6-Methoxyluteolin

6-Methoxyluteolin has antioxidant activity, it is a potent inhibitor of histamine release and calcium influx via down-regulation of the FcεRI α chain.Using the human basophilic KU812F cells, we assessed the inhibitory effects of 6-Methoxyluteolin, isolated from Chrysanthemum zawadskii, in the FcαμRI-mediated allergic reaction. We determined that 6-Methoxyluteolin inhibited anti-FcαμRI α± chain antibody (CRA-1) -induced histamine release, as well as elevation of intracellular calcium concentration [Ca2+]i in a dose-dependent manner. Moreover, the inhibitory effects of 6-Methoxyluteolin on the cell surface expression and the mRNA level of the FcαμRI α± chain were determined by flow cytometric analysis and reverse transcription-polymerase chain reaction (RTPCR), respectively.