Table of Contents Author Guidelines Submit a Manuscript
BioMed Research International
Volume 2013, Article ID 735835, 12 pages
http://dx.doi.org/10.1155/2013/735835
Research Article

Suppression of Osteopontin Functions by Levocetirizine, a Histamine Receptor Antagonist, In Vitro

1Department of Otorhinolaryngology, School of Medicine, Showa University, 1-5-8 Hatanodai, Shinagawa-ku, Tokyo 142-8555, Japan
2Division of Physiology, School of Nursing and Rehabilitation Sciences, Showa University, Yokohama 226-8555, Japan

Received 25 September 2013; Revised 27 November 2013; Accepted 27 November 2013

Academic Editor: Hiroto Matsuse

Copyright © 2013 Toshimitsu Komatsuzaki et al. 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

Objectives. Osteopontin (OPN), a multifunctional glycoprotein secreted from a wide variety of cells after inflammatory stimulation, is well accepted to contribute to the development of allergic diseases. However, the influence of histamine H1 receptor antagonists (antihistamines) on OPN functions is not well understood. The present study was undertaken to examine the influence of antihistamines on OPN functions in vitro. Methods. Human nasal epithelial cells (  cells) were stimulated with 250 ng/mL OPN in the presence of either desloratadine (DL), fexofenadine (FEX), or levocetirizine (LCT). The levels of OPN, GM-CSF, Eotaxin, and RANTES in 24 h culture supernatants were examined by ELISA. The influence of LCT on mRNA expression and transcription factor activation in cells were also examined by real-time RT-PCR and ELISA, respectively. Key Findings. The antihistamines examined significantly suppressed the production of GM-CSF, Eotaxin, and RANTES from cells after OPN stimulation. LCT also exhibited the suppression of mRNA expression for chemokines and transcription factor, NF-κB and AP-1, activation, which were increased by the stimulation of cells with OPN. Conclusions. The suppressive activity of LCT on OPN functions on nasal epithelial cells may be responsible for the attenuating effect of the agent on allergic diseases.