Vaccination with alum-precipitated recombinant Ancylostoma-secreted protein 1 protects mice against challenge infections with infective hookworm (Ancylostoma caninum) larvae

The Journal of Infectious Diseases
Kashinath GhoshPeter J Hotez

Abstract

Ancylostoma-secreted protein 1 (ASP-1) is the major protein secreted by infective hookworm larvae (Ancylostoma caninum). The Escherichia coli-expressed recombinant protein was evaluated as a vaccine antigen in a mouse model of ancylostomiasis. A. caninum larvae migrate through mouse lungs, with maximal migration occurring 48-54 h after oral infection. Quantitative larval recovery from the lungs at this time was used as an end point for vaccine evaluation. All mice developed antibodies to recombinant ASP-1 (rASP-1) after immunization and boosting with the alum-precipitated protein. The immunized mice had their worm burden reduced 79% (P < .0001) compared with controls. Immunization with rASP-1 in the presence of Corynebacterium parvum adjuvant also showed a vaccine effect (63% protection; P < .0001). The possibility that this protective effect resulted from delayed larval lung entry was excluded. rASP-1 offers promise as a hookworm vaccine antigen.

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