Document Detail

Bovine resistance to Amblyomma americanum ticks: an acquired immune response characterized by cutaneous basophil infiltrates.
MedLine Citation:
PMID:  6543047     Owner:  NLM     Status:  MEDLINE    
Purebred Holstein calves acquired resistance to Amblyomma americanum adult ticks after 1 infestation and expressed resistance during a challenge infestation 26 days later. Tick yields from resistant animals were normal, but mean tick weight and egg-mass weight were reduced significantly (31 and 32%, respectively). Cutaneous cellular responses at tick feeding sites in primary (naive) hosts consisted almost exclusively of mononuclear cells, until 24-h post-infestation when granulocytes appeared. At 48 h, basophils were the most abundant granulocyte and comprised 19% of the total cellular response. Secondary and tertiary hosts expressed significant cutaneous basophil responses as early as 6 h post-tick infestation, indicative of an anamnestic response. Cutaneous basophil levels in tertiary hosts (16-34% of the infiltrate) were increased by 2-fold over secondary hosts (12-16% of the infiltrate). Neutrophils and eosinophils were fairly abundant in secondary hosts (22-33%, and 3-13%, respectively), but decreased significantly in tertiary hosts corresponding to increased basophil levels. Mast cells comprised less than 10% of the cells found in primary hosts, and less than 5% in secondary and tertiary hosts representing a consistent, but insignificant component of the total cells. Basophils were not observed in the blood of hosts during any tick infestation, but a peripheral blood basophilia (0.1-1.1%) marked the end of each tick feeding period. A neutropenia was observed in the blood of tertiary hosts corresponding to a decreased tissue neutrophil response. Blood eosinophil, lymphocyte and monocyte levels remained unchanged during each tick infestation compared to controls. In summary, calves acquired immunity to A. americanum ticks, resulting in significant decreases in feeding and ovipositional success associated with a local cutaneous basophil response and peripheral blood basophilia. These findings suggest that basophils are involved in bovine immunity to ticks as has been established in the guinea pig model.
S J Brown; R W Barker; P W Askenase
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't; Research Support, U.S. Gov't, P.H.S.    
Journal Detail:
Title:  Veterinary parasitology     Volume:  16     ISSN:  0304-4017     ISO Abbreviation:  Vet. Parasitol.     Publication Date:  1984 Oct 
Date Detail:
Created Date:  1985-03-20     Completed Date:  1985-03-20     Revised Date:  2007-11-14    
Medline Journal Info:
Nlm Unique ID:  7602745     Medline TA:  Vet Parasitol     Country:  NETHERLANDS    
Other Details:
Languages:  eng     Pagination:  147-65     Citation Subset:  IM    
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MeSH Terms
Basophils / cytology
Behavior, Animal
Cattle Diseases / immunology*,  pathology
Feeding Behavior
Skin / pathology
Species Specificity
Tick Infestations / immunology,  pathology,  veterinary*
Ticks / physiology*
Grant Support

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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