Effects of polysulfated glycosaminoglycan and hyaluronan on prostaglandin E2 production by cultured equine synoviocytes.

This research investigates how the anti-arthritic drugs hyaluronan and polysulfated glycosaminoglycan (PSGAG) affect inflammatory responses in equine synoviocytes, which are cells from horse joints. The results show that these drugs could potentially inhibit production of a compound known as prostaglandin E2 (PGE2) involved in inflammation, suggesting a possible mechanism of their anti-arthritis action.

Methods

• The researchers used synoviocytes, which are cells responsible for producing joint lubricating fluid, taken from the metacarpophalangeal joints (the joints in the lower limb of the horse’s legs) of four horses.
• These cells were grown in a controlled laboratory environment and treated with a common inflammatory stimulant called lipopolysaccharide (LPS), along with varying concentrations of hyaluronan or PSGAG.
• The cells were subjected to this treatment for a duration of 48 hours, and three different hyaluronan preparations were evaluated to compare effects.
• The researchers then tested for the amount of PGE2, a substance that typically signals inflammation, in the culture medium using a technique known as radioimmunoassay.

Results

• The results demonstrated that the highest concentrations of hyaluronan and PSGAG were able to inhibit the production of PGE2 by the treated synoviocytes.
• This indicates that these compounds may have an anti-inflammatory function, which could be a part of their arthritic treatment mechanism.

Conclusions

• It was noted that this anti-inflammatory action could only be observed when the mentioned compounds were administrated directly into the joints (intra-articular administration). Systemic administration, which involves delivering the drugs into the whole body system, did not produce the same results.
• This research suggests that hyaluronan and PSGAG could be effective in treating arthritis by inhibiting PGE2 synthesis in equine synoviocytes.