Estudo "in vivo" da atividade antiinflamatoria de inibidores de secreção acida

AUTOR(ES)
DATA DE PUBLICAÇÃO

2005

RESUMO

Helicobacter pylori infection and the administration of nonsteroidal antiinflammatory drugs are the main causes of gastric ulcerations. In the clinical setting, patients with gastric ulcerations are treated with histamine-2 (H2) receptor antagonists and proton pump inhibitors (PPI) to neutralize or reduce the acid secretion. Recently, studies have shown that these drugs have additional properties related to their capacity to inhibit some neutrophil functions. Since the damage to gastric mucosa, associated with H. pylori or nonsteroidal anti-inflammatory drugs, is also induced by neutrophils these properties could be beneficial. In the present study, we characterized the inflammatory response induced by H. pylori in the rat air pouch model. We also evaluated the anti-inflammatory activity of acid secretion inhibitors such as omeprazole, lanzoprazole, pantoprazole and cimetidine in this experimental model. The injection of H. pylori into rat air pouch caused pronounced neutrophil infiltration. This response was dependent upon the number of bacteria injected and independent of bacterial viability and genotype. The duration of treatment with the acid secretion inhibitors did not affect the ability of neutrophils to migrate in response to H. py/ori or carrageenan. On the other hand, dexamethasone, a classic anti-inflammatory drug, reduced the exudate formation and leukocyte migration. Our results indicate that proton pump inhibitors or histamine-2 receptor antagonists have no anti-inflammatory activity in vivo

ASSUNTO(S)

neutrofilos bombas de proton helicobacter pylori

ACESSO AO ARTIGO

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