Mechanisms of gastric antisecretory action of pentylenetetrazol in rats.

The present study investigated the mechanisms of gastric antisecretory action of pentylenetetrazol (PTZ) in pylorus-ligated rats. Pretreatment with indomethacin, phentolamine, propranolol, 6-hydroxydopamine, flunarizine and nifedipine, which were reported to antagonize seizures induced by PTZ, did not influence the gastric antisecretory action of PTZ. In contrast, pentobarbital and phenobarbital reverse the action of PTZ. These results suggest that prostaglandins production, adrenoceptors and calcium entry are not involved in the gastric antisecretory action of PTZ, and that the GABAA receptor complex plays an important role in the action induced by PTZ.