Protective immunity againstIxodes ricinusinduced by a salivary serpin

Iris is a specific elastase inhibitor expressed in the salivary glands of the hard tickIxodes ricinus. It belongs to the superfamily of serpins and interferes with both haemostasis and the immune response of the host. In this study, we first show that Iris is expressed in nymphs but not in the femal...

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Bibliographic Details
Published in:Vaccine 2007-04, Vol.25 (17), p.3284
Main Authors: Prevot, P-P, Couvreur, B, Denis, V, Brossard, M, van hamme, L, Godfroid, E
Format: Article
Language:English
Subjects:
Animals
Arachnids
Cattle
Females
Lyme disease
Mortality
Proteins
Reptiles & amphibians
Vaccines
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Summary:Iris is a specific elastase inhibitor expressed in the salivary glands of the hard tickIxodes ricinus. It belongs to the superfamily of serpins and interferes with both haemostasis and the immune response of the host. In this study, we first show that Iris is expressed in nymphs but not in the female midgut nor in males. We also show that Iris is present in the saliva. To examine its potency as anti-tick vaccine candidate, we set up three models ofI. ricinusinfestation on immunized animals: nymphs on mice, and adults and nymphs on rabbits. We report the rise of neutralizing antibodies following immunization of rabbits and mice. This comes with a significant protective immunity against ticks in rabbits only, resulting in a 30% mortality rate and a diminution of weight gain in both nymphs and adults and a prolongation of blood feeding time in adults. This is the first report on an anti-tick vaccine trial onI. ricinususing a protein able to interact with both host immunity and haemostasis, as a vaccinating antigen.
ISSN:0264-410X
1873-2518
DOI:10.1016/j.vaccine.2007.01.008