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Protective efficacy of pVAX-RON5p against acute and chronic infections of Toxoplasma gondii in BALB/c mice

Zhao, Y.; Li, Z.-Y.; Chen, J.; Sun, X.-L.; Liu, S.-S.; Zhu, X.-Q.; Zhou, D.-H.

Experimental Parasitology 163: 24-30

2016

ISSN/ISBN: 1090-2449
PMID: 26821295
DOI: 10.1016/j.exppara.2016.01.011
Accession: 058650395
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Toxoplasma gondii can infect all the warm-blooded animals and humans and causes serious diseases especially in immuno-compromised patients and pregnant women. Rhoptry neck proteins (RONs) play an important role in the formation of moving junction, which mediates the invasion of this parasite. A recombinant plasmid pVAX-RON5p, which can express part of RON5 protein in the eukaryocyte, was generated and used to immune BALB/c mice for evaluating the protective efficacy against the acute and chronic infections of T. gondii. Both humoral and cellular immune responses were evoked in mice by pVAX-RON5p immunization, and a slightly prolonged survival period was detected in the immunized group (7.6 ± 3.31 days) compared to the blank control (4.9 ± 0.32 days) after acute T. gondii infection (P < 0.05). For chronic infection of T. gondii, the number of cysts in the brain of pVAX-RON5p-immunized mice decreased 25.8% compared to blank control (P < 0.05). Our data suggested that RON5p DNA vaccine can induce partial protective immunity against acute and chronic T. gondii infections.

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