title: Inhibition of equine neutrophil chemotaxis and chemokinesis by a Taenia taeniaeformis proteinase inhibitor, taeniaestatin.
abstract: Taeniaestatin, a recently isolated Taenia taeniaeformis proteinase inhibitor, was used to inhibit equine neutrophil migration. Taeniaestatin itself was not chemotactic when used as a chemotactic factor but taeniaestatin did inhibit neutrophil chemokinesis when tested in a Zigmond-Hirsch checkerboard assay. A dose-dependent inhibition of both chemokinesis and chemotaxis was observed when zymosan activated bovine sera (ZABS) was used as the chemotactic factor. This inhibition was greater than 95% when 5 mu of taeniaestatin was present on both the cell and chemotactic factor side of the chambers. Equine neutrophils gave dose- and time-dependent migration responses to purified bovine C5a with an ED50 of 1.04 X 10(-7)M. Taeniaestatin inhibited the C5a-mediated chemotactic and chemokinetic neutrophil responses (51% using 1 mu and greater than 95% with 5 mu of taeniaestatin). The inhibition of leucocyte motility by taeniaestatin was reversible and without cytotoxicity at the highest doses of taeniaestatin tested.
mesh_terms: D000818:Animals; D002630:Chemotactic Factors / Q000494:pharmacology; D002634:Chemotaxis, Leukocyte / Q000187:drug effects*; D004305:Dose-Response Relationship, Drug; D015801:Helminth Proteins; D006736:Horses; D007447:Invertebrate Hormones / Q000494:pharmacology*; D007770:L-Lactate Dehydrogenase / Q000378:metabolism; D009504:Neutrophils / Q000187:drug effects* / Q000378:metabolism; D013621:Taenia / Q000502:physiology
chemical_list: D002630:Chemotactic Factors; D015801:Helminth Proteins; D007447:Invertebrate Hormones; C049998:taeniaestatin; D007770:L-Lactate Dehydrogenase