title: At least two loci encode polymorphic class I MHC antigens in the horse.
abstract: Six monoclonal antibodies and ten alloantisera were used to precipitate cell surface molecules of approximately 44 kDa (class I MHC antigens) from radiolabelled equine peripheral blood lymphocytes. All ten antisera were raised against antigens of a single donor horse (horse 0834, ELA-A2,-A2). Four methods of producing antisera were compared: one or two pregnancies, skin allografting, and skin grafting followed by pregnancy. Immunization by pregnancy appeared to produce antibodies against class I products only, while skin grafting raised antibodies to class II antigens as well. Nine of the antisera were raised across an entire MHC haplotype barrier, while one recipient carried the ELA-A2 antigen of the donor. The pregnancy antiserum raised across this barrier probably identifies a second polymorphic class I locus in the horse. Sequential immunoprecipitation using this antiserum in the first stage and an anti-MHC haplotype antiserum or monoclonal antibody reagent in the second stage supported this hypothesis. Gene products of this second ELA class I locus are immunogenic in pregnancy.
authors.affiliation: James A. Baker Institute for Animal Health, New York State College of Veterinary Medicine, Cornell University, Ithaca 14853.
authors.forename: W L
authors.initials: WL
authors.lastname: Donaldson
authors.forename: A L
authors.initials: AL
authors.lastname: Crump
authors.forename: C H
authors.initials: CH
authors.lastname: Zhang
authors.forename: J
authors.initials: J
authors.lastname: Kornbluth
authors.forename: M
authors.initials: M
authors.lastname: Kamoun
authors.forename: W
authors.initials: W
authors.lastname: Davis
authors.forename: D F
authors.initials: DF
authors.lastname: Antczak
mesh_terms: D000818:Animals; D000911:Antibodies, Monoclonal; D004591:Electrophoresis, Polyacrylamide Gel / Q000662:veterinary; D005260:Female; D015395:Histocompatibility Antigens Class I / Q000235:genetics*; D006736:Horses / Q000235:genetics* / Q000276:immunology; D007114:Immunization / Q000379:methods / Q000662:veterinary; D007518:Isoantibodies / Q000276:immunology; D008214:Lymphocytes / Q000276:immunology; D008285:Major Histocompatibility Complex; D008297:Male; D011110:Polymorphism, Genetic; D011233:Precipitin Tests / Q000662:veterinary; D011247:Pregnancy; D016038:Skin Transplantation; D014181:Transplantation Immunology
chemical_list: D000911:Antibodies, Monoclonal; D015395:Histocompatibility Antigens Class I; D007518:Isoantibodies