title: Identification of T-cell stimulating antigens from Giardia lamblia by using Giardia-specific T-cell hybridomas.
abstract: T-cell immune response plays an important role in controlling Giardia lamblia infections. Little is known about the G. lamblia-specific antigens that stimulate a cell-mediated immune response. The aim of the present study was to identify T-cell stimulating G. lamblia antigens. For this purpose, we generated a group of Giardia-specific T-cell hybridomas (2F9, 4D5, 6D10, 8B9, 9B10, 10F7 and 10G5). Hybridomas were screened for reactivity with G. lamblia protein extract by the CTLL bioassay. These T-cell hybridomas did not exhibit any significant activation either in the absence of G. lamblia protein extract or in the presence of irrelevant antigen (hen white egg lysozyme). To further characterize the T-cell hybridomas generated, we selected three hybridomas (10G5, 4D5 and 9B10). Giardia lamblia proteins of 90-110, 65-77 and 40-64 kDa showed T-cell stimulating activity for the hybridomas 10G5, 4D5 and 9B10, respectively, in a concentration-dependent manner. Protein extract obtained from different G. lamblia strains (GS/M-83-H7, WB C6 and a clinical isolate (YJJ)) stimulated all T-cell hybridomas, indicating that T-cell-stimulating antigens are expressed among different G. lamblia strains. In conclusion, we identified T-cell stimulating G. lamblia antigens by using Giardia-specific T-cell hybridomas. To our knowledge, these hybridomas are the first-described T-cell hybridomas specific for G. lamblia.
authors.affiliation: Centro de Investigación en Alimentación y Desarrollo A.C. Hermosillo, Sonora, México.
authors.forename: H
authors.initials: H
authors.lastname: Astiazaran-Garcia
authors.forename: J
authors.initials: J
authors.lastname: Quintero
authors.forename: R
authors.initials: R
authors.lastname: Vega
authors.forename: P
authors.initials: P
authors.lastname: Briceño
authors.forename: C
authors.initials: C
authors.lastname: Oviedo
authors.forename: L
authors.initials: L
authors.lastname: Rascon
authors.forename: A
authors.initials: A
authors.lastname: Garibay-Escobar
authors.forename: F J
authors.initials: FJ
authors.lastname: Castillo-Yañez
authors.forename: R
authors.initials: R
authors.lastname: Robles-Zepeda
authors.forename: J
authors.initials: J
authors.lastname: Hernandez
authors.forename: C
authors.initials: C
authors.lastname: Velazquez
mesh_terms: D000818:Animals; D000953:Antigens, Protozoan / Q000737:chemistry / Q000276:immunology* / Q000302:isolation & purification; D045744:Cell Line, Tumor; D016829:Giardia lamblia / Q000276:immunology*; D006825:Hybridomas; D008213:Lymphocyte Activation / Q000276:immunology*; D051379:Mice; D008809:Mice, Inbred C3H; D008970:Molecular Weight; D015800:Protozoan Proteins / Q000737:chemistry / Q000276:immunology* / Q000302:isolation & purification; D013601:T-Lymphocytes / Q000276:immunology*
chemical_list: D000953:Antigens, Protozoan; D015800:Protozoan Proteins