Unknown,Transcriptomics,Genomics,Proteomics

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Differences in the transcriptomic response of human adult and neonatal dendritic cell subsets to TLR7/8 stimulation

ABSTRACT: Previous studies have shown that purified dendritic cells (DCs) have cell-intrinsic, age-dependent differences in their response to TLR stimulation. To delineate which aspects of the age-dependent difference in innate immunity are cell intrinsic vs extrinsic, we searched for global differences to TLR7/8 stimulation in purified adult vs neonatal DC populations. We hypothesize that very few selected cell intrinsic differences in gene expression of key immune genes between these 2 age groups exist, and the bulk would be cell extrinsic differences. The results show that there are age-dependent differences in expression of several key genes involved in the immune response at baseline already. Upon stimulation, we identified a substantially larger fraction of age-dependent differentially expressed genes in conventional than plasmacytoid DCs. Bioinformatics analyses indicate that important immune pathways were significantly differentially expressed in DC subsets between the 2 age groups. Total RNA was isolated from purified human conventional and plasmacytoid dendritic cells from 6 adult and 6 cord blood donors that were stimulated with 3M-003 at a final concentration of 5 uM for 1 and 6 hr.

ORGANISM(S): Homo sapiens

SUBMITTER: Kathleen Wee

PROVIDER: E-GEOD-67057 | biostudies-arrayexpress |

REPOSITORIES: biostudies-arrayexpress

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Project description:Dendritic cells (DCs) are a complex group of cells which play a critical role in vertebrate immunity. Spleen or lymph node resident DCs are subdivided into conventional DC (cDC) subsets (CD11b and CD8alpha in mouse; BDCA1 and BDCA3 in man) and plasmacytoid DCs (pDCs). It is currently unclear if these various DC populations belong to a unique hematopoietic lineage and if the subsets identified in the mouse and human systems are evolutionary homologs. To bring novel insights into these questions, we sought conserved genetic signatures for these DCs through the analysis of a compendium of genome-wide expression profiles of mouse or human leukocytes. We show through clustering analysis that all spleen resident DC subsets form a distinct branch within the leukocyte family tree, and reveal a transcriptomal signature evolutionary conserved in all these DC subsets. Moreover we identify a large gene expression program shared between mouse and human plasmacytoid DCs, and smaller conserved profiles shared between mouse and human cDC subsets. Finally, we use compendium analysis to re-evaluate the classification of interferon-producing killer DCs (IKDCs) and lin-CD16+HLA-DR+ cells, which have both been claimed to be DCs, and show that these cells are more closely linked to NK or myeloid cells, respectively. Our study thus provides a unique resource for future investigation of the evolutionarily conserved molecular pathways governing the ontogeny and functions of leukocyte subsets, especially DCs. Experiment Overall Design: This study includes data from cell sort purified dendritic cells, B cells, NK cells, and CD8 T cells. 2 or 3 independent replicates were made for each cell type. The genearray was performed in an attempt to investigate the relationships between DCs subsets and with other leukocytes, in mouse, in human, and between these 2 species. To this end, public data for mouse CD4 T cells and macrophages, as well as public data for human leukocyte subsets were also used in the analysis. The results have led to the identification of specific transcriptional programs conserved between human and mouse dendritic cell subsets.

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Differences in the transcriptomic response of human adult and neonatal dendritic cell subsets to TLR7/8 stimulation

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