Antiallergic asthma properties of Brazilin through inhibition of T H2 responses in T cells and in a murine model of asthma
Journal
Journal of Agricultural and Food Chemistry
Journal Volume
60
Journal Issue
37
Pages
9405-9414
Date Issued
2012
Author(s)
Lee C.-C.
Wang C.-N.
Kang J.-J.
Liao J.-W.
Chen H.-C.
Hu C.-M.
Lin C.-D.
Huang S.-H.
Lai Y.-T.
Abstract
This study aimed to determine whether brazilin exhibits anti-inflammatory effects that inhibit T helper cell type II (T(H)2) responses and whether it suppresses allergic inflammation reactions in a murine model of asthma. We found that brazilin inhibited the mRNA and protein expression of interleukin (IL)-4 and IL-5 induced by phorbol myristate acetate (PMA) and cAMP in EL-4 T cells in a dose-dependent manner. Following the intratracheal instillation of brazilin in ovalbumin (OVA)-immunized mice, we found that brazilin-treated mice exhibited decreases in the release of IL-4, IL-5, IL-13, eotaxin-1, and tumor necrosis factor-α in bronchoalveolar lavage fluid (BALF); inhibited T(H)2 functioning via a decrease in IL-4 production; and exhibited attenuation of OVA-induced lung eosinophilia, airway hyperresponsiveness, and airway remodeling. These results suggest that brazilin exhibits anti-T(H)2 effects both in vitro and in vivo and may possess therapeutic potential for allergic diseases.
SDGs
Type
review