Urinary glycosaminoglycans in horse osteoarthritis. Effects of chondroitin sulfate and glucosamine.

This article discusses a study conducted on horses to assess the impact of chondroitin sulfate (CS) and glucosamine (GlcN) on osteoarthritis. The researchers found that the levels of urinary glycosaminoglycans (GAGs) were elevated in horses with osteoarthritis. After treatment with CS and GlcN, there was an increase in specific urinary GAGs and a significant improvement in joint flexibility.

Objective of the Study

• The primary aim of the research was to analyze the urinary excretion of glycosaminoglycans (GAGs), a component of the cartilage matrix, in horses suffering from osteoarthritis.
• Additionally, the study aimed to investigate the effects of supplements chondroitin sulfate (CS) and glucosamine (GlcN) on osteoarthritis in the equine subjects.

Study Subjects and Methodology

• The study was performed on a total of 47 athletic horses, out of which 20 were healthy and 27 were diagnosed with osteoarthritis.
• The effects of CS and GlcN were primarily observed in horses with mild osteoarthritis.
• The research focused on the increased excretion of urinary GAGs in horses with osteoarthritis compared to the healthy control group.

Study Findings

• The study showed that urinary GAGs were increased in horses with osteoarthritis – an observation that was consistent even in cases of mild osteoarthritis affecting only one joint.
• Treatment using a combination of CS and GlcN resulted in a sustained increase in the urinary CS and another type of GAG, keratan sulfate (KS).
• Substantial improvement was also observed in the flexibility of the tarsocrural and metacarpophalangeal joints – the joints located in the horse’s lower limbs.

Significance and Conclusion

• The results suggest that the urinary levels of CS and KS may be reflective of the turnover rates of cartilage matrix proteoglycans, which are proteins bound with GAGs and form a significant part of the joint cartilage.
• The measurement of these compounds in the urine could thus provide a valuable and objective manner of evaluating and monitoring joint diseases like osteoarthritis.