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Evidence-Based Complementary and Alternative Medicine
Volume 2013 (2013), Article ID 127105, 7 pages
http://dx.doi.org/10.1155/2013/127105
Research Article

Inhibitory Action of Quercetin on Eosinophil Activation In Vitro

1Graduate School of Nursing and Rehabilitation Sciences, Showa University Graduate School, Yokohama, Kanagawa 226-8555, Japan
2Bio-Thera Clinic, Shinjuku, Tokyo 162-0022, Japan
3Division of Physiology, School of Nursing and Rehabilitation Sciences, Showa University, Yokohama, Kanagawa 226-8555, Japan

Received 11 March 2013; Revised 15 May 2013; Accepted 22 May 2013

Academic Editor: Tanawan Kummalue

Copyright © 2013 Misako Sakai-Kashiwabara and Kazuhito Asano. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

The influence of quercetin on eosinophil functions was examined in vitro and in vivo. The first set of experiments was undertaken to examine whether quercetin could suppress eosinophilia and IgE hyperproduction induced by Mesocestoides corti infection in BALB/c mice. The number of peripheral blood eosinophils and IgE levels were examined 21 days after infection. Oral administration of quercetin for 21 days could not suppress both peripheral blood eosinophilia and IgE hyperproduction, even when 20.0 mg/kg quercetin was used for treatment. The second part of the experiment was designed to examine the influence of quercetin on eosinophil activation induced by SCF stimulation in vitro. Eosinophils were obtained from M. corti-infected mice and stimulated with SCF in the presence of various concentrations of quercetin for 24 h. The addition of quercetin into cell cultures could suppress eosinophil activation induced by SCF stimulation as assessed by measuring the contents of RANTES, MIP-1β, ECP, and MBP in culture supernatants. The minimum concentration of quercetin which caused significant suppression of factor secretion was 5.0 μM. These results may suggest that quercetin will be a good candidate for the supplement on the management of eosinophil-mediated diseases, such as allergic rhinitis and asthma.