Abstract
Highly effective and safe prophylactic vaccines are urgently needed to sustainably control schistosomiasis, one of the most serious endemic zoonoses in China. In this study, we characterized adenylate kinase 1 from Schistosoma japonicum (SjAK1), a phosphotransferase that regulates cellular energy and metabolism, and evaluated its potential as a recombinant vaccine. Based on real-time quantitative PCR, western blot, and immunolocalization, SjAK1 is active throughout the life of the worm, although its expression is higher in 21-day-old schistosomula, adult worms, and eggs deposited in the host liver. Further, the enzyme accumulates in the eggshell, intestinal epithelium, integument of adult worms and in the vitellaria tissue in female worms. A 594-bp full-length complementary DNA (cDNA) encoding SjAK1 was synthesized from total RNA of 3-day-old schistosomes, and immunization with recombinant SjAK1 reduced worm burden by 50%, decreased the density of eggs deposited in the host liver by 40%, and reduced the area of granulomas in the host liver by 56%. ELISA results showed that recombinant SjAK1 also stimulated Th1 cytokines such as IL-2 and IFN-γ, but not IL-5 and IL-4. Collectively, a recombinant form of the enzyme SjAK1 elicits partial protective immunity against Schistosoma japonicum infection and the induction of Th1 cytokines. Thus, the enzyme has potential as a component of a multivalent vaccine against schistosomiasis.
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Acknowledgments
We thank Qian Gao and Xiaoxue Ma for the initial contributions to the project. We also thank Prof. Rui Zhou and Feng Li for the assistance and for providing the laboratory facilities. We are grateful to Christoph Grevelding for the advice on article writing.
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This work was funded by the National Natural Science Foundation of China (No. 81273010) and by the Scientific Research Subject of the Health and Family Planning Commission of Hubei Province (No. XF2012-18).
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The authors declare that they have no conflict interest.
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Animal protocols were in strict compliance with the guidelines of the Association for Assessment and Accreditation of Laboratory Animal Care International and were approved by the Institutional Animal Care and Use Committee of Wuhan University (approval no. 2015-0023).
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Gao, Y., Zhou, X., Wang, H. et al. Immunization with recombinant schistosome adenylate kinase 1 partially protects mice against Schistosoma japonicum infection. Parasitol Res 116, 1665–1674 (2017). https://doi.org/10.1007/s00436-017-5441-y
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DOI: https://doi.org/10.1007/s00436-017-5441-y