Experimental induction of pulmonary fibrosis in horses with the gammaherpesvirus equine herpesvirus 5.
Abstract: Gammaherpesviruses (γHV) are implicated in the pathogenesis of pulmonary fibrosis in humans and murine models of lung fibrosis, however there is little direct experimental evidence that such viruses induce lung fibrosis in the natural host. The equine γHV EHV 5 is associated with equine multinodular pulmonary fibrosis (EMPF), a progressive fibrosing lung disease in its natural host, the horse. Experimental reproduction of EMPF has not been attempted to date. We hypothesized that inoculation of EHV 5 isolated from cases of EMPF into the lungs of clinically normal horses would induce lung fibrosis similar to EMPF. Neutralizing antibody titers were measured in the horses before and after inoculation with EHV 5. PCR and virus isolation was used to detect EHV 5 in antemortem blood and BAL samples, and in tissues collected postmortem. Nodular pulmonary fibrosis and induction of myofibroblasts occurred in EHV 5 inoculated horses. Mean lung collagen in EHV 5 inoculated horses (80 µg/mg) was significantly increased compared to control horses (26 µg/mg) (p < 0.5), as was interstitial collagen (32.6% ± 1.2% vs 23% ± 1.4%) (mean ± SEM; p < 0.001). Virus was difficult to detect in infected horses throughout the experiment, although EHV 5 antigen was detected in the lung by immunohistochemistry. We conclude that the γHV EHV 5 can induce lung fibrosis in the horse, and hypothesize that induction of fibrosis occurs while the virus is latent within the lung. This is the first example of a γHV inducing lung fibrosis in the natural host.
Publication Date: 2013-10-11 PubMed ID: 24147074PubMed Central: PMC3795644DOI: 10.1371/journal.pone.0077754Google Scholar: Lookup
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- Journal Article
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Summary
This research summary has been generated with artificial intelligence and may contain errors and omissions. Refer to the original study to confirm details provided. Submit correction.
This study shows that equine herpesvirus 5 (EHV 5), a type of gammaherpesvirus, can induce lung fibrosis, a lung disease, in horses when directly inoculated into their lungs. This provides the first concrete evidence that gammaherpesviruses can cause lung fibrosis in their natural host.
Objective of the Research
- The main aim of this research was to experimentally demonstrate whether the equine gammaherpesvirus (γHV), known as equine herpesvirus 5 (EHV 5), can cause lung fibrosis or equine multinodular pulmonary fibrosis (EMPF), a progressive fibrosing lung disease, in its natural host, the horse.
Research Methodology
- The researchers inoculated EHV 5 isolated from horses already affected with EMPF into the lungs of clinically healthy horses.
- Before and after the inoculation, they measured neutralizing antibody titers in the horses in order to monitor immune system responses.
- PCR and virus isolation techniques were used to detect EHV 5 in blood samples taken during the horse’s life, as well as in lung tissue samples collected after euthanasia.
Research Findings
- The experiment demonstrated that nodular pulmonary fibrosis and induction of myofibroblasts occurred in horses after inoculating them with EHV 5.
- The mean lung collagen level in the inoculated horses significantly increased compared to the control horses, indicating the presence of fibrosis.
- The percentage of interstitial collagen also significantly increased in the inoculated horses, providing further evidence of induced fibrosis.
- It was difficult to detect the virus in the horses during the experiment, but EHV 5 antigen was identified in lung tissue through immunohistochemistry, hence demonstrating its presence.
Conclusion of the Research
- The study concluded that EHV 5 can induce lung fibrosis in horses, suggesting that fibrosis may occur while the virus is dormant within the lung.
- This research provides the first documented case of a gammaherpesvirus inducing lung fibrosis in its natural host, an important step in understanding the pathogenesis of pulmonary fibrosis.
Cite This Article
APA
Williams KJ, Robinson NE, Lim A, Brandenberger C, Maes R, Behan A, Bolin SR.
(2013).
Experimental induction of pulmonary fibrosis in horses with the gammaherpesvirus equine herpesvirus 5.
PLoS One, 8(10), e77754.
https://doi.org/10.1371/journal.pone.0077754 Publication
Researcher Affiliations
- Department of Pathobiology and Diagnostic Investigation, College of Veterinary Medicine, Michigan State University, East Lansing, Michigan, United States of America.
MeSH Terms
- Animals
- Antibodies, Viral / immunology
- Gammaherpesvirinae / immunology
- Gammaherpesvirinae / pathogenicity
- Horse Diseases / immunology
- Horse Diseases / metabolism
- Horse Diseases / virology
- Horses
- Pulmonary Fibrosis / immunology
- Pulmonary Fibrosis / metabolism
- Pulmonary Fibrosis / virology
Conflict of Interest Statement
This study was funded by Pfizer Animal Health, New York, N.Y. There are no
other declarations to be made related to employment, consultancy, patents, products in development etc. related to this manuscript. The authors' relationship with Pfizer Animal Health does not alter their adherence to all PLOS ONE policies on sharing data and materials.
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