<abstract xmlns="http://www.w3.org/1999/xhtml">

<sec id="j_jvetres-2022-0043_s_005">
<h3>Introduction</h3>
<p>The single member of the Asfarviridae family is African swine fever virus (ASFV). This double-stranded DNA virus infects wild and farmed swine and loses the pig industry large sums of money. An inner envelope, capsid, and outer envelope are parts of the ASFV particle containing structural proteins playing different roles in the process of infection or host immune defence evasion. When expressed by the baculovirus system, the p22 protein from the inner envelope was found to induce partial protection against a virulent virus strain. This study aimed to express a part of this protein in a different system and evaluate its immunogenicity.</p></sec>
<sec id="j_jvetres-2022-0043_s_006">
<h3>Material and Methods</h3>
<p>We designed two proteins, the extracellular (C terminal) part of the p22 protein (p22Ct) and its fusion with the heat-labile enterotoxin B subunit from <italic>Escherichia coli</italic> (LTB-p22Ct), which is supposed to be a potent enhancer of the immune response. Both proteins were produced in the <italic>E. coli</italic> expression system and subsequently used for mice immunisation to analyse their safety and immunogenicity.</p></sec>
<sec id="j_jvetres-2022-0043_s_007">
<h3>Results</h3>
<p>The protein fused with LTB did not show the expected adjuvant properties and did not prove safe, because abscess formation was observed after immunisation. In contrast, immunisation with the p22Ct protein alone induced a higher antibody titre but caused no adverse symptoms.</p></sec>
<sec id="j_jvetres-2022-0043_s_008">
<h3>Conclusion</h3>
<p>These results show the high potential of the p22Ct region as an immunogenic protein for ASFV serological detection purposes.</p></sec>
</abstract>

Introduction
The single member of the Asfarviridae family is African swine fever virus (ASFV). This double-stranded DNA virus infects wild and farmed swine and loses the pig industry large sums of money. An inner envelope, capsid, and outer envelope are parts of the ASFV particle containing structural proteins playing different roles in the process of infection or host immune defence evasion. When expressed by the baculovirus system, the p22 protein from the inner envelope was found to induce partial protection against a virulent virus strain. This study aimed to express a part of this protein in a different system and evaluate its immunogenicity.

Material and Methods
We designed two proteins, the extracellular (C terminal) part of the p22 protein (p22Ct) and its fusion with the heat-labile enterotoxin B subunit from Escherichia coli (LTB-p22Ct), which is supposed to be a potent enhancer of the immune response. Both proteins were produced in the E. coli expression system and subsequently used for mice immunisation to analyse their safety and immunogenicity.

Results
The protein fused with LTB did not show the expected adjuvant properties and did not prove safe, because abscess formation was observed after immunisation. In contrast, immunisation with the p22Ct protein alone induced a higher antibody titre but caused no adverse symptoms.

Conclusion
These results show the high potential of the p22Ct region as an immunogenic protein for ASFV serological detection purposes.

Examination of immunogenic properties of recombinant antigens based on p22 protein from African swine fever virus

Journal of Veterinary Research

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

Introduction
The single member of the Asfarviridae family is African swine fever virus (ASFV). This double-stranded DNA virus infects wild and farmed swine and...

Examination of immunogenic properties of recombinant antigens based on p22 protein from African swine fever virus

Published Online: Aug 30, 2022

Page range: 297 - 304

Received: May 03, 2022

Accepted: Aug 10, 2022

DOI: https://doi.org/10.2478/jvetres-2022-0043

Keywords
African swine fever virus, heat-labile enterotoxin B subunit, immune response, p22 protein

© 2022 C. Díaz et al. published by Sciendo

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

Examination of immunogenic properties of recombinant antigens based on p22 protein from African swine fever virus

Published Online: Aug 30, 2022

Page range: 297 - 304

Received: May 03, 2022

Accepted: Aug 10, 2022

DOI: https://doi.org/10.2478/jvetres-2022-0043

KeywordsAfrican swine fever virus, heat-labile enterotoxin B subunit, immune response, p22 protein

© 2022 C. Díaz et al. published by Sciendo

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

Keywords
African swine fever virus, heat-labile enterotoxin B subunit, immune response, p22 protein