Neuroinflammatory reactions in experimental gastric ulcer: Target for mucosal protection |
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Authors: | K Gyires |
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Institution: | (1) Department of Pharmacology, Semmelweis University of Medicine, Nagyvárad tér 4, H-1089 Budapest, Hungary |
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Abstract: | The effect of different opioids receptor agonists—morphine, DAGO (μ-agonists), DADLE, DPDPE and deltorphin II (δ-agonists)—on
gastric mucosal damage induced by either acidified ethanol or acidified aspirin was studied following subcutaneous (sc) administration
of these agonists. The results indicate that both μ and δ receptors are involved in gastroprotection. Morphine, DAGO and DADLE,
injected intracerebroventricularly, were also effective in both ulcer models. This suggests that gastric cytoprotection can
be induced also be central action, since gastric acid secretion is not involved in the pathomechanism of mucosal damage induced
by acidified ethanol. Interaction between the opioids and α2-adrenoceptors in gastroprotection is suggested by the findings that the gastroprotective effect of clonidine (0.09 μmol/kg
orally) was antagonized by opioid antagonists. As both naloxone (1.38 μmol/kg sc) and naltrindole (12 μmol/kg sc) exerted
antagonist effects, both μ and δ receptors are likely to be involved in presynaptic α2-receptor-mediated gastroprotection. |
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Keywords: | opioids α 2-agonists gastric mucosal defence |
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