title: Reference values for relative numbers of natural killer cells in cattle blood.
abstract: Natural killer (NK) cells have been studied in humans and rodents for almost 30 years, but little is known about NK cells in other mammals, such as cattle. Recently, a monoclonal antibody directed against bovine NKp46, a receptor that is expressed exclusively on NK cells, was developed. We have utilized this antibody to study the relative numbers of NK cells in blood of 254 cattle at different ages. The highest relative number of NK cells was observed in young calves, and gradually decreased with age to a bottom level in heifers, followed by a moderate increase in adults. Relative numbers of NK cells in cattle were generally lower than in humans, but age-related changes in bovine NK cells showed similar tendencies as reported in humans. The present material provides a source for reference values for NK cells in cattle at various ages.
authors.affiliation: Department of Food Safety and Infection Biology, The Norwegian School of Veterinary Science, P.O. Box 8146, Dep., Oslo 0033, Norway. siri.kulberg@veths.no
authors.forename: Siri
authors.initials: S
authors.lastname: Kulberg
authors.forename: Preben
authors.initials: P
authors.lastname: Boysen
authors.forename: Anne K
authors.initials: AK
authors.lastname: Storset
mesh_terms: D000367:Age Factors; D000818:Animals; D000911:Antibodies, Monoclonal; D002417:Cattle / Q000276:immunology*; D005434:Flow Cytometry; D016130:Immunophenotyping; D007694:Killer Cells, Natural / Q000166:cytology*; D007958:Leukocyte Count / Q000592:standards*; D011971:Receptors, Immunologic / Q000276:immunology; D012016:Reference Values; D016176:T-Lymphocyte Subsets / Q000166:cytology
chemical_list: D000911:Antibodies, Monoclonal; D011971:Receptors, Immunologic