title: Effect of cetirizine on human eosinophil superoxide generation, eosinophil chemotaxis and eosinophil peroxidase in vitro.
abstract: Cetirizine, a potent H1-antagonist, has been reported to inhibit eosinophil migration into human skin. We, therefore, further evaluated the effect of cetirizine on eosinophil function, including superoxide anion generation, chemotaxis, and eosinophil peroxidase (EP) release. In allergic subjects, superoxide anion generation 60 min after platelet-activating factor (PAF) activation was inhibited by concentrations of cetirizine ranging from 0.01 to 1 microgram/ml (2.612 x 10(-8) to 2.612 x 10(-6) M). No significant inhibition was observed in normal subjects. PAF (10(-6) M)-induced eosinophil chemotaxis was also inhibited by cetirizine. In allergic subjects, percent inhibitions were 47.5 +/- 6.1% at 0.01 microgram/ml, 50.8 +/- 5.1% at 0.1 microgram/ml and 58.9 +/- 6.4% at 1 microgram/ml of cetirizine. In allergic subjects, N-formyl-methionyl-lencyl-phenylalanine induced eosinophil chemotaxis was inhibited by cetirizine, although EP release was not. These results suggest cetirizine has effects on eosinophils which can not be explained by H1-blockade alone.
authors.affiliation: Allergic Disease Center, Creighton University School of Medicine, Omaha, NB 68178.
authors.forename: C
authors.initials: C
authors.lastname: Okada
authors.forename: R
authors.initials: R
authors.lastname: Eda
authors.forename: H
authors.initials: H
authors.lastname: Miyagawa
authors.forename: H
authors.initials: H
authors.lastname: Sugiyama
authors.forename: R J
authors.initials: RJ
authors.lastname: Hopp
authors.forename: A K
authors.initials: AK
authors.lastname: Bewtra
authors.forename: R G
authors.initials: RG
authors.lastname: Townley
mesh_terms: D000328:Adult; D017332:Cetirizine / Q000494:pharmacology*; D002634:Chemotaxis, Leukocyte / Q000187:drug effects*; D047209:Eosinophil Peroxidase; D004804:Eosinophils / Q000201:enzymology / Q000502:physiology*; D005260:Female; D006801:Humans; D006967:Hypersensitivity / Q000503:physiopathology*; D008297:Male; D008875:Middle Aged; D010544:Peroxidases / Q000097:blood*; D010972:Platelet Activating Factor / Q000494:pharmacology; D013481:Superoxides / Q000378:metabolism*
chemical_list: D010972:Platelet Activating Factor; D013481:Superoxides; D047209:Eosinophil Peroxidase; D010544:Peroxidases; D017332:Cetirizine