Emedastine difumarate, a new antiallergic agent, has both an antihistaminic and inhibitory effect on histamine release from rat peritoneal mast cells. In the present study, we examined the effects of emedastine on the chemotaxis of both guinea pig and human eosinophils which are considered to aggravate allergic inflammation. In addition, we compared the results those of ketotifen, azelastine and tranilast. At concentrations of 10
-8M or higher, either emedastine significantly inhibited leukotriene B
4- or platelet activating factor-induced chemotaxis of both the guinea pig and human eosinophils. Ketotifen and azelastine also showed significant inhibition at concentrations of 10
-6M or higher, while tranilast did not show any significant effect even at 10
-5M. These findings suggest that emedastine has a therapeutic effect on allergic diseases by inhibiting the infiltration of eosinophils into the inflammatory site.
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