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Vaccine. 2017 Dec 15;35(50):7010-7017. doi: 10.1016/j.vaccine.2017.10.054. Epub 2017 Nov 6.

Poly (d,l-lactide-co-glycolide) nanoparticle-entrapped vaccine induces a protective immune response against porcine epidemic diarrhea virus infection in piglets.

Author information

1
Institute of Veterinary Medicine, Jiangsu Academy of Agricultural Sciences, Key Laboratory of Veterinary Biological Engineering and Technology, Ministry of Agriculture, Nanjing 210014, Jiangsu, China. Electronic address: libinana@126.com.
2
Institute of Veterinary Immunology & Engineering, Jiangsu Academy of Agricultural Sciences, Nanjing 210014, Jiangsu, China.
3
Institute of Veterinary Medicine, Jiangsu Academy of Agricultural Sciences, Key Laboratory of Veterinary Biological Engineering and Technology, Ministry of Agriculture, Nanjing 210014, Jiangsu, China.
4
College of Animal Medicine, Agricultural University of Hebei, Baoding 071001, China.
5
Institute of Veterinary Medicine, Jiangsu Academy of Agricultural Sciences, Key Laboratory of Veterinary Biological Engineering and Technology, Ministry of Agriculture, Nanjing 210014, Jiangsu, China. Electronic address: Kongwanghe@126.com.

Abstract

Porcine epidemic diarrhea (PED) causes 80-100% mortality in neonatal piglets, and its causative agent, the porcine epidemic diarrhea virus (PEDV), poses an important threat to the swine industry worldwide. In this study, we prepared biodegradable poly (d,l-lactide-co-glycolide) (PLGA) nanoparticle-entrapped PEDV killed vaccine antigens (KAg) (PLGA-KAg). Late-term pregnant sows were intranasally inoculated with PLGA-KAg, and the mortality resulting from challenge with highly virulent PEDV was investigated in their passively immunized suckling piglets. PEDV-specific IgG and IgA antibody titers were enhanced in pregnant sows immunized with PLGA-KAg relative to the titers in sows inoculated with KAg. Similar results were seen in the passively immunized suckling piglets of these sows. Improved lymphocyte proliferation responses and IFN-γ levels were induced in pregnant sows immunized with PLGA-KAg compared with those vaccinated with KAg or with Montanide™ ISA 201 VG emulsified killed PEDV vaccine (201-KAg). Importantly, there was less piglet mortality in the group vaccinated with PLGA-KAg than in the groups vaccinated with KAg or 201-KAg. These results demonstrate that PLGA-KAg is a promising candidate vaccine that can provide protective immunity against PEDV infection in suckling piglets.

KEYWORDS:

Killed vaccine; PLGA nanoparticle; Porcine epidemic diarrhea virus; Protective immunity

PMID:
29102169
DOI:
10.1016/j.vaccine.2017.10.054
[Indexed for MEDLINE]

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