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ToxSci Advance Access published online on January 23, 2006
Toxicological Sciences, doi:10.1093/toxsci/kfj092
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© The Author 2006. Published by Oxford University Press on behalf of the Society of Toxicology. All rights reserved. For Permissions, please email: journals.permissions@oxfordjournals.org
Received October 14, 2005
Accepted December 29, 2005

Environmental Toxicology

Organic Extracts of Urban Aerosol (≤ PM2.5) Enhance rBet v 1-Induced Upregulation of CD63 in Basophils from Birch Pollen Allergic Individuals

Wolfgang Schober 1 *, Benedetta Belloni 2, Stefanie Lubitz 2, Bernadette Eberlein-König 3, Patrick Bohn 4, Yücel Saritas 4, Jutta Lintelmann 4, Georg Matuschek 4, Heidrun Behrendt 2, and Jeroen Buters 2

1 Division of Environmental Dermatology and Allergy GSF/TUM, ZAUM - Center for Allergy and Environment, Technical University Munich, 80802 Munich, Germany; W.S. is a recipient of the Bayerische Habilitations-Förderpreis 2002 of the Bavarian Research Ministry
2 Division of Environmental Dermatology and Allergy GSF/TUM, ZAUM - Center for Allergy and Environment, Technical University Munich, 80802 Munich, Germany
3 Division of Environmental Dermatology and Allergy GSF/TUM, ZAUM - Center for Allergy and Environment, Technical University Munich, 80802 Munich, Germany; Department of Dermatology and Allergy, Biederstein, Technical University Munich, 80802 Munich, Germany
4 Institute of Ecological Chemistry, GSF-National Research Center for Environment and Health, 85764 Neuherberg, Germany

* To whom correspondence should be addressed.
Wolfgang Schober, E-mail: schober{at}lrz.tum.de


  Abstract

Background: Epidemiological studies have linked the high prevalence rates of IgE-mediated allergic diseases to an increase in exposure to traffic related air pollutants such as diesel exhaust particles (DEPs). There is growing experimental evidence that organic compounds of DEPs, predominantly polycyclic aromatic hydrocarbons (PAHs), participate in the development and maintenance of allergic airway diseases. In this study we investigated the impact of organic extracts of urban aerosol (AERex) containing various PAH concentrations on the activation of human basophils.

Methods: Whole blood samples from six birch pollen allergic and five control subjects were repeatedly incubated in the presence of AERex with or without rBet v 1. Basophils were analysed for CD63 expression as a measure of basophil activation by using multiparameter flow cytometry.

Results: Basophils, when exposed in vitro to AERex and rBet v 1, expressed CD63 significantly more than with antigen activation alone. AERex synergized with rBet v 1 in a dose-dependent manner, but did not activate basophils from non-allergic donors. AERex effect on CD63 upregulation was found in blood samples of all patients and did not occur in the absence of rBet v 1. Strongest basophil activation was monitored upon stimulation with AERex comprising the highest PAH content.

Conclusions: The capability of AERex to increase activation of basophils from birch pollen allergic subjects at ambient concentrations suggests an important role of organic compounds of airborne particles in the aggravation of IgE-mediated allergic diseases. This could be a new aspect of regulation of unspecific promoting stimuli in clinical manifestation of allergic inflammation.

Keywords: Basophils; CD63 expression; organic compounds of urban aerosol; PM2.5; IgE-mediated allergic diseases.
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