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- Title
Development of a Streptococcus gordonii vaccine strain expressing Schistosoma japonicum Sj-F1 and evaluation of using this strain for intranasal immunization in mice.
- Authors
Wang, Linqian; Liu, Wei; Yang, Ming; Peng, Dan; Chen, Liyu
- Abstract
Schistosomiasis is a worldwide parasitic disease. Currently, chemotherapy is the main effective method to treat schistosomiasis; however, it does not prevent reinfection. No effective vaccine is currently available to prevent schistosomiasis. Sj-F1 (GenBank accession number AY261995) is a novel gene that was discovered through screening adult Schistosoma japonicum worm cDNA library with female S. japonicum antigen-immunized sera. Streptococcus gordonii, a normal inhabitant of the human oral cavity, has been a prime candidate in recent investigations toward developing a live oral vaccine vector. One of the approaches for the surface expression of heterologous antigens in S. gordonii is to surface-localize them with the M6 protein from Streptococcus pyogenes. Here, we develop a recombinant S. gordonii strain that expresses the M6-Sj-F1 fusion protein on the bacterial surface. Intranasal immunization in mice with such M6-Sj-F1-expressing S. gordonii bacteria induced strong serum IgG, serum IgA, and saliva IgA against Sj-F1. The results of protective immunity against a challenge with cercariae of S. japonicum showed statistically significant protection following this treatment, with a worm reduction rate of 21.45 % and an egg reduction rate of 34.77 %. Our data indicate that the described M6-Sj-F1-expressing S. gordonii is highly immunogenic and can partially protect mice from challenge infection with S. japonicum. Intranasal immunization with recombinant S. gordonii may be an alternative to developing a novel S. japonicum vaccine in a safe, effective, and feasible way.
- Subjects
SCHISTOSOMIASIS; PARASITIC diseases; SCHISTOSOMA japonicum; ANTISENSE DNA; STREPTOCOCCUS gordonii; ORAL vaccines
- Publication
Parasitology Research, 2013, Vol 112, Issue 4, p1701
- ISSN
0932-0113
- Publication type
Article
- DOI
10.1007/s00436-013-3327-1