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Differential gene expression in thrombomodulin (TM; CD141)(+) and TM(-) dendritic cell subsets.

ABSTRACT: Previously we have shown in a mouse model of bronchial asthma that thrombomodulin can convert immunogenic conventional dendritic cells into tolerogenic dendritic cells while inducing its own expression on their cell surface. Thrombomodulin(+) dendritic cells are tolerogenic while thrombomodulin(-) dendritic cells are pro-inflammatory and immunogenic. Here we hypothesized that thrombomodulin treatment of dendritic cells would modulate inflammatory gene expression. Murine bone marrow-derived dendritic cells were treated with soluble thrombomodulin and expression of surface markers was determined. Treatment with thrombomodulin reduces the expression of maturation markers and increases the expression of TM on the DC surface. Thrombomodulin treated and control dendritic cells were sorted into thrombomodulin(+) and thrombomodulin(-) dendritic cells before their mRNA was analyzed by microarray. mRNAs encoding pro-inflammatory genes and dendritic cells maturation markers were reduced while expression of cell cycle genes were increased in thrombomodulin-treated and thrombomodulin(+) dendritic cells compared to control dendritic cells and thrombomodulin(-) dendritic cells. Thrombomodulin-treated and thrombomodulin(+) dendritic cells had higher expression of 15-lipoxygenase suggesting increased synthesis of lipoxins. Thrombomodulin(+) dendritic cells produced more lipoxins than thrombomodulin(-) dendritic cells, as measured by ELISA, confirming that this pathway was upregulated. There was more phosphorylation of several cell cycle kinases in thrombomodulin(+) dendritic cells while phosphorylation of kinases involved with pro-inflammatory cytokine signaling was reduced. Cultures of thrombomodulin(+) dendritic cells contained more cells actively dividing than those of thrombomodulin(-) dendritic cells. Production of IL-10 is increased in thrombomodulin(+) dendritic cells. Antagonism of IL-10 with a neutralizing antibody inhibited the effects of thrombomodulin treatment of dendritic cells suggesting a mechanistic role for IL-10. The surface of thrombomodulin(+) dendritic cells supported activation of protein C and procarboxypeptidase B2 in a thrombomodulin-dependent manner. Thus thrombomodulin treatment increases the number of thrombomodulin(+) dendritic cells, which have significantly altered gene expression compared to thrombomodulin(-) dendritic cells in key immune function pathways.

SUBMITTER: Toda M

PROVIDER: S-EPMC3751914 | biostudies-literature | 2013

REPOSITORIES: biostudies-literature

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Differential gene expression in thrombomodulin (TM; CD141)(+) and TM(-) dendritic cell subsets.

Toda Masaaki M Shao Zhifei Z Yamaguchi Ken D KD Takagi Takehiro T D'Alessandro-Gabazza Corina N CN Taguchi Osamu O Salamon Hugh H Leung Lawrence L K LL Gabazza Esteban C EC Morser John J

PloS one 20130823 8

Previously we have shown in a mouse model of bronchial asthma that thrombomodulin can convert immunogenic conventional dendritic cells into tolerogenic dendritic cells while inducing its own expression on their cell surface. Thrombomodulin(+) dendritic cells are tolerogenic while thrombomodulin(-) dendritic cells are pro-inflammatory and immunogenic. Here we hypothesized that thrombomodulin treatment of dendritic cells would modulate inflammatory gene expression. Murine bone marrow-derived dendr ...[more]

PMID: 24009678

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Project description:Human immune cell subsets develop in immunodeficient mice following reconstitution with human CD34+ hematopoietic stem cells. These "humanized" mice are useful models to study human immunology and human-tropic infections, autoimmunity, and cancer. However, some human immune cell subsets are unable to fully develop or acquire full functional capacity due to a lack of cross-reactivity of many growth factors and cytokines between species. Conventional dendritic cells (cDCs) in mice are categorized into cDC1, which mediate T helper (Th)1 and CD8+ T cell responses, and cDC2, which mediate Th2 and Th17 responses. The likely human equivalents are CD141+ DC and CD1c+ DC subsets for mouse cDC1 and cDC2, respectively, but the extent of any interspecies differences is poorly characterized. Here, we exploit the fact that human CD141+ DC and CD1c+ DC develop in humanized mice, to further explore their equivalency in vivo. Global transcriptome analysis of CD141+ DC and CD1c+ DC isolated from humanized mice demonstrated that they closely resemble those in human blood. Activation of DC subsets in vivo, with the TLR3 ligand poly I:C, and the TLR7/8 ligand R848 revealed that a core panel of genes consistent with DC maturation status were upregulated by both subsets. R848 specifically upregulated genes associated with Th17 responses by CD1c+ DC, while poly I:C upregulated IFN-? genes specifically by CD141+ DC. MYCL expression, known to be essential for CD8+ T cell priming by mouse DC, was specifically induced in CD141+ DC after activation. Concomitantly, CD141+ DC were superior to CD1c+ DC in their ability to prime naïve antigen-specific CD8+ T cells. Thus, CD141+ DC and CD1c+ DC share a similar activation profiles in vivo but also have induce unique signatures that support specialized roles in CD8+ T cell priming and Th17 responses, respectively. In combination, these data demonstrate that humanized mice provide an attractive and tractable model to study human DC in vitro and in vivo.

Dataset Information

Differential gene expression in thrombomodulin (TM; CD141)(+) and TM(-) dendritic cell subsets.

Publications

Differential gene expression in thrombomodulin (TM; CD141)(+) and TM(-) dendritic cell subsets.

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