Abstract
Selective COX-2 inhibitors have been shown to produce fewer gastrointestinal adverse reactionsthan classical NSAIDs. Nevertheless, these new agents may worsen and delay the healing of ex-perimentallyinduced gastric ulcers in animals. In this study, we compared the effects of a selectiveCOX-2 inhibitor (celecoxib), a preferential COX-1 inhibitor (piroxicam), and a nonnarcotic anal-gesic(metamizol) on normal gastric mucosa of rats and, on the other hand, in a setting of preexistingacute gastric lesions induced by 0.6 N hydrochloric acid. Under normal conditions, only piroxicamproduced appreciable gastric lesions. However, after acid challenge the three assayed drugs inducedsignificant macroscopic and microscopic damage. Myeloperoxidase activity as an index of neutrophilinfiltration was elevated with celecoxib and piroxicam on normal gastric mucosa. On inflamed mu-cosa,celecoxib augmented enzymatic activity at the lower dose, which was parallelled by an increasein the interleukin 1β level. Acid instillaton produced a significant rise in PGE2 content at 7 hr. Drugtreatment after acid challenge decreased prostaglandin values in all cases, although to a lesser extentthan after single drug dose administration. COX-2 mRNA expression was visible 1 hr after acidapplication, whereas COX-2 protein could only be detected at 7 hr. Piroxicam increased both ex-pressionlevels. All NSAIDs enhanced transforming growth factor α and epidermal growth factorreceptor immunoreactivity around the acid-induced lesions. It is concluded that selective COX-2inhibitors, like conventional NSAIDs, impair the healing of gastric damage, and therefore specialattention should be paid in patients with gastric pathologies.
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Berenguer, B., De la Lastra, C.A., Motilva, V. et al. Effects of Celecoxib on Acid-Challenged Gastric Mucosa of Rats: Comparison with Metamizol and Piroxicam. Dig Dis Sci 49, 937–947 (2004). https://doi.org/10.1023/B:DDAS.0000034552.20917.5e
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DOI: https://doi.org/10.1023/B:DDAS.0000034552.20917.5e