The effect of drugs used in the treatment of osteoarthrosis on stromelysin (proteoglycanase) of equine synovial cell origin.

The research study explores the impact of different drugs, specifically phenylbutazone, flunixin, betamethasone, sodium hyaluronate, and polysulphated glycosaminoglycan (PSGAG), on an enzyme produced by horse synovial lining cells, stromelysin, which helps degrade proteoglycan, a necessary process implicated in the development of osteoarthrosis. Of these drugs, only PSGAG showed potential to inhibit the action of this enzyme at concentrations likely to be therapeutically effective in the equine fetlock joint.

Context and Aim of Research

• The research focuses on osteoarthrosis, a disease of the joints characterized by the degradation of a type of protein called proteoglycan. The researchers explore the enzyme stromelysin, produced by horse synovial lining cells, which helps with this degradation.
• The objective of the study is to investigate the effectiveness of different drugs – phenylbutazone, flunixin, betamethasone, sodium hyaluronate, and PSGAG – in inhibiting the action of stromelysin on a substrate labeled with radiocarbon (14C).
• The reason for this research is to contribute to the diagnosis and treatment of osteoarthrosis.

Methodology and Findings

• In vitro techniques were used to stimulate equine synovial cells to produce the stromelysin enzyme.
• Each of the four drugs was tested for its ability to inhibit the action of stromelysin on a radiocarbon-labeled casein substrate.
• The researchers found that only PSGAG could inhibit the enzyme’s activity at concentrations that are likely therapeutically achievable in the equine fetlock joint.

Significance of the Research

• This research has significant implications for the treatment of osteoarthrosis, suggesting that PSGAG could be a potent therapeutic agent.
• The ability of PSGAG to inhibit stromelysin activity could slow the degradation of proteoglycan, potentially mitigating the damage to the joint caused by this disease.
• The research also provides insight into the characteristics and behavior of the stromelysin enzyme, insights that could aid further studies into the pathogenesis of osteoarthrosis.