Project description:We hypothesize that under homeostatic as well as inflammatory conditions circulating monocytes and/or their bone marrow-derived progenitors might contribute to the replenishment of CD103+ and CD103- DC in lymphoid and non-lymphoid compartments. To that end, bone marrow cells from CX3CR1+/gfp C57BL/6 mice were sorted as follows: lineage negative (CD3, CD19, NK1.1, Ter119, Ly6G and CD11c) CX3CR1+c-kit+. Sorted cells were further cultured in vitro under the continuous presence of GM-CSF. lin-CX3CR1+c-kit+ bone marrow cells gave rise to CD103+ and CD103- DC in vitro. To test whether CD103 might be a suitable marker that allows the differentiation of functionally distinct DC subsets generated in vitro, CD11c+CD103+ and CD11c+CD103- DC were sorted from day 5 cultures of lin-CX3CR1+c-kit+ cells and analyzed by whole mouse genome microarrays from Agilent technologies. Compared to CD103+ DC, CD103- DC displayed a strong up-regulation of transcripts for genes involved in innate immunity, whereas those involved in costimulation were down-modulated. Our data suggest distinct functional activity of these two DC subsets. Keywords: Transcriptional profiling-Cell type comparison We compared the transcriptional profile of CD11c+CD103+ and CD11c+CD103- dendritic cells by use of Agilent Whole Mouse Genome Microarrays. Two sets of samples were generated independently as real biological replicates. The microarray analysis was performed as a dual-color experiment, including a dye-swap.
Project description:We hypothesize that under homeostatic as well as inflammatory conditions circulating monocytes and/or their bone marrow-derived progenitors might contribute to the replenishment of CD103+ and CD103- DC in lymphoid and non-lymphoid compartments. To that end, bone marrow cells from CX3CR1+/gfp C57BL/6 mice were sorted as follows: lineage negative (CD3, CD19, NK1.1, Ter119, Ly6G and CD11c) CX3CR1+c-kit+. Sorted cells were further cultured in vitro under the continuous presence of GM-CSF. lin-CX3CR1+c-kit+ bone marrow cells gave rise to CD103+ and CD103- DC in vitro. To test whether CD103 might be a suitable marker that allows the differentiation of functionally distinct DC subsets generated in vitro, CD11c+CD103+ and CD11c+CD103- DC were sorted from day 5 cultures of lin-CX3CR1+c-kit+ cells and analyzed by whole mouse genome microarrays from Agilent technologies. Compared to CD103+ DC, CD103- DC displayed a strong up-regulation of transcripts for genes involved in innate immunity, whereas those involved in costimulation were down-modulated. Our data suggest distinct functional activity of these two DC subsets. Keywords: Transcriptional profiling-Cell type comparison
Project description:We cultured bone marrow derived dendritic cells from WT and CD11c KO mice. Then, a group of bone marrow dendritic cells were stimulated with LPS overnight. We obtained bone marrow derived dendritic cells with or without LPS stimulation and analyzed proteomics profiles.
Project description:Dendritic cells (DCs) and macrophages (MPs) are important for immunological homeostasis in the colon. We found that F4/80hi CX3CR1hi (CD11b+CD103-) cells account for 80% of mouse colonic lamina propria (cLP) MHC-IIhi cells. Both CD11c+ and CD11c- cells within this population were identified as MPs based on multiple criteria, including a MP transcriptome revealed by microarray analysis. These MPs constitutively released high levels of IL-10 at least partially in response to the microbiota via an MyD88-independent mechanism. In contrast, cells expressing low to intermediate levels of F4/80 and CX3CR1 were identified as DCs, based on phenotypic and functional analysis and comprise three separate CD11chi cell populations: CD103+CX3CR1-CD11b- DCs, CD103+CX3CR1-CD11b+ DCs and CD103-CX3CR1intCD11b+ DCs. In non-inflammatory conditions, Ly6Chi monocytes differentiated primarily into CD11c+, but not CD11c- MPs. In contrast, during colitis, Ly6Chi monocytes massively invaded the colon and differentiated into pro-inflammatory CD103-CX3CR1intCD11b+ DCs, which produced high levels of IL-12, IL-23, iNOS and TNF. These findings demonstrate the dual capacity of Ly6Chi blood monocytes to differentiate into either regulatory MPs or inflammatory DCs in the colon, and that the balance of these immunologically antagonistic cell types is dictated by microenvironmental conditions. FACS sorted expression from normal controls
Project description:To investigate the role of IRF8 in the inflammatory microenvironment of abdominal aortic aneurysm tissue, bone marrow cells were isolated from the tibias and femurs of 8-week-old male mice and cultured with granulocyte-macrophage colony-stimulating factor and Flt3L cytokines to generate CD103-positive dendritic cells. Cells were harvested on days 9 and 15-16 and stimulated with tumor necrosis factor-alpha. Gene ontology analysis revealed upregulation of T cell activation and chemotaxis in bone marrow-derived dendritic cells from IRF8 overexpression mice, indicating IRF8's role in dendritic cell-T cell interactions. Protein-protein interaction analysis highlighted Cd40 and Fcgr1 as key surface markers. IRF8-related genes were enriched in type I interferon signaling pathways, implicating IRF8 in antigen presentation functions of dendritic cells.
Project description:Multiple subsets of FLT3L-dependent dendritic cells (DCs) control T cell tolerance and immunity. In mouse tissues, CD8α-like DCs are identified by CD103 expression. This DC subset efficiently enters lymph nodes and cross-presents antigens, rendering CD103+ DCs promising targets for therapeutic tolerance induction or vaccination. However, only limited numbers of CD103+ DCs can be isolated with current methods. Moreover, bone marrow cultures with FLT3L produce complex mixtures of DC subsets. We developed a novel method for generating large numbers of Batf3-dependent CD103+ DCs. We used microarray analysis to compare in vitro generated CD103+ and CD103- DCs and correlated their expression patterns to published profiles and signatures of DC subsets.
Project description:Dendritic cells (DCs) and macrophages (MPs) are important for immunological homeostasis in the colon. We found that F4/80hi CX3CR1hi (CD11b+CD103-) cells account for 80% of mouse colonic lamina propria (cLP) MHC-IIhi cells. Both CD11c+ and CD11c- cells within this population were identified as MPs based on multiple criteria, including a MP transcriptome revealed by microarray analysis. These MPs constitutively released high levels of IL-10 at least partially in response to the microbiota via an MyD88-independent mechanism. In contrast, cells expressing low to intermediate levels of F4/80 and CX3CR1 were identified as DCs, based on phenotypic and functional analysis and comprise three separate CD11chi cell populations: CD103+CX3CR1-CD11b- DCs, CD103+CX3CR1-CD11b+ DCs and CD103-CX3CR1intCD11b+ DCs. In non-inflammatory conditions, Ly6Chi monocytes differentiated primarily into CD11c+, but not CD11c- MPs. In contrast, during colitis, Ly6Chi monocytes massively invaded the colon and differentiated into pro-inflammatory CD103-CX3CR1intCD11b+ DCs, which produced high levels of IL-12, IL-23, iNOS and TNF. These findings demonstrate the dual capacity of Ly6Chi blood monocytes to differentiate into either regulatory MPs or inflammatory DCs in the colon, and that the balance of these immunologically antagonistic cell types is dictated by microenvironmental conditions.
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. We analyze transcript expression data from bone marrow pre-uDC, Splenic and SI cDC1 and cDC2 (GSE15907 - 18 samples), in vitro derived CD103+CD11b+ and CD103+CD11b- cDC from C57Bl/6 mice. The complete dataset is linked below as a supplementary file.