Pathogenesis of virulent and attenuated foot-and-mouth disease virus in cattle
Abstract
Background: Understanding the mechanisms of attenuation and virulence of foot-and-mouth disease virus (FMDV) in the natural host species is critical for development of next-generation countermeasures such as live-attenuated vaccines. Functional genomics analyses of FMDV have identified few virulence factors of which the leader proteinase (Lpro) is the most thoroughly investigated. Previous work from our laboratory has characterized host factors in cattle inoculated with virulent FMDV and attenuated mutant strains with transposon insertions within Lpro. Methods: In the current study, the characteristics defining virulence of FMDV in cattle were further investigated by comparing the pathogenesis of a mutant, attenuated strain (FMDV-Mut) to the parental, virulent virus from which the mutant was derived (FMDV-WT). The only difference between the two viruses was an insertion mutation in the inter-AUG region of the leader proteinase of FMDV-Mut. All cattle were infected by simulated-natural, aerosol inoculation. Results: Both viruses were demonstrated to establish primary infection in the nasopharyngeal mucosa with subsequent dissemination to the lungs. Immunomicroscopic localization of FMDV antigens indicated that both viruses infected superficial epithelial cells of the nasopharynx and lungs. The critical differences between the two viruses were a more rapid establishment of infection by FMDV-WT and quantitatively greater virus loads inmore »
- Authors:
-
- US Dept. of Agriculture-ARS, Plum Island Animal Disease Cener, Greenport, NY (United States). Foreign Animal Disease Research Unit
- US Dept. of Agriculture-ARS, Plum Island Animal Disease Cener, Greenport, NY (United States). Foreign Animal Disease Research Unit; Oak Ridge Inst. for Science and Education (ORISE), Oak Ridge, TN (United States). PIADC Research Participation Program
- Publication Date:
- Research Org.:
- Oak Ridge Institute for Science and Education (ORISE), Oak Ridge, TN (United States)
- Sponsoring Org.:
- USDOE; USDA; US Department of Homeland Security (DHS)
- OSTI Identifier:
- 1626912
- Grant/Contract Number:
- SC0014664; 1940-32000-061-00D; HSHQDC-11-X-00189
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Virology Journal
- Additional Journal Information:
- Journal Volume: 14; Journal Issue: 1; Journal ID: ISSN 1743-422X
- Publisher:
- BioMed Central
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 59 BASIC BIOLOGICAL SCIENCES; Virology; Bovine; Cattle; FMD; FMDV; Foot-and-mouth; Pathogenesis; Virulence; Virus
Citation Formats
Arzt, Jonathan, Pacheco, Juan M., Stenfeldt, Carolina, and Rodriguez, Luis L. Pathogenesis of virulent and attenuated foot-and-mouth disease virus in cattle. United States: N. p., 2017.
Web. doi:10.1186/s12985-017-0758-9.
Arzt, Jonathan, Pacheco, Juan M., Stenfeldt, Carolina, & Rodriguez, Luis L. Pathogenesis of virulent and attenuated foot-and-mouth disease virus in cattle. United States. https://doi.org/10.1186/s12985-017-0758-9
Arzt, Jonathan, Pacheco, Juan M., Stenfeldt, Carolina, and Rodriguez, Luis L. Tue .
"Pathogenesis of virulent and attenuated foot-and-mouth disease virus in cattle". United States. https://doi.org/10.1186/s12985-017-0758-9. https://www.osti.gov/servlets/purl/1626912.
@article{osti_1626912,
title = {Pathogenesis of virulent and attenuated foot-and-mouth disease virus in cattle},
author = {Arzt, Jonathan and Pacheco, Juan M. and Stenfeldt, Carolina and Rodriguez, Luis L.},
abstractNote = {Background: Understanding the mechanisms of attenuation and virulence of foot-and-mouth disease virus (FMDV) in the natural host species is critical for development of next-generation countermeasures such as live-attenuated vaccines. Functional genomics analyses of FMDV have identified few virulence factors of which the leader proteinase (Lpro) is the most thoroughly investigated. Previous work from our laboratory has characterized host factors in cattle inoculated with virulent FMDV and attenuated mutant strains with transposon insertions within Lpro. Methods: In the current study, the characteristics defining virulence of FMDV in cattle were further investigated by comparing the pathogenesis of a mutant, attenuated strain (FMDV-Mut) to the parental, virulent virus from which the mutant was derived (FMDV-WT). The only difference between the two viruses was an insertion mutation in the inter-AUG region of the leader proteinase of FMDV-Mut. All cattle were infected by simulated-natural, aerosol inoculation. Results: Both viruses were demonstrated to establish primary infection in the nasopharyngeal mucosa with subsequent dissemination to the lungs. Immunomicroscopic localization of FMDV antigens indicated that both viruses infected superficial epithelial cells of the nasopharynx and lungs. The critical differences between the two viruses were a more rapid establishment of infection by FMDV-WT and quantitatively greater virus loads in secretions and infected tissues compared to FMDV-Mut. The slower replicating FMDV-Mut established a subclinical infection that was limited to respiratory epithelial sites, whereas the faster replication of FMDV-WT facilitated establishment of viremia, systemic dissemination of infection, and clinical disease. Conclusion: The mutant FMDV was capable of achieving all the same early pathogenesis landmarks as FMDV-WT, but was unable to establish systemic infection. The precise mechanism of attenuation remains undetermined; but current data suggests that the impaired replication of the mutant is more responsible for attenuation than differences in host immunological factors. These results complement previous studies by providing data of high-granularity describing tissue-specific tropism of FMDV and by demonstrating microscopic localization of virulent and attenuated clones of the same field-strain FMDV.},
doi = {10.1186/s12985-017-0758-9},
journal = {Virology Journal},
number = 1,
volume = 14,
place = {United States},
year = {Tue May 02 00:00:00 EDT 2017},
month = {Tue May 02 00:00:00 EDT 2017}
}
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