BmTI antigens induce a bovine protective immune response against Boophilus microplus tick
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2002-03-01
Autores
Andreotti, R.
Gomes, A.
Malavazi-Piza, K. C.
Sasaki, S. D.
Sampaio, CAM
Tanaka, A. S.
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Boophilus microplus trypsin inhibitors (BmTIs) present in larvae were preliminarily characterized as active proteins, approximately 10-18 kDa, by SDS-PAGE. BmTIs showed trypsin inhibitory activity on reverse zymography containing gelatin (0.03%) and also inhibited others serine proteinases (human neutrophil elastase and human plasma kallikrein). Bos indicus, Nelore breed calves, previously sensitized with BmTIs and challenged with tick larvae (20,000 larvae/animal), showed 72.8% efficacy to interfere in tick development with 69.7% and 71.3% reduction of both tick number and egg weight, respectively. Cattle BmTIs antiserum titer was approximately 1:8000. the maximum level of BmTIs antibody production was detected 40 days after the first immunization by ELISA. Our preliminary results suggest that B. microplus serine proteinase inhibitors may play a role in the tick larvae fixation and feeding processes. Therefore, the development of antibodies against BmTIs might impair the normal parasitism. (C) 2002 Elsevier Science B.V. All rights reserved.
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International Immunopharmacology. Amsterdam: Elsevier B.V., v. 2, n. 4, p. 557-563, 2002.