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A Method for Evaluating the Reinforcing Properties of Ethanol in Rats without Water Deprivation, Saccharin Fading or Extended Access Training
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A mechanistic study of beta-adrenoceptor antagonists on ethanol-induced gastric damage

S K Kaan1, Q B Mei, C H Cho

  • 1Department of Pharmacology, Faculty of Medicine, University of Hong Kong.

European Journal of Pharmacology
|December 12, 1996
PubMed

Insights

Beta-2 adrenoceptor antagonists, like butoxamine, reduce gastric ulcers by inhibiting neutrophil infiltration and increasing prostaglandin E2 levels. Propranolol also showed anti-ulcer effects, while metoprolol did not.

Area of Science:

  • Pharmacology
  • Gastroenterology
  • Inflammation research

Background:

  • Beta-adrenoceptor antagonists are used clinically, but their specific roles in anti-ulcer effects require elucidation.
  • Myeloperoxidase (MPO) and prostaglandin E2 (PGE2) are implicated in gastric mucosal injury and protection.

Purpose of the Study:

  • To investigate the roles of beta-adrenoceptor subtypes, MPO, and PGE2 in the anti-ulcer effects of beta-adrenoceptor antagonists.
  • To determine the specific beta-adrenoceptor subtype responsible for the anti-ulcer activity.

Main Methods:

  • Administration of non-selective (propranolol) and selective (metoprolol - beta 1, butoxamine - beta 2) beta-adrenoceptor antagonists.
  • Induction of gastric mucosal damage using ethanol.
  • Assessment of mucosal damage, MPO activity, neutrophil count, and PGE2 levels.

Main Results:

  • Propranolol and butoxamine (oral/intraperitoneal) reduced ethanol-induced gastric mucosal damage and MPO activity.
  • Butoxamine and propranolol reversed ethanol-induced increases in blood neutrophil count.
  • Metoprolol did not significantly affect MPO activity, neutrophil count, or mucosal damage.
  • Oral propranolol and butoxamine increased mucosal PGE2 levels.

Conclusions:

  • Beta-2 adrenoceptor blockade specifically inhibits inflammatory responses, such as neutrophil infiltration, in gastric mucosa.
  • This beta-2 mediated inhibition contributes to the anti-ulcer effects of propranolol and butoxamine.
  • Increased mucosal PGE2 levels by propranolol and butoxamine may also contribute to their gastroprotective actions.

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