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Bilateral intra-amygdalar (i/am) microinjections of TRH (1 and 10 micrograms) and physostigmine (10 micrograms) into the central nucleus (CEA) aggravated cold restraint stress (3 hr at 4 degrees C) induced gastric ulcer formation in rats, whereas atropine (1, 5 and 10 micrograms) attenuated this phenomenon. Similar stress ulcer reducing effects were seen with chlordiazepoxide (CDP, 10 mg/kg, IP) and midazolam (1, 3 and 10 micrograms, i/am). Pretreatment of rats with atropine or CDP antagonized the ulcerogenic effects of both TRH and physostigmine. Further, when administered intra-CEA, midazolam neutralized the effects of TRH in a dose-related manner. These results are discussed in light of TRH-acetylcholine-benzodiazepine/GABA interactions within the amygdaloid complex during stress ulcer formation.
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