Oral vaccination with Trichinella spiralis DNase II DNA vaccine delivered by attenuated Salmonella induces a protective immunity in BALB/c mice.

Abstract

Trichinellosis is one of the most serious foodborne parasitic zoonosis with worldwide distribution, and it is necessary to develop a vaccine to interrupt transmission from animals to humans. Trichinella spiralis adult-specific DNase II-1 (TsDNase II) were identified by immunoproteomics in surface or excretory/secretory proteins of adult worms (AW) and intestinal infective larvae (IIL). The aim of this study was to investigate the systemic, mucosal responses and immune protection elicited by oral vaccination with TsDNase II DNA vaccine delivered by attenuated Salmonella typhimurium strain⊿cyaSL1344. Oral vaccination with TsDNase II DNA vaccine triggered an obvious mucosal sIgA response and a systemic IgG response in mice, and IgG1 was predominant. Th1 (IFN-γ) and Th2 (IL-4, 10) cytokines were distinctly increased in the spleen and mesenteric lymph node (MLN) cells of vaccinated mice. An indirect immunofluorescent test revealed that native TsDNase II is present at the cuticle of this nematode after the 2nd molting, further confirming that TsDNase II is adult-specific and expressed at AW and pre-adult stages. Oral immunization of mice with TsDNase II exhibited a 53.85% reduction in AW and a 59.26% reduction in ML after larval challenge. The in vitro NBL production of adult females from TsDNase II-vaccinated mice was also reduced in comparison with pcDNA3.1 or the PBS control group (P < 0.01). Our results show that oral immunization of mice with TsDNase II produced an intestinal and systematic concurrent Th1/Th2 immune response, and a significant immune protection against challenge.

• Authors: Xin Qi, Yue Han, Peng Jiang, Xin Yue, Hua Nan Ren, Ge Ge Sun, Shao Rong Long, Chuan Yu, Xiang Chao Cheng, Jing Cui, Zhong Quan Wang
• Journal: Veterinary research (Vet Res) Vol. 49 Issue 1 Pg. 119 (Dec 05 2018) ISSN: 1297-9716 [Electronic] England
• PMID: 30518422 (Publication Type: Journal Article)

Chemical References

• Helminth Proteins
• Vaccines, Attenuated
• Vaccines, DNA
• Endodeoxyribonucleases
• deoxyribonuclease II

Topics

• Administration, Oral
• Animals
• Endodeoxyribonucleases (therapeutic use)
• Female
• Helminth Proteins (therapeutic use)
• Immunity, Mucosal
• Mice
• Mice, Inbred BALB C
• Plasmids
• Salmonella typhimurium (genetics)
• Trichinella spiralis (immunology)
• Trichinellosis (prevention & control)
• Vaccination
• Vaccines, Attenuated (immunology)
• Vaccines, DNA (immunology)