Lipidomic analysis of immune activation in equine leptospirosis and Leptospira-vaccinated horses.
Authors: Wood Paul L, Steinman Margaret, Erol Erdal, Carter Craig, Christmann Undine, Verma Ashutosh
Journal: PloS one
Summary
# Editorial Summary: Lipidomic profiling in equine leptospirosis and vaccination Distinguishing between horses infected with Leptospira and those protected by vaccination remains a diagnostic challenge, as current serology cannot differentiate infection-induced from vaccine-induced antibodies. Researchers used high-resolution mass spectrometry to analyse serum lipid profiles in naturally infected horses and vaccinated animals, reasoning that the immune response to genuine infection versus bacterin vaccination would generate distinct lipid signatures. Cyclic phosphatidic acids, diacylglycerols, and oxidised choline plasmalogens were elevated in both groups, but triacylglycerols were uniquely raised only in infected horses, whilst sphingomyelins increased selectively in vaccinated animals. These findings suggest that serum lipidomic analysis could potentially provide an objective, infection-specific diagnostic marker to complement existing antibody-based tests and resolve diagnostic uncertainty in vaccination programmes. For practitioners managing leptospirosis risk in equine populations, this novel approach warrants further development as a tool to distinguish vaccinated from genuinely infected animals—a capability particularly valuable for disease surveillance, therapeutic decision-making, and epidemiological tracking.
Read the full abstract on PubMed
Practical Takeaways
- •A lipidomic test could potentially distinguish between horses infected with Leptospira and those responding to vaccination, which current diagnostic assays cannot do
- •This foundational research opens the door to developing better diagnostic tools for leptospirosis, though clinical application is not yet available
- •These findings highlight the different immune responses triggered by vaccination versus natural infection at the molecular level
Key Findings
- •Cyclic phosphatidic acids, diacylglycerols, and hydroperoxide oxidation products of choline plasmalogens are elevated in both naturally infected and vaccinated horses
- •Triacylglycerols are uniquely elevated only in naturally infected horses' serum
- •Sphingomyelins are uniquely elevated only in vaccinated horses' serum
- •Serum lipidomic profiles may differentiate vaccine response from natural leptospiral infection