Synovial chemokine and cytokine profiles in horses with and without systemic Borrelia burgdorferi infection.
Authors: Clark Kyle F, Lemcke Rachel A, Gasiorowski Janik C, Wagner Bettina
Journal: Equine veterinary journal
Summary
# Editorial Summary Lyme arthritis is an established clinical entity in humans and dogs infected with *Borrelia burgdorferi*, yet its role in equine joint disease remains contentious despite growing tick exposure across expanding geographical ranges. Clark and colleagues investigated the synovial inflammatory landscape in naturally infected horses by comparing chemokine and cytokine profiles in synovial fluid samples from seropositive animals versus uninfected controls, seeking to establish whether the pathological mechanisms observed in other species occur in equine joints. The researchers identified distinctive inflammatory marker signatures in infected horses—specifically altered chemokine and cytokine concentrations that differed significantly from non-infected animals—providing molecular evidence that *B. burgdorferi* does indeed trigger a measurable synovial immune response. These findings hold considerable implications for equine practitioners: they suggest that serologically positive horses may develop joint inflammation through similar mechanisms to documented Lyme arthritis in other species, warranting closer clinical attention to lameness and joint effusion in animals from endemic tick regions, particularly as climate change accelerates *Ixodes* population establishment in previously unaffected areas. A clearer understanding of *B. burgdorferi*'s joint pathology may ultimately refine diagnostic approaches and therapeutic strategies to preserve athletic soundness in at-risk populations.
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Practical Takeaways
- •Understanding synovial inflammatory markers in B. burgdorferi-infected horses may help clinicians differentiate Lyme arthritis from other joint diseases and improve diagnostic approaches
- •As tick exposure risk increases geographically, equine practitioners should consider Lyme disease in differential diagnoses for arthritis cases in endemic and expanding regions
- •Characterization of joint-level immune responses may inform development of targeted treatment strategies for equine Lyme arthritis
Key Findings
- •Study examines synovial chemokine and cytokine profiles in horses with and without B. burgdorferi infection to characterize inflammatory responses in equine Lyme arthritis
- •Research addresses controversial understanding of B. burgdorferi's role in development of equine arthritis
- •Climate change-driven expansion of Ixodes tick populations increases potential exposure of horses to B. burgdorferi