title: Excretory-secretory products of Giardia lamblia.
abstract: The surface of Giardia lamblia strain WB was radioiodinated with either 1,3,4,6-tetrachloro-3 alpha, 6 alpha-diphenylglycoluril (IODOGEN) or lactoperoxidase, and the labeled membrane components as well as the released excretory-secretory (E-S) products were identified. The surface of G. lamblia was easily labeled, and G. lamblia excretory-secretory (E-S) products were identified in the medium. Over 70% of the label on the cell surface was released over 24 hr. The major E-S product released was polydisperse (m.w. 225 to 94,000), protease VI and periodate-sensitive, chloroform-methanol insoluble, and failed to adhere to a series of carbohydrate-binding lectins or to diethylaminoethyl (DEAE) cellulose. Hydrophobicity was suggested by adherence to phenyl-Sepharose. The major E-S product of another G. lamblia isolate, Portland-1 (P-1), was antigenically different. A previous study showed that strain P-1 lacked a major antigenic component of strain WB. In the present study, this material was identified as the major secretory product of WB by crossed immunoelectrophoresis.
mesh_terms: D000818:Animals; D000937:Antigen-Antibody Reactions; D000941:Antigens / Q000032:analysis*; D002846:Chromatography, Affinity; D004591:Electrophoresis, Polyacrylamide Gel; D005872:Giardia / Q000254:growth & development / Q000276:immunology* / Q000378:metabolism; D005873:Giardiasis / Q000276:immunology; D006801:Humans; D008297:Male; D008565:Membrane Proteins / Q000032:analysis / Q000276:immunology*; D008970:Molecular Weight; D011817:Rabbits
chemical_list: D000941:Antigens; D008565:Membrane Proteins