Taxifolin glycoside inhibits dendritic cell responses stimulated by lipopolysaccharide and lipoteichoic acid

Authors


Department of Pharmacology, College of Medicine, Chung-Ang University, Seoul 156-756, South Korea. E-mail: leecs@cau.ac.kr

Abstract

Antigen-presenting dendritic cells may play an important role in the pathogenesis of atopic dermatitis. Taxifolin is demonstrated to have anti-inflammatory effects. The present study was designed to assess the effect of taxifolin glycoside against stimulated responses of dendritic cells isolated from mouse bone marrow and spleen. Dendritic cells exposed to lipopolysaccharide, lipoteichoic acid or interleukin (IL)-1β exhibited increased production of IL-12 p70 and tumour necrosis factor alpha, increased formation of reactive oxygen species (ROS) and nitric oxide (NO), and elevation of intracellular Ca2+ levels. Treatment with taxifolin glycoside inhibited responses stimulated by the microbial products or IL-1β in dendritic cells in a dose-dependent manner. Taxifolin glycoside had a significant inhibitory effect on the production of cytokines, formation of ROS and NO, and change in intracellular Ca2+ levels in dendritic cells of bone marrow and spleen. The results show that taxifolin glycoside seems to inhibit the dendritic cell responses stimulated by microbial products and IL-1β, suggesting that taxifolin glycoside may exert an inhibitory effect against dendritic-cell-mediated immune responses.

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