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Gutermuth, J. ; Bewersdorff, M.* ; Traidl-Hoffmann, C. ; Ring, J.* ; Mueller, M.J. ; Behrendt, H. ; Jakob, T.

Immunomodulatory effects of aqueous birch pollen extracts and phytoprostanes on primary immune responses in vivo.

J. Allergy Clin. Immunol. 120, 293-299 (2007)
DOI PMC
Open Access Green as soon as Postprint is submitted to ZB.
We recently demonstrated that pollen not only function as allergen carriers but also as rich sources of bioactive lipids, such as phytoprostanes, that modulate human dendritic cell (DC) function in a way that results in an enhanced T(H)2 polarization in vitro. OBJECTIVE: Here we analyzed the immunomodulatory capacities of Betula alba (white birch) aqueous pollen extracts (Bet-APEs) and pollen-associated phytoprostanes in the murine system in vitro and in vivo. METHODS: DC function was analyzed in vitro by using BALB/c bone marrow-derived DCs. T-cell responses were analyzed with DO11.10 peptide 323-339 from chicken ovalbumin (OVA)-specific CD4 T cells as responder cells. For in vivo studies, OVA-specific CD4 T cells were adoptively transferred into BALB/c mice. Twenty-four hours later, mice were challenged by means of intranasal application of OVA in the absence or presence of Bet-APEs or phytoprostanes. Polarization of T-cell responses in vivo was analyzed in draining lymph node cells. RESULTS: In vitro Bet-APEs and E(1)-phytoprostanes dose-dependently inhibited LPS-induced IL-12p70 of DCs. In addition, Bet-APEs induced a T(H)2 polarization in vitro. Similarly, intranasal instillation of Bet-APEs in vivo, together with the antigen, lead to increased IL-4, IL-5, and IL-13 secretion and decreased IFN-gamma secretion from antigen-specific T cells in the draining lymph nodes. In contrast, intranasal E1- and F1-phytoprostanes downregulated both T(H)1 and T(H)2 cytokine production in vivo. CONCLUSION: Pollen release water-soluble factors that display T(H)2-polarizing capacities in vivo independently of E(1)- and F(1)-phytoprostanes. CLINICAL IMPLICATIONS: Identification of the underlying mechanisms might open new approaches for pharmacologic intervention.
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Publication type Article: Journal article
Document type Scientific Article
Corresponding Author
Keywords TH1/TH2 cells; T-cell polarization; pollen allergy; phytoprostanes; pollen-associated lipid mediators
ISSN (print) / ISBN 0091-6749
e-ISSN 1097-6825
Journal The journal of allergy and clinical immunology
Quellenangaben Volume: 120, Issue: 2, Pages: 293-299 Article Number: , Supplement: ,
Publisher Elsevier
Publishing Place Amsterdam [u.a.]
Non-patent literature Publications
Reviewing status Peer reviewed
Institute(s) Institute of Lung Health and Immunity (LHI)
Institute of Epidemiology (EPI)