文摘
The aim of this study was to evaluate whether citreorosein (CIT), a naturally occurring anthraquinone isolated from Polygoni cuspidati (P. cuspidati) radix, modulates degranulation and 5-lipoxygenase (5-LO)-dependent leukotriene C4 (LTC4) generation in mast cells. Cit suppresses both degranulation and the generation of LTC4 in a dose-dependent manner in stem cell factor (SCF)-mediated mouse bone marrow-derived mast cells (BMMCs). With regard to its molecular mechanism of action, we investigated the effects of CIT on intracellular signaling and mast cell activation employing BMMCs. Binding of SCF to c-Kit on mast cell membranes induced increases in intrinsic tyrosine kinase Syk activity and activation of multiple downstream events including phosphorylation of phospholipase Cγ (PLCγ), mobilization of intracellular Ca2+, phosphatidylinositol 3-kinase (PI3K), Akt, MAP kinases (MAPKs), translocation of phospho-phospholipase A2 (PLA2) and 5-LO. The results from the biochemical analysis demonstrate that CIT attenuates degranulation and LTC4 generation through the suppression of multiple step signaling and would be beneficial for the prevention of allergic inflammation.