title: Distribution of MHC class II antigens in feline tissues and peripheral blood.
abstract: A new monoclonal antibody raised against gradient-purified feline immunodeficiency virus was found to recognize a bimolecular complex, comprising 27-29 kD and 32-35 kD subunits, on feline peripheral blood lymphocytes. Immunoperoxidase staining of feline tissues with this antibody, designated 43.2H2, demonstrated a reactivity pattern similar to that described for MHC II antigens of the dog, horse, and pig, but differed from human and mouse in having staining of T-cell zones in spleen and lymph nodes. Flow cytometric analysis revealed that 42.3H2 reacted with 88.97% +/- 16.00% of feline peripheral blood lymphocytes (n = 20). This high level of reactivity was found to be consistent by repeated sampling over a 4-month period. Two-color flow cytometric analysis was used to determined the reactivity pattern on lymphocyte subsets: 88.92% +/- 7.30% of CD4+ lymphocytes were 42.3H2-positive, while 85.99% +/- 11.46% of CD8+ cells were positive (n = 11 for both). B lymphocytes had the highest reactivity (99.47% +/- 0.45; n = 9) and also had the highest fluorescence intensity. By gating based on light scatter properties, 95.06% +/- 7.35% of monocytes were 42.3H2-reactive (n = 18), while granulocytes were negative.
authors.affiliation: Department of Medicine, School of Veterinary Medicine, University of California, Davis.
authors.forename: B A
authors.initials: BA
authors.lastname: Rideout
authors.forename: P F
authors.initials: PF
authors.lastname: Moore
authors.forename: N C
authors.initials: NC
authors.lastname: Pedersen
mesh_terms: D000818:Animals; D000911:Antibodies, Monoclonal / Q000276:immunology; D000914:Antibodies, Viral / Q000276:immunology; D002415:Cats / Q000097:blood / Q000276:immunology*; D005260:Female; D005434:Flow Cytometry; D000949:Histocompatibility Antigens Class II / Q000032:analysis*; D006801:Humans; D016089:Immunodeficiency Virus, Feline / Q000276:immunology; D016131:Lymphocyte Subsets / Q000276:immunology*; D008221:Lymphoid Tissue / Q000276:immunology; D008297:Male; D008322:Mammals / Q000276:immunology; D009928:Organ Specificity; D013045:Species Specificity; D013047:Specific Pathogen-Free Organisms
chemical_list: D000911:Antibodies, Monoclonal; D000914:Antibodies, Viral; D000949:Histocompatibility Antigens Class II