Protection of pigs against Taenia solium cysticercosis using recombinant antigen or in combination with DNA vaccine.
In the present study, we investigated the duration of protection afforded to pigs immunized in two different prime-boost regimens: one is homologus priming and boosting with a protein vaccine, and the other is priming with a DNA vaccine and boosting with the protein vaccine. Groups of pigs that received the same vaccination regimen were then challenged with Taenia solium eggs at 6, 12 or 20 weeks post-immunization (wpi), respectively. The results showed that all vaccinated pigs challenged at 6 or 12 wpi showed significant (P < 0.05) reduction in the development of cysts. When challenged at 20 wpi, pigs primed with the DNA vaccine (pcDNA3-cC1) followed by two boosters of the protein vaccine (GST-cC1) showed significant (P < 0.05) protection against the challenge of T. solium eggs, whereas pigs receiving three injections of the protein vaccine showed no significant protection compared to non-vaccinated controls (P > 0.05). Antibody isotype assays showed that DNA prime-protein boost regimen induced a predominantly IgG2 response, compared to an IgG1 biased response for the protein prime-protein boost regimen. In addition, peripheral blood mononuclear cells (PBMC) obtained from the DNA prime-protein boost group proliferated strongly in response to GST-cC1 protein, and this responsiveness persisted until 20 wpi. Taken together, our data suggest that the use of a prime-boost strategy combining DNA and protein vaccines may be better than protein alone for the longevity of protection against the challenge of T. solium eggs.
Guo
Ying-Jun
YJ
Department of Medical Genetics, The Second Military Medical University, Shanghai 200433, China.
Sun
Shu-Han
SH
Zhang
Yi
Y
Chen
Zhu-Huan
ZH
Wang
Kai-Yu
KY
Huang
Li
L
Zhang
Shu
S
Zhang
Hong-Ying
HY
Wang
Qing-Min
QM
Wu
Dan
D
Zhu
Wei-Jia
WJ
D000818:Animals; D000909:Antibodies, Helminth / Q000097:blood*; D000947:Antigens, Helminth / Q000276:immunology*; D003551:Cysticercosis / Q000517:prevention & control / Q000662:veterinary*; D015801:Helminth Proteins / Q000008:administration & dosage / Q000276:immunology; D007117:Immunization, Secondary; D007074:Immunoglobulin G / Q000097:blood; D008213:Lymphocyte Activation; D011994:Recombinant Proteins / Q000008:administration & dosage / Q000276:immunology; D013552:Swine / Q000276:immunology / Q000469:parasitology; D013553:Swine Diseases / Q000517:prevention & control*; D041201:Taenia solium / Q000276:immunology*; D013997:Time Factors; D014611:Vaccination / Q000662:veterinary; D019444:Vaccines, DNA / Q000008:administration & dosage / Q000276:immunology*; D014614:Vaccines, Synthetic / Q000008:administration & dosage / Q000276:immunology*
D000909:Antibodies, Helminth; D000947:Antigens, Helminth; D015801:Helminth Proteins; D007074:Immunoglobulin G; D011994:Recombinant Proteins; D019444:Vaccines, DNA; D014614:Vaccines, Synthetic