Stability of the <em>B. abortus</em> S19 vaccine strain with a eukaryotic expression plasmid encoding the G glycoprotein from the rabies virus

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Nidia G. Pazos-Salazar
Juan C. Benitez-Serrano
José L. Calderón-Chamorro
Rigoberto Hernández-Castro
Efrén Díaz-Aparicio
José A. Aguilar-Setién

Abstract

Veterinaria México OA
ISSN: 2448-6760

Cite this as:

  • Pazos-Salazar NG, Benitez-Serrano JC, Calderón-Chamorro JL, Hernández-Castro R, Díaz-Aparicio E, Aguilar-Setién JA. Stability of the B. abortus S19 vaccine strain with a eukaryotic expression plasmid encoding the G glycoprotein from the rabies virus. Veterinaria México OA. 2015;2(2). doi: 10.21753/vmoa.2.2.347.

Brucella abortus S19 is an intracellular vaccine strain against bovine brucellosis. Rabies is a lethal disease in cattle. Plasmids encoding the G glycoprotein from the rabies virus induce a protective immune response in different animal species. A vector called pBBR4-CMV-Ggp-SV40+, which encodes the G gene, regulated by the cytomegalovirus eukaryotic expression promoter, and which can be used to transform the B. abortus S19 vaccine strain, was constructed. The stability of the transformant strain was tested both in vitro and in vivo. In the in vitro assays, B. abortus S19 pBBR4-CMV-Ggp-SV40+ was grown for 5 sequential passages, and for the in vivo assays, female BALB/c mice were infected. Colony-forming unit counting and plasmid identification were performed in each passage and in the spleens at 7 days post-infection. To test the plasmid stability in the strain, all parameters were determined with and without antibiotic. The bacterial concentration was lower with antibiotic than without it, but the bacterial growth was more homogeneous. The plasmid was identified in antibiotic- and non-antibiotic-treated isolated colonies under both in vitro and in vivo conditions. The plasmid construct was also transfected into BHK-21 cells, which express the G glycoprotein. The B. abortus S19 pBBR4-CMV-Ggp-SV40+ strain showed stability, representing a suitable candidate vector for developing a bivalent vaccine against brucellosis and rabies. This is the first time that a Brucella species has been transformed with a eukaryotic expression plasmid.

Figure 1. Plasmid pBBR4-CMV-Ggp-SV40+ construction diagram.
Keywords:
G glycoprotein Rabies virus Brucella abortus S19 CMV promoter

Article Details

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