Nerve growth factor in the equine joint.
Authors: Kendall A, Nyström S, Ekman S, Hultén L M, Lindahl A, Hansson E, Skiöldebrand E
Journal: Veterinary journal (London, England : 1997)
Summary
# Editorial Summary: Nerve Growth Factor in Equine Joints Nerve growth factor (NGF) has emerged as a significant biomarker for joint pathology in humans and dogs, where elevated synovial concentrations correlate with osteoarthritic progression and pain; however, this relationship remained unexplored in horses despite osteoarthritis being highly prevalent in equine practice. Kendall and colleagues quantified NGF in synovial fluid samples from healthy joints (n=16), osteoarthritic joints (n=27), and acutely infected septic joints (n=9) using ELISA, whilst also mapping the distribution of NGF and its two receptors (TrkA and p75NTR) within cartilage tissue through immunohistochemistry. Both osteoarthritic and septic joints demonstrated significantly elevated NGF concentrations compared to healthy controls (P=0.032 and P=0.006 respectively), with pronounced immunostaining for NGF and its receptors observed in severely degenerative cartilage relative to normal tissue. These findings suggest NGF may serve as a diagnostic or prognostic marker for joint disease in horses and potentially contribute to pain signalling and cartilage degradation pathways, offering farriers, veterinarians and rehabilitation professionals a novel target for understanding disease mechanisms. Future research should investigate the functional roles of NGF receptor signalling and explore whether modulating NGF activity might represent a therapeutic avenue for managing equine osteoarthritis and post-septic joint complications.
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Practical Takeaways
- •NGF levels in synovial fluid may serve as a biomarker to differentiate healthy joints from those with osteoarthritis or septic inflammation in horses
- •Understanding NGF signalling pathways in equine joints could inform development of novel therapeutic targets for osteoarthritis management
- •Further research on NGF receptor expression and downstream signalling is needed to translate these findings into clinical applications for joint disease in horses
Key Findings
- •NGF concentration was significantly higher in synovial fluid from osteoarthritic joints compared to healthy joints (P = 0.032)
- •NGF concentration was significantly higher in synovial fluid from acutely septic joints compared to healthy joints (P = 0.006)
- •NGF and its receptors (TrkA and p75NTR) showed more abundant immunohistochemistry staining in severely osteoarthritic cartilage than in normal cartilage
- •NGF is present in equine synovial fluid and articular cartilage, similar to findings in humans and dogs