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Evaluation of Different DNA Vaccines against Porcine Reproductive and Respiratory Syndrome (PRRS) in Pigs.

Petrini S, Ramadori G, Villa R, Borghetti P, de Angelis E, Cantoni AM, Corradi A, Amici A, Ferrari M - Vaccines (Basel) (2013)

Bottom Line: Only vaccines A and B were able to reduce the clinical signs of the infection.Neutralizing antibody were detected Post Challenge Days 61 (PCD) in all groups.In the other groups, the IFN-g were detected after challenge infection.

View Article: PubMed Central - PubMed

Affiliation: Umbria and Marche Experimental Zooprophylaxis Institute, via Gaetano Salvemini 1, Perugia 06126, Italy. s.petrini@izsum.it.

ABSTRACT
In veterinary medicine, there have been different experiences with the plasmid DNA vaccination. In this area and with the hypothesis to demonstrate the effectiveness of different plasmids encoding porcine respiratory and reproductive syndrome (PRRS), five DNA vaccines against PRRS were evaluated for their innocuity and efficacy in pigs. Eighteen animals were divided into five groups which were injected with five (A, B, C, D, E) different DNA vaccines. Albeit, none of the proposed vaccines were able to protect the animals against PRRS virus. Only vaccines A and B were able to reduce the clinical signs of the infection. ELISA IgM were detected 30 days after the first vaccination in the pigs injected by Vaccine A or B. ELISA IgG were detected 90 days after the first vaccination in the pigs injected by Vaccine B or C. Neutralizing antibody were detected Post Challenge Days 61 (PCD) in all groups. In the pigs inoculated with Vaccine C, IFN-g were detected 90 days after first vaccination, and after challenge exposure they increased. In the other groups, the IFN-g were detected after challenge infection. Pigs injected with each of the vaccines A, B, C, D and E showed a significantly higher level of CD4(-)CD8⁺ lymphocytes (p < 0.001) after infection in comparison with their controls.

No MeSH data available.


Related in: MedlinePlus

Schematic genome of porcine reproductive and respiratory syndrome virus (PRRSV) composed of 10 open reading frames (ORFs) encoding the different functional and structural proteins. In particular, ORF4 and ORF5 are used in the plasmid encoding GP4 or GP5 proteins.
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vaccines-01-00463-f001: Schematic genome of porcine reproductive and respiratory syndrome virus (PRRSV) composed of 10 open reading frames (ORFs) encoding the different functional and structural proteins. In particular, ORF4 and ORF5 are used in the plasmid encoding GP4 or GP5 proteins.

Mentions: The causative agent of PRRS is an enveloped virus which belongs to Arteriviridae family [1]. This virus contains a linear, single-stranded RNA (+) genome of 15 kb composed of 10 open reading frames (ORFs-ORF1a, ORF1b, ORF2a, ORF2b, ORF3, ORF4, ORF5a, ORF5b, ORF6, ORF7) encoding the different functional and structural viral proteins (Figure 1). In particular, the principal non-structural proteins, encoded by ORFs 1a and 1b, have replicase and helicase activities, whereas the three major structural proteins GP5, M, and N are encoded by ORFs 5, 6, and 7, respectively. The products of ORFs 2, 3, and 4 (GP2, GP3 and GP4) represent additional components of the PRRS virion. GP4 contains an immunodominant, neutralizing epitope that shows an extensive degree of variation. This fact indicates that it does not play a direct role in cell-entry or fusion processes, but that it is most probably located in close proximity to that region. Costers et al. indicates that accumulation of amino acids (aa) substitutions in the GP4 neutralizing epitope play a role in the inefficient PRRSV elimination from pigs with a primed anti-PRRSV neutralizing antibody response at the onset of infection [2].


Evaluation of Different DNA Vaccines against Porcine Reproductive and Respiratory Syndrome (PRRS) in Pigs.

Petrini S, Ramadori G, Villa R, Borghetti P, de Angelis E, Cantoni AM, Corradi A, Amici A, Ferrari M - Vaccines (Basel) (2013)

Schematic genome of porcine reproductive and respiratory syndrome virus (PRRSV) composed of 10 open reading frames (ORFs) encoding the different functional and structural proteins. In particular, ORF4 and ORF5 are used in the plasmid encoding GP4 or GP5 proteins.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4494207&req=5

vaccines-01-00463-f001: Schematic genome of porcine reproductive and respiratory syndrome virus (PRRSV) composed of 10 open reading frames (ORFs) encoding the different functional and structural proteins. In particular, ORF4 and ORF5 are used in the plasmid encoding GP4 or GP5 proteins.
Mentions: The causative agent of PRRS is an enveloped virus which belongs to Arteriviridae family [1]. This virus contains a linear, single-stranded RNA (+) genome of 15 kb composed of 10 open reading frames (ORFs-ORF1a, ORF1b, ORF2a, ORF2b, ORF3, ORF4, ORF5a, ORF5b, ORF6, ORF7) encoding the different functional and structural viral proteins (Figure 1). In particular, the principal non-structural proteins, encoded by ORFs 1a and 1b, have replicase and helicase activities, whereas the three major structural proteins GP5, M, and N are encoded by ORFs 5, 6, and 7, respectively. The products of ORFs 2, 3, and 4 (GP2, GP3 and GP4) represent additional components of the PRRS virion. GP4 contains an immunodominant, neutralizing epitope that shows an extensive degree of variation. This fact indicates that it does not play a direct role in cell-entry or fusion processes, but that it is most probably located in close proximity to that region. Costers et al. indicates that accumulation of amino acids (aa) substitutions in the GP4 neutralizing epitope play a role in the inefficient PRRSV elimination from pigs with a primed anti-PRRSV neutralizing antibody response at the onset of infection [2].

Bottom Line: Only vaccines A and B were able to reduce the clinical signs of the infection.Neutralizing antibody were detected Post Challenge Days 61 (PCD) in all groups.In the other groups, the IFN-g were detected after challenge infection.

View Article: PubMed Central - PubMed

Affiliation: Umbria and Marche Experimental Zooprophylaxis Institute, via Gaetano Salvemini 1, Perugia 06126, Italy. s.petrini@izsum.it.

ABSTRACT
In veterinary medicine, there have been different experiences with the plasmid DNA vaccination. In this area and with the hypothesis to demonstrate the effectiveness of different plasmids encoding porcine respiratory and reproductive syndrome (PRRS), five DNA vaccines against PRRS were evaluated for their innocuity and efficacy in pigs. Eighteen animals were divided into five groups which were injected with five (A, B, C, D, E) different DNA vaccines. Albeit, none of the proposed vaccines were able to protect the animals against PRRS virus. Only vaccines A and B were able to reduce the clinical signs of the infection. ELISA IgM were detected 30 days after the first vaccination in the pigs injected by Vaccine A or B. ELISA IgG were detected 90 days after the first vaccination in the pigs injected by Vaccine B or C. Neutralizing antibody were detected Post Challenge Days 61 (PCD) in all groups. In the pigs inoculated with Vaccine C, IFN-g were detected 90 days after first vaccination, and after challenge exposure they increased. In the other groups, the IFN-g were detected after challenge infection. Pigs injected with each of the vaccines A, B, C, D and E showed a significantly higher level of CD4(-)CD8⁺ lymphocytes (p < 0.001) after infection in comparison with their controls.

No MeSH data available.


Related in: MedlinePlus