compartment is essential to stimulate the swift TLR5-dependent transcription. The transcriptional response was restricted to the epithelial compartment and was associated to the production of a narrow set of mediators including the chemokine CCL20, known to promote APC recruitment in mucosal tissues. Besides, flagellin was rapidly degraded in lower airways and was not transported into lung parenchyma or peripheral tissues. This study therefore suggests an unexpected mechanism for how TLR agonists act as adjuvant and how epithelium is instrumental to sense and integrate microbial signals to promote adaptive immunity. In conclusion, the immune-enhancing effect of adjuvants on epithelial cells can be harnessed for improving vaccines. 1 µg of flagellin was instillated intranasally to LPS-unresponsive C3H/HeJ mice. Total lung RNA was extracted 1h later and prepare for hybridization on Affymetrix microarrays.

2013-03-22 | E-GEOD-45369 | biostudies-arrayexpress

Transcriptional profiling of small intestinal lamina propria Dendritic cells by microarray

Project description:CD103+CD11b+ dendritic cells (DC) are unique to the intestine, but the factors governing their differentiation are unclear. Here we show that transforming growth factor receptor 1 (TGF beta 1) has an indispensable, cell intrinsic role in the development of these cells. Deletion of Tgfbr1 results in markedly fewer intestinal CD103+CD11b+ DCs and a reciprocal increase in the CD103–CD11b+ DC subset. Transcriptional profiling identifies markers that define the CD103+CD11b+ DC lineage, including CD101, TREM1 and Siglec-F, and shows that the absence of CD103+CD11b+ DCs in CD11c-Cre.Tgfbr1fl/fl mice reflects defective differentiation from CD103–CD11b+ intermediaries, rather than an isolated loss of CD103 expression. The defect in CD103+CD11b+ DCs is accompanied by reduced generation of antigen-specific, inducible FoxP3+ regulatory T (Treg) cells in vitro and in vivo, and by reduced numbers of endogenous TH17 cells in the intestinal mucosa. Thus, TGF beta 1 mediated signalling may explain the tissue-specific development of these unique DCs.

2017-06-23 | GSE100393 | GEO

Distinct murine mucosal Langerhans cell subsets develop from pre-DCs and monocytes

Project description:Langerhans cells (LCs) populate the mucosal epithelium, a major entry portal for pathogens, yet their ontogeny remains unclear. In contrast to skin LCs originating from self-renewing radioresistant embryonic precursors, we found that oral mucosal LCs derive from circulating radiosensitive precursors. Mucosal LCs can be segregated into CD103+CD11blow (CD103+LCs) and CD11b+CD103- (CD11b+LCs) subsets. We further demonstrated that similar to non-lymphoid dendritic cells (DCs), CD103+LCs originate from pre-DCs, whereas CD11b+LCs differentiate from both pre-DCs and monocytic precursors. Despite this ontogenetic discrepancy between skin and mucosal LCs, transcriptomic signature and immunological function of oral LCs highly resemble those of skin LCs but not DCs. These findings, along with their epithelial position, morphology and expression of LC-associated phenotype strongly suggest that oral mucosal LCs are genuine LCs. Collectively, in a tissue-dependent manner, murine LCs differentiate from at least three distinct precursors (embryonic, pre-DCs and monocytic) in steady state The following cells were isolated from mice (2-4 replicates): Lung DCs, mucosal CD103+ LC, mucosal CD11b+ LC, Skin LC. Transcriptome analysis was performed.

2015-08-31 | E-GEOD-68789 | biostudies-arrayexpress

Mouse lung transcriptional response to flagellin stimulation

2013-03-22 | GSE45369 | GEO

Migratory CD11b+ conventional dendritic cells induce T follicular helper cell dependent antibody responses

Project description:T follicular helper (Tfh) cells are a subset of CD4+ T cells that promote antibody production during vaccination. Conventional dendritic cells (cDCs) efficiently prime Tfh cells; however, conclusions regarding the nature of the cDC responsible for instructing Tfh cell differentiation have differed between recent studies. We found that these discrepancies might exist, in part, due to the unusual sites used for immunization in murine models, which differentially bias which DC subsets access antigen. We used intranasal immunization as a physiologically relevant route of exposure that we show delivers antigen to all tissue DC subsets. Using a combination of mice in which the function of individual DC subsets is impaired and different formulations of antigen delivery, we determined that CD11b+ migratory type 2 conventional DCs (cDC2s) are necessary and sufficient for Tfh induction. DC-specific deletion of the guanine nucleotide exchange factor DOCK8 resulted in an isolated loss of CD11b+ cDC2 but not CD103+ cDC1 migration to lung-draining lymph nodes. Impaired cDC2 migration or development in DC-specific Dock8 or Irf4 knockout mice, respectively, led to reduced Tfh cell and antibody development, whereas loss of CD103+ cDC1s in Batf3-/- mice did not. Loss of cDC2-mediated Tfh responses was associated with impaired antibody-mediated protection from live influenza virus challenge. We show that migratory cDC2s uniquely carry antigen into the sub-anatomic regions of the lymph node where Tfh cell priming occurs, the T-B border. This work identifies the DC responsible for Tfh cell-dependent antibody responses, in particular when antigen dose is limiting or is encountered at a mucosal site, which could ultimately inform the formulation and delivery of vaccines.

2017-12-01 | GSE103956 | GEO

RNA-seq of lung myeloid cells from WT and Ptgs2-cKO mice

Project description:To investigate the role of the COX-2-dependent lung fibroblast program in reprogramming lung myeloid cells, we generated fibroblast-targeted Ptgs2 conditional knockout mice by crossing Pdgfra-Cre mice with Ptgs2flox/flox mice. Then we isolated two primary types of lung resident DCs-CD103+ conventional DC (cDC1) and CD11b+ conventional DC (cDC2), and lung monocytes from WT and Ptgs2 cKO mice by fluorescence-activated cell sorting and performed RNA sequencing.

2022-07-19 | E-MTAB-11888 | biostudies-arrayexpress

Retinoic acid directs the development and transcriptional programming of intestinal dendritic cells

Project description:This file contains gene microarray data from bone marrow pre-ul DC, in vitro derived CD103+CD11b+ and CD103+CD11b- cDC with or without retinoic acid.

2015-08-01 | GSE68399 | GEO

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