Journal of Veterinary Science

The Korean Society of Veterinary Science (대한수의학회)
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Construction and immunization with double mutant ΔapxIBD Δpnp forms of Actinobacillus pleuropneumoniae serotypes 1 and 5

  • Dao, Hoai Thu (College of Veterinary Medicine and Institute of Veterinary Science, Kangwon National University) ;
  • Truong, Quang Lam (College of Veterinary Medicine and Institute of Veterinary Science, Kangwon National University) ;
  • Do, Van Tan (College of Veterinary Medicine and Institute of Veterinary Science, Kangwon National University) ;
  • Hahn, Tae-Wook (College of Veterinary Medicine and Institute of Veterinary Science, Kangwon National University)
  • Received : 2019.10.16
  • Accepted : 2019.12.06
  • Published : 2020.03.31
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Abstract

Actinobacillus pleuropneumoniae (APP) causes a form of porcine pleuropneumonia that leads to significant economic losses in the swine industry worldwide. The apxIBD gene is responsible for the secretion of the ApxI and ApxII toxins and the pnp gene is responsible for the adaptation of bacteria to cold temperature and a virulence factor. The apxIBD and pnp genes were deleted successfully from APP serotype 1 and 5 by transconjugation and sucrose counter-selection. The APP1ΔapxIBDΔpnp and APP5ΔapxIBDΔpnp mutants lost hemolytic activity and could not secrete ApxI and ApxII toxins outside the bacteria because both mutants lost the ApxI- and ApxII-secreting proteins by deletion of the apxIBD gene. Besides, the growth of these mutants was defective at low temperatures resulting from the deletion of pnp. The APP1ΔapxIBDΔpnp and APP5ΔapxIBDΔpnp mutants were significantly attenuated compared with wild-type ones. However, mice vaccinated intraperitoneally with APP5ΔapxIBDΔpnp did not provide any protection when challenged with a 10-times 50% lethal dose of virulent homologous (APP5) and heterologous (APP1) bacterial strains, while mice vaccinated with APP1ΔapxIBDΔpnp offered 75% protection against a homologous challenge. The ΔapxIBDΔpnp mutants were significantly attenuated and gave different protection rate against homologous virulent wild-type APP challenging.

Keywords

Acknowledgement

The authors thank Dr. Janine T. Bosse (Section of Paediatrics, Department of Medicine, Imperial College London, London, UK) for generously providing plasmids.

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