Immunological and protective effects of Bordetella bronchiseptica subunit vaccines based on the recombinant N-terminal domain of dermonecrotic toxin.
Dermonecrotic toxin (DNT) produced by Bordetella bronchiseptica (B. bronchiseptica) can cause clinical turbinate atrophy in swine and induce dermonecrotic lesions in model mice. We know that the N-terminal of DNT molecule contains the receptor-binding domain, which facilitates binding to the target cells. However, we do not know whether this domain has sufficient immunogenicity to resist B. bronchiseptica damage and thereby to develop a subunit vaccine for the swine industry. In this study, we prokaryotically expressed the recombinant N-terminal of DNT from B. bronchiseptica (named DNT-N) and prepared it for the subunit vaccine to evaluate its immunogenicity. Taishan Pinus massoniana pollen polysaccharide (TPPPS), a known immunomodulator, was used as the adjuvant to examine its immune-conditioning effects. At 49 d after inoculation, 10 mice from each group were challenged with B. bronchiseptica, and another 10 mice were intradermally challenged with native DNT, to examine the protection imparted by the vaccines. The immune parameters (T-lymphocyte counts, cytokine secretions, serum antibody titers, and survival rates) and skin lesions were determined. The results showed that pure DNT-N vaccine significantly induced immune responses and had limited ability to resist the B. bronchiseptica and DNT challenge, whereas the mice administered with TPPPS or Freund's incomplete adjuvant vaccine could induce higher levels of the above immune parameters. Remarkably, the DNT-N vaccine combined with TPPPS adjuvant protected the mice effectively to prevent B. bronchiseptica infection. Our findings indicated that DNT-N has potential for development as an effective subunit vaccine to counteract the damage of B. bronchiseptica infection, especially when used conjointly with TPPPS.
College of Animal Science and Technology, Shandong Agricultural University, Taian 271018, Shandong, China.
Chuanwen
C
Wang
College of Animal Science and Technology, Shandong Agricultural University, Taian 271018, Shandong, China.
Liping
L
Liu
College of Animal Science and Technology, Shandong Agricultural University, Taian 271018, Shandong, China.
Zhen
Z
Zhang
College of Animal Science and Technology, Shandong Agricultural University, Taian 271018, Shandong, China.
Zhengui
Z
Yan
College of Animal Science and Technology, Shandong Agricultural University, Taian 271018, Shandong, China.
Cuilian
C
Yu
College of Animal Science and Technology, Shandong Agricultural University, Taian 271018, Shandong, China.
Mingxu
M
Shao
College of Animal Science and Technology, Shandong Agricultural University, Taian 271018, Shandong, China.
Xiaodong
X
Jiang
College of Animal Science and Technology, Shandong Agricultural University, Taian 271018, Shandong, China.
Shanshan
S
Chi
College of Animal Science and Technology, Shandong Agricultural University, Taian 271018, Shandong, China. Electronic address: Weikaisdau@163.com.
Kai
K
Wei
College of Animal Science and Technology, Shandong Agricultural University, Taian 271018, Shandong, China. Electronic address: Zhurl1963@163.com.
Ruiliang
R
Zhu
D000818:Animals; D001284:Atrophy / Q000209:etiology / Q000517:prevention & control*; D001428:Bacterial Vaccines / Q000008:administration & dosage; D001885:Bordetella Infections / Q000150:complications / Q000276:immunology*; D016950:Bordetella bronchiseptica / Q000276:immunology*; D002478:Cells, Cultured; D005260:Female; D051379:Mice; D008807:Mice, Inbred BALB C; D028223:Pinus; D011058:Pollen / Q000276:immunology; D011134:Polysaccharides / Q000276:immunology; D013552:Swine; D011503:Transglutaminases / Q000235:genetics / Q000276:immunology / Q000378:metabolism*; D014420:Turbinates / Q000473:pathology*; D014614:Vaccines, Synthetic / Q000008:administration & dosage; D010566:Virulence Factors, Bordetella / Q000235:genetics / Q000276:immunology / Q000378:metabolism*
D001428:Bacterial Vaccines; D011134:Polysaccharides; D014614:Vaccines, Synthetic; D010566:Virulence Factors, Bordetella; C060969:dermonecrotic toxin, Bordetella; D011503:Transglutaminases
Bordetella bronchiseptica; Dermonecrotic toxin; Polysaccharide; Subunit vaccine