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An investigation into IgE-facilitated allergen recognition and presentation by human dendritic cells

Sharquie, Inas K.; Al-Ghouleh, Abeer; Fitton, Patricia; Clark, Mike R.; Armour, Kathryn L.; Sewell, Herb F.; Shakib, Farouk; Ghaemmaghami, Amir M.

Authors

Inas K. Sharquie

Abeer Al-Ghouleh

Patricia Fitton

Mike R. Clark

Kathryn L. Armour

Herb F. Sewell

Farouk Shakib



Abstract

Background: Allergen recognition by dendritic cells (DCs) is a key event in the allergic cascade leading to production of IgE antibodies. C-type lectins, such as the mannose receptor and DC-SIGN, were recently shown to play an important role in the uptake of the house dust mite glycoallergen Der p 1 by DCs. In addition to mannose receptor (MR) and DC-SIGN the high and low affinity IgE receptors, namely FcϵRI and FcϵRII (CD23), respectively, have been shown to be involved in allergen uptake and presentation by DCs.

Objectives: This study aims at understanding the extent to which IgE- and IgG-facilitated Der p 1 uptake by DCs influence T cell polarisation and in particular potential bias in favour of Th2. We have addressed this issue by using two chimaeric monoclonal antibodies produced in our laboratory and directed against a previously defined epitope on Der p 1, namely human IgE 2C7 and IgG1 2C7.

Results: Flow cytometry was used to establish the expression patterns of IgE (FcϵRI and FcϵRII) and IgG (FcγRI) receptors in relation to MR on DCs. The impact of FcϵRI, FcϵRII, FcγRI and mannose receptor mediated allergen uptake on Th1/Th2 cell differentiation was investigated using DC/T cell co-culture experiments. Myeloid DCs showed high levels of FcϵRI and FcγRI expression, but low levels of CD23 and MR, and this has therefore enabled us to assess the role of IgE and IgG-facilitated allergen presentation in T cell polarisation with minimal interference by CD23 and MR. Our data demonstrate that DCs that have taken up Der p 1 via surface IgE support a Th2 response. However, no such effect was demonstrable via surface IgG.

Conclusions: IgE bound to its high affinity receptor plays an important role in Der p 1 uptake and processing by peripheral blood DCs and in Th2 polarisation of T cells.

Journal Article Type Article
Publication Date Dec 13, 2013
Journal BMC Immunology
Electronic ISSN 1471-2172
Publisher Humana Press
Peer Reviewed Peer Reviewed
Volume 14
Issue Decemb
Article Number 12
APA6 Citation Sharquie, I. K., Al-Ghouleh, A., Fitton, P., Clark, M. R., Armour, K. L., Sewell, H. F., …Ghaemmaghami, A. M. (2013). An investigation into IgE-facilitated allergen recognition and presentation by human dendritic cells. BMC Immunology, 14(Decemb), doi:10.1186/1471-2172-14-54
DOI https://doi.org/10.1186/1471-2172-14-54
Keywords Allergen, Dendritic cells, Der p 1, IgG, IgE
Publisher URL http://www.biomedcentral.com/1471-2172/14/54
Copyright Statement Copyright information regarding this work can be found at the following address: http://creativecommons.org/licenses/by/4.0

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Copyright Statement
Copyright information regarding this work can be found at the following address: http://creativecommons.org/licenses/by/4.0





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