Parasitology Research

, Volume 110, Issue 2, pp 775–786

Cloning, expression, and characterization of Schistosoma japonicum tegument protein phosphodiesterase-5

  • Min Zhang
  • Yanhui Han
  • Zhu Zhu
  • Dong Li
  • Yang Hong
  • Xiujuan Wu
  • Zhiqiang Fu
  • Jiaojiao Lin
Original Paper

DOI: 10.1007/s00436-011-2552-8

Cite this article as:
Zhang, M., Han, Y., Zhu, Z. et al. Parasitol Res (2012) 110: 775. doi:10.1007/s00436-011-2552-8

Abstract

The tegument proteins of schistosomes are regarded as potential vaccine candidates and drug targets to control schistosomiasis. Nucleotide pyrophosphatase/phosphodiesterase-5 (NPP-5), which belongs to a multigene family of nucleotide pyrophosphatase/phosphodiesterases (NPPs), is important in the hydrolysis of pyrophosphate or phosphodiester bonds in nucleotides and their derivatives. In the present study, SjNPP-5, identified as one of the tegument proteins of Schistosoma japonicum in our previous proteomic studies, was cloned on a fragment of 1,371 bp and expressed as a recombinant protein of 69 kDa. Real-time RT-PCR analysis showed that SjNPP-5 was up-regulated at 21–42 days, and the expression level in 42-day-old male worms was almost nine times higher than that in females. Western blot analysis revealed that rSjNPP-5 had good antigenicity. Immunofluorescence analysis found that SjNPP-5 was a membrane-associated antigen mainly distributed on the surface of the male adult worm of S. japonicum. BALB/c mice vaccinated with rSjNPP-5 three times showed a 29.90% worm reduction (P < 0.05) and a 26.21% egg count reduction (P > 0.05). Immunization with rSjNPP-5 induced a mixed Th1/Th2 response in which Th1 was dominant. The response was characterized by a reduced IgG1/IgG2a ratio and elevated production of cytokines IFN-γ and IL-4. This study suggested that SjNPP-5 may be important in schistosome development, and further investigations are required to fully understand the function of this molecule.

Copyright information

© Springer-Verlag 2011

Authors and Affiliations

  • Min Zhang
    • 1
  • Yanhui Han
    • 1
  • Zhu Zhu
    • 1
  • Dong Li
    • 1
  • Yang Hong
    • 1
  • Xiujuan Wu
    • 1
  • Zhiqiang Fu
    • 1
  • Jiaojiao Lin
    • 1
  1. 1.Shanghai Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Key Laboratory of Animal ParasitologyMinistry of AgricultureShanghaiPeople’s Republic of China
  2. 2.Key Laboratory of Animal Parasitology, Ministry of AgricultureChinese Academy of Agricultural SciencesShanghaiPeople’s Republic of China