title: Demonstration of equine immunoglobulin in sera from severe combined immunodeficiency/beige mice inoculated with equine lymphocytes.
abstract: Peripheral blood lymphocytes were isolated from four normal adult horses on Ficoll-Hypaque density gradients for intraperitoneal inoculation into 16 C.B-17 severe combined immunodeficiency/beige mice in an attempt to create a xenogeneic lymphoid chimera for modeling the equine immune system. The recipient mice had been preconditioned by prior exposure to 200 cGy of gamma irradiation. The mice were monitored for the presence of equine IgG using an ELISA technique. Equine IgG was detected in the sera of 91.7% of murine recipients and in at least one mouse inoculated from each donor horse. The levels of IgG detected in the mice ranged from 2 micrograms ml-1 to over 1000 micrograms ml-1 and showed steady decline from the time of inoculation to the end of the trial. The half-life of equine IgG in the SCID/beige mouse was determined to be 12.1 days by the intravenous injection of 9.1 mg of semi-purified equine IgG into 21 normal SCID/beige mice and taking serial blood samples to obtain the decay curve. The half-life of equine IgG was compared with the extinction curve obtained for the engrafted mice and showed that continuous production within the mice must have been occurring since the slopes of the two lines were different. These results are compared with those achieved in equine PBL-SCID/beige chimeras not preconditioned by irradiation and to those achieved in human and bovine PBL-SCID chimeras.
authors.affiliation: Department of Pathology, University of Guelph, Ont., Canada.
authors.forename: G A
authors.initials: GA
authors.lastname: Balson
authors.forename: B A
authors.initials: BA
authors.lastname: Croy
authors.forename: T L
authors.initials: TL
authors.lastname: Ross
authors.forename: J A
authors.initials: JA
authors.lastname: Yager
mesh_terms: D000818:Animals; D000921:Antibody-Producing Cells / Q000276:immunology; D001402:B-Lymphocytes / Q000276:immunology*; D004797:Enzyme-Linked Immunosorbent Assay / Q000662:veterinary; D006207:Half-Life; D006736:Horses / Q000276:immunology*; D007074:Immunoglobulin G / Q000097:blood*; D016219:Immunotherapy, Adoptive; D051379:Mice; D016513:Mice, SCID; D011993:Recombinant Fusion Proteins / Q000276:immunology; D016511:Severe Combined Immunodeficiency / Q000276:immunology*
chemical_list: D007074:Immunoglobulin G; D011993:Recombinant Fusion Proteins