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Gilles, S. ; Jacoby, D.R. ; Blume, C. ; Mueller, M.J.* ; Jakob, T.* ; Behrendt, H. ; Schaekel, K.* ; Traidl-Hoffmann, C.

Pollen-derived low-molecular weight factors inhibit 6-sulfo LacNAc⁺ dendritic cells' capacity to induce T-helper type 1 responses.

Clin. Exp. Allergy 40, 269-278 (2010)
DOI PMC
Open Access Green as soon as Postprint is submitted to ZB.
Evidence is accumulating that the pollen exsudate contains an array of non-allergenic, pro-inflammatory and immunomodulatory substances acting on the innate and adaptive immune system. In this context, pollen-associated E(1)-phytoprostanes (PPE(1)) were shown to licence human monocyte-derived dendritic cells for T-helper type 2 (Th2) polarization of naïve T cells. This study aims at analysing the impact of pollen-associated lipid mediators on cytokine secretion and maturation of 6-sulfo LacNAc(+) dendritic cells (slanDCs), the most abundant native dendritic cell (DC) in human peripheral blood, and further dissecting the biologically active substance(s) within aqueous pollen extracts. Aqueous birch pollen extracts dose-dependently inhibited the lipopolysaccharide (LPS)-induced IL-12 p70 production, while the levels of IL-6 remained unaffected. PPE(1) inhibited secretion of both IL-12 p70 and IL-6. Aqueous pollen extracts, but not PPE(1) or F(1)-phytoprostanes significantly reduced the LPS-induced surface expression of the maturation markers CD80, CD83, CD40 and CCR-7, an effect that was independent of proteins and that was still present in a 3 kDa cut-off fraction of the pollen extract. These effects were observed irrespective of the atopy status of the donors. Finally, slanDCs exposed to aqueous pollen extracts were impaired in eliciting an IFN-gamma response in naïve CD4(+) T cells. Our data show that slanDCs, a subset of human blood DCs with constitutively high potency to induce Th1 responses, are susceptible to the Th2 polarizing effect of low molecular weight, non-protein factors derived from pollen.
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Publication type Article: Journal article
Document type Scientific Article
Keywords allergy; IL-12; maturation; pollen-associated lipid mediators; slanDC
ISSN (print) / ISBN 0954-7894
e-ISSN 1365-2222
Journal Clinical & Experimental Allergy
Quellenangaben Volume: 40, Issue: 2, Pages: 269-278 Article Number: , Supplement: ,
Publisher Wiley
Reviewing status Peer reviewed
Institute(s) Institute of Lung Health and Immunity (LHI)
Institute of Epidemiology (EPI)