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Gastroprotective effects of thromboxane receptor antagonists
M L Ogletree1, E H O'Keefe, S K Durham
1Department of Pharmacology, Bristol-Myers Squibb Pharmaceutical Research Institute, Princeton, New Jersey.
The Journal of Pharmacology and Experimental Therapeutics
|October 1, 1992
Summary
New research shows potent thromboxane receptor antagonist SQ 33,961 effectively reduces gastric erosions caused by taurocholic acid and anti-inflammatory drugs in rats. This gastroprotective effect highlights potential therapeutic applications for this class of compounds.
Area of Science:
- Pharmacology
- Gastroenterology
- Drug Discovery
Background:
- Thromboxane receptor antagonists (TRAs) have shown potential in treating gastric ulcers.
- Earlier studies indicated antiulcer activity for short-acting TRAs.
- The discovery of potent, long-acting TRAs like SQ 33,961 necessitates further investigation.
Purpose of the Study:
- To evaluate the gastroprotective effects of the thromboxane receptor antagonist SQ 33,961.
- To determine the efficacy of SQ 33,961 against various gastric erosion models in rats.
- To assess if SQ 33,961 interferes with the anti-inflammatory or analgesic properties of other drugs.
Main Methods:
- Gastric erosions were induced using taurocholic acid, aspirin, and indomethacin in rat models.
- The dose-response relationship of SQ 33,961 was determined for taurocholate-induced erosions (ID50).
- Inhibition of aspirin- and indomethacin-induced gastric injury was assessed, and histological confirmation was performed. Efficacy against ethanol-induced erosions was also tested.
Main Results:
- SQ 33,961 demonstrated a dose-related reduction in taurocholate-induced gastric erosions (ID50 = 12 µg/kg).
- SQ 33,961 significantly inhibited gastric erosions induced by aspirin and indomethacin (ID50 values of 0.24 and 0.26 mg/kg, respectively).
- The gastroprotective effect was confirmed by histology and observed with a structurally unrelated TRA (BM 13,505). Efficacy against ethanol-induced erosions was limited.
Conclusions:
- SQ 33,961 exhibits significant gastroprotective activity against taurocholic acid and nonsteroidal anti-inflammatory drug-induced gastric erosions in rats.
- The compound's antiulcer potential is demonstrated without compromising the anti-inflammatory or analgesic effects of co-administered drugs.
- These findings support the therapeutic potential of potent thromboxane receptor antagonists in managing gastric mucosal injury.