title: Breed differences in humoral and cellular responses of lambs to experimental infection with the gastrointestinal nematode Teladorsagia circumcincta.
abstract: While Texel lambs have increased resistance to infection with the gastrointestinal nematode Teladorsagia circumcincta compared to Suffolk lambs, the underlying resistance mechanisms are still unknown. The aim of this study was to compare parasitological, humoral and cellular responses of Texel and Suffolk lambs over time following a single experimental infection with T. circumcincta. Gastrointestinal nematode free (but not naïve) lambs received a single oral dose of 3 × 104 infective T. circumcincta larvae. The variables examined included worm burden, mucosal and serum IgA, abomasal mast cells and eosinophils, haematological parameters and plasma pepsinogen. Texel lambs had significantly lower worm burden on day 14 and lower plasma pepsinogen concentration from day 14 onwards than Suffolks and their response in mucosal IgA to infection occurred earlier. The results from the study suggest that an earlier local IgA response in the Texel contributes to the resistant characteristics of the breed, while the increased level of plasma pepsinogen in the Suffolk lambs implies greater abomasal tissue damage arising from the nematode infection.
authors.forename: Albin Mostaque
authors.initials: AM
authors.lastname: Ahmed
authors.forename: Simone Rocco
authors.initials: SR
authors.lastname: Sebastiano
authors.forename: Torres
authors.initials: T
authors.lastname: Sweeney
authors.forename: James Patrick
authors.initials: JP
authors.lastname: Hanrahan
authors.forename: Assumpta
authors.initials: A
authors.lastname: Glynn
authors.forename: Orla Mary
authors.initials: OM
authors.lastname: Keane
authors.forename: Anindya
authors.initials: A
authors.lastname: Mukhopadhya
authors.forename: Kevin
authors.initials: K
authors.lastname: Thornton
authors.forename: Barbara
authors.initials: B
authors.lastname: Good
mesh_terms: D000018:Abomasum / Q000378:metabolism; D000818:Animals; D015415:Biomarkers / Q000097:blood / Q000378:metabolism; D060467:Disease Resistance; D004198:Disease Susceptibility / Q000276:immunology / Q000469:parasitology / Q000662:veterinary*; D005753:Gastric Mucosa / Q000378:metabolism; D007111:Immunity, Cellular; D056724:Immunity, Humoral; D012756:Sheep; D012757:Sheep Diseases / Q000235:genetics / Q000276:immunology* / Q000469:parasitology; D014251:Trichostrongyloidea / Q000502:physiology*; D014252:Trichostrongyloidiasis / Q000235:genetics / Q000276:immunology / Q000469:parasitology / Q000662:veterinary*
chemical_list: D015415:Biomarkers
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