Taenia crassiceps cysticercosis: humoral immune response and protection elicited by DNA immunization.
The purpose of this study was to evaluate DNA vaccination in cysticercosis prevention by using a Taenia crassiceps cDNA of a recombinant antigen (KETc7) that has been reported as protective against murine cysticercosis. The KETc7 cDNA was cloned into the pcDNA3 plasmid alone or with the betaglycan signal peptide sequence (pTc-7 and pTc-sp7, respectively). Positive expression of the pTc-sp7 product was confirmed by transfection of C33 cells and immunofluorescence using sera of mice infected with T. crassiceps. Immunization of mice with 3 injections of pTc-sp7 DNA at the higher dose (200 microg) was the most effective to induce antibody with or without bupivacaine. Immunization with pTc-sp7 induced protection against challenge with T. crassiceps cysticerci as successfully as previously observed with the KETc7 recombinant protein. Antibodies elicited by DNA immunization with pTc-sp7 specifically reacted with the native protein of 56 kDa previously reported, which is immunolocalized in the tegument of T. crassiceps cysticerci. The 56-kDa antigen is also present in Taenia solium oncospheres, cysticerci, and adult tissue. The protection induced in DNA-immunized mice and the observation that the injected plasmid remains as an episomic form within muscle cells, encouraged us to continue testing this procedure to prevent T. solium cysticercosis.[1]References
- Taenia crassiceps cysticercosis: humoral immune response and protection elicited by DNA immunization. Rosas, G., Cruz-Revilla, C., Fragoso, G., López-Casillas, F., Pérez, A., Bonilla, M.A., Rosales, R., Sciutto, E. J. Parasitol. (1998) [Pubmed]
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