Effects of different anesthetics in the murine model of EHV-1 infection.
Authors: Eöry M L, Zanuzzi C N, Fuentealba N A, Sguazza G H, Gimeno E J, Galosi C M, Barbeito C G
Journal: Veterinary pathology
Summary
# Editorial Summary: Anesthetic Selection in EHV-1 Research Models The murine model is widely used to study equine herpesvirus 1 (EHV-1) infection because it replicates the disease pathology seen in naturally infected horses, particularly the acute respiratory phase critical for adaptive immune development. Eöry and colleagues compared how three anaesthetic agents—ether, ketamine/xylazine, and isoflurane—influenced the early pulmonary immune response in mice experimentally infected with EHV-1, measuring clinical signs, histopathological changes, and cell death and proliferation rates via immunohistochemistry. Ether-anaesthetized animals displayed the most severe clinical signs, whilst qualitative differences in inflammatory cell recruitment emerged across all three groups; notably, ketamine/xylazine produced the highest lung cell death rates, whereas isoflurane resulted in the highest cell proliferation rates, despite comparable infection levels between groups. The findings demonstrate that anaesthetic choice substantially alters the inflammatory and cellular response to EHV-1 infection, independent of viral replication, highlighting a potentially significant confounding variable in experimental design. For equine professionals reviewing EHV-1 research or designing studies using animal models, this work underscores the critical importance of anaesthetic selection when interpreting immunological outcomes and comparing results across different investigations.
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Practical Takeaways
- •When designing experimental studies on EHV-1 infection in mice, anesthetic choice significantly influences immune response measurement and must be carefully selected to avoid confounding results
- •Isoflurane may be preferable to ketamine/xylazine or ether for EHV-1 studies if preservation of early proliferative immune response is the research goal
- •Researchers must standardize anesthetic protocols within studies and acknowledge anesthetic effects as a potential source of experimental variability in published interpretations
Key Findings
- •Ether anesthesia resulted in more severe clinical signs compared to ketamine/xylazine or isoflurane in EHV-1-infected mice
- •Ketamine/xylazine anesthesia produced the highest cell death rates in infected lungs
- •Isoflurane anesthesia demonstrated the highest cell proliferation rates in infected lungs
- •Different anesthetics alter inflammatory cell recruitment and immune response kinetics during acute EHV-1 infection independent of viral load