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An Efficient Schistosoma japonicum Bivalent Membrane Protein Antigen DNA Vaccine Against Schistosomiasis in Mice

Na Lei, Feng-Chun Liu, Cui-Ping Ren, Ji-Jia Shen, Miao Liu

Department of Microbiology and Parasitology, Anhui Provincial Laboratory of Microbiology and Parasitology, Anhui Key Laboratory of Zoonoses, Anhui Medical University, Hefei, Anhui, China (mainland)

Med Sci Monit 2019; 25:9319-9326

DOI: 10.12659/MSM.919195

Available online:

Published: 2019-12-07

BACKGROUND: Schistosomiasis is one of the most important infectious parasitic diseases in the world. The most important was to control schistosomiasis is through a combination of medical therapy and immunization. The membrane antigens Tsp2 and 29 from Schistosoma are promising anti-schistosomiasis vaccine candidates.
MATERIAL AND METHODS: In this study, the pcDNA3.1(+)-SjTsp2, pcDNA3.1(+)-Sj29, and pcDNA3.1 (+)-SjTsp2-29 eukaryotic expression vectors were successfully constructed as DNA vaccines, and the protective abilities of these vaccines were evaluated in mice.
RESULTS: The results showed that vaccination with SjTsp2, Sj29, and SjTsp2-29 reduced parasite burden and hepatic pathology compared to the control group, and the protective effect of the bivalent SjTsp2-29 DNA vaccine was better than that of the univalent SjTsp2 or Sj29 DNA vaccines. We also found high levels of IgG, IgG1, and IgG2a against SjTsp2, Sj29, and SjTsp2-29 DNA vaccines, with high expression of IFN-γ and no IL-4 in the mice.
CONCLUSIONS: The double-membrane antigen DNA vaccine SjTsp2-29 elicited protection against Schistosoma infection and might serve as a vaccine candidate.

Keywords: DNA, Schistosoma japonicum, Vaccine Potency