In vitro effects of nonsteroidal anti-inflammatory agents and prostaglandins I2, E2, and F2alpha on contractility of taenia of the large colon of horses.

The research investigates the in vitro effects of specific prostaglandins and nonsteroidal anti-inflammatory drugs on the contraction activity of the large-colon taenia of horses, discovering that some increase activity, some inhibit it and that combinations may lead to potential intestinal issues.

Methodology

• The study involved 14 healthy horses from which segments of the taenia from the ventral colon were extracted.
• These taenia strips were then mounted in a controlled tissue bath system.
• The tissue bath contained an oxygenated Krebs buffer solution, maintained at a specific temperature.
• Various prostaglandins (PGE2, PGF2alpha, PGl2) and nonsteroidal anti-inflammatory drugs (flunixin meglumine, carprofen, ketoprofen, and phenylbutazone) were added to the baths in incremental doses.
• The contractile activity of the taenia tissues was monitored and recorded before and after the bath administrations.

Results

• The administration of prostaglandins PGE2 and PGF2alpha caused a significant increase in contractile activity.
• The PGI2 prostaglandin, on the other hand, resulted in an inhibitory contractile response.
• Nonsteroidal anti-inflammatory drugs (NSAIDs), overall, were found to inhibit contraction.
• Interestingly, at low concentrations, ketoprofen caused an excitatory effect before becoming inhibitory at higher doses.
• Carprofen, compared to the other tested NSAIDs, significantly reduced contractile activity even at lower concentrations.

Conclusions

• According to the study’s findings, PGE2 and PGF2alpha appeared to enhance the contractility of the large-colon taenia in horses while PGI2 inhibited the contractility in the in vitro model.
• Also, the administration of NSAIDs generally led to the inhibition of contractility, with the most potent effect observed with carprofen.
• The study concludes that introducing NSAIDs, along with the liberation of endogenous prostaglandins, may predispose horses to the development of intestinal stasis and possible impaction.