Immune mechanisms of Texel sheep to adult and egg stages of Haemonchus contortus.
Haemonchus contortus
parasite
peripheral blood mononuclear cells
ruminant
Journal
Parasite immunology
ISSN: 1365-3024
Titre abrégé: Parasite Immunol
Pays: England
ID NLM: 7910948
Informations de publication
Date de publication:
10 2021
10 2021
Historique:
revised:
05
06
2021
received:
11
04
2021
accepted:
05
08
2021
pubmed:
11
8
2021
medline:
26
11
2021
entrez:
10
8
2021
Statut:
ppublish
Résumé
Experimental Haemonchus contortus (Hc) infections revealed that Texel sheep have faecal egg counts (FEC) comparable to parasite-resistant St. Croix but adult worm burden comparable to parasite-susceptible Suffolk sheep. The aim of these studies was to further investigate the mechanism causing this disparity. Cellular and humoral immune responses to adult- and egg stage Hc were compared amongst St. Croix, Texel and Suffolk sheep. Adult worms and eggs were exposed to peripheral blood mononuclear cells (PBMC) and serum from the three breeds in vitro. There was a greater IgA binding to eggs when treated with St. Croix and Texel serum (p < .05), and these eggs exhibited a lower hatch rate (p < .05) when exposed to serum and PBMC. Adult worms exposed to St. Croix and Texel-derived PBMC, and serum had greater binding around the head and reproductive structures than worms exposed to Suffolk-derived cells and serum. Consequently, egg release tended to be affected by breed (p = .09). To further examine differences, Suffolk and Texel lambs (n = 5/breed) were infected with 10,000 Hc L3 for 30 days. Suffolk sheep had greater egg release per worm than Texel (3.8 vs. 2.1 eggs/worm). Taken together, these data would indicate one of the mechanisms in Texel's targeting adult-stage Hc reducing worm fecundity.
Types de publication
Journal Article
Research Support, Non-U.S. Gov't
Research Support, U.S. Gov't, Non-P.H.S.
Langues
eng
Sous-ensembles de citation
IM
Pagination
e12876Informations de copyright
© 2021 John Wiley & Sons Ltd.
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