title: Lymphocyte dynamic patterns in cattle during a primary infection with Cryptosporidium parvum.
abstract: Changes in intraepithelial (IEL), lamina propria (LPL), and draining lymph node (LNL) lymphocytes were assessed in 9-day-old calves during primary infection with Cryptosporidium parvum and in similarly aged noninfected calves. A very low percentage of both CD4+ and CD8+ T cells were found in IEL and LPL of noninfected calves. In infected compared to controls, percentages of CD2+, CD3+, CD4+, and CD8+ T cells in IEL exhibited a significant increase (P < 0.05), whereas the percentage of IL2R+ increased and the percentage of IgG+ cells decreased, but neither of these changes were statistically significant. In LPL, percentages of CD2+, CD3+, CD8+, and IL2R+ T cells were increased in infected compared to noninfected calves, whereas the percentage of IgG-bearing cells decreased; but only the increase in CD3+, CD8+, and IL2R+ cells was significant (P < or = 0.05). In LNL only minimal changes were seen. In fact, the percentage of CD2+ T cells increased whereas the percentage of CD8+ T cells decreased, but neither of these differences was statistically significant. These findings indicate that T cells subsets in the ileal mucosa of naive neonatal calves are different than those of adult cattle, and that the immune response to C. parvum infection differs in ileal mucosa when compared to the regional lymph nodes.
authors.affiliation: Immunology and Disease Resistance Laboratory, LPSI, ARS, USDA, Beltsville, Maryland 20705, USA.
authors.forename: P
authors.initials: P
authors.lastname: Pasquali
authors.forename: R
authors.initials: R
authors.lastname: Fayer
authors.forename: S
authors.initials: S
authors.lastname: Almeria
authors.forename: J
authors.initials: J
authors.lastname: Trout
authors.forename: G A
authors.initials: GA
authors.lastname: Polidori
authors.forename: L C
authors.initials: LC
authors.lastname: Gasbarre
mesh_terms: D000818:Animals; D000831:Animals, Newborn; D000911:Antibodies, Monoclonal / Q000276:immunology; D000918:Antibody Specificity; D002417:Cattle; D002418:Cattle Diseases / Q000276:immunology* / Q000473:pathology; D003457:Cryptosporidiosis / Q000276:immunology* / Q000473:pathology; D019084:Fluorescent Antibody Technique, Indirect / Q000662:veterinary; D007082:Ileum / Q000276:immunology / Q000473:pathology; D007111:Immunity, Cellular; D007413:Intestinal Mucosa / Q000276:immunology / Q000473:pathology; D008198:Lymph Nodes / Q000276:immunology / Q000473:pathology; D018655:Lymphocyte Count / Q000662:veterinary; D008297:Male; D016176:T-Lymphocyte Subsets / Q000473:pathology*
chemical_list: D000911:Antibodies, Monoclonal