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The mistletoe  Loranthus parasiticus  has been used as a compound for traditional medicine in Northeast Asia for a long time and is known to possess neuroprotective action. Nonetheless, the effect of  Loranthus parasiticus  on allergic responses remains unknown. In the present study, we evaluated whether the water extract of  Loranthus parasiticus  (LPE) could inhibit IgE-mediated allergic responses in RBL-2H3 cells. LPE inhibited the release of  β -hexosaminidase (IC 50 , 184.5  μ g/mL) and the formation of tumor necrosis factor- α  (IC 50 , 84.27  μ g/mL), interleukin-4 (IC 50 , 93.43  μ g/mL), prostaglandin E 2  (IC 50 , 84.10  μ g/mL), prostaglandin D 2 , and leukotriene C 4  (IC 50 , 43.27  μ g/mL) in a concentration-dependent manner. Moreover, LPE inhibited phosphorylation of Syk, PLC γ 1/2, PKC δ , ERK, JNK, p38, and Akt. In the late phase, LPE decreased 5-lipoxygenase phosphorylation and COX-2 expression but not cPLA 2  phosphorylation. Additionally, LPE included total phenolic compounds (10.72 mg/g dry weight) and total flavonoids (56.20 mg/g dry weight). These results suggest that the phenolic compounds or flavonoids contained in LPE may be associated with antiallergic activity. The phenolic compounds and flavonoids in LPE are antiallergic phytochemicals capable of inhibiting the activation of the Fc ε RI signaling cascade in mast cells. Such effects may provide further information for the development of a phytomedicine for allergic diseases.

Inhibitory Effect ofLoranthus parasiticuson IgE-Mediated Allergic Responses in RBL-2H3 Cells