Abstract：
:6-Sulpho LacNAc dendritic cells (slanDC) are a major population of human blood DC that are highly pro-inflammatory, as characterized by their outstanding capacity to produce tumour necrosis factor-α and interleukin-12 (IL-12) and to prime antigen-specific T-cell responses. SlanDC were found to be present in inflamed tissue such as atopic dermatitis, where high levels of histamine are also present. As histamine is an important regulator of allergic inflammation we investigated the role of histamine receptors, particularly the most recently identified histamine H(4) receptor (H(4) R), in modulating the pro-inflammatory function of slanDC. The expression of H(4) R was evaluated by real-time PCR and flow cytometry. Cytokine production in response to H(4) R stimulation was assessed by intracellular flow cytometric staining and enzyme-linked immunosorbent assay. We show that slanDC express the H(1) R, H(2) R and H(4) R on mRNA and the H(4) R on protein level. No differences were observed in basal H(4) R expression in patients with atopic dermatitis and psoriasis, but in atopic dermatitis patients the H(4) R was up-regulated by interferon-γ. When stimulated with lipopolysaccharide in the presence of histamine, slanDC produced substantially lower levels of the pro-inflammatory cytokines tumour necrosis factor-α and IL-12, mediated solely via the H(4) R and via the combined action of H(2) R and H(4) R, respectively. In contrast, the production of IL-10 was not affected by histamine receptor activation on slanDC. The slanDC express the H(4) R and its stimulation leads to reduced pro-inflammatory capacity of slanDC. Hence, H(4) R agonists might have therapeutic potential to down-regulate immune reactions, e.g. in allergic inflammatory skin diseases.
journal_name
Immunologyjournal_title
Immunologyauthors
Gschwandtner M,Schäkel K,Werfel T,Gutzmer Rdoi
10.1111/j.1365-2567.2010.03336.xsubject
Has Abstractpub_date
2011-01-01 00:00:00pages
49-56issue
1eissn
0019-2805issn
1365-2567pii
IMM3336journal_volume
132pub_type
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