The bradykinin BK2 receptor mediates angiotensin II receptor type 2 stimulated rat duodenal mucosal alkaline secretion

Autor: Helander Herbert F, Holm Mathias, Johansson Berndt, Ewert Sara, Fandriks Lars
Jazyk: angličtina
Rok vydání: 2003
Předmět:
Zdroj: BMC Physiology
BMC Physiology, Vol 3, Iss 1, p 1 (2003)
ISSN: 1472-6793
Popis: Background This study investigates bradykinin and nitric oxide as potential mediators of AT2-receptor-stimulated duodenal mucosal alkaline secretion. Duodenal mucosal alkaline secretion was measured in methohexital- and α-chloralose-anaesthetised rats by means of in situ pH-stat titration. Immunohistochemistry and Western blot were used to identify the BK2 receptors. Results The AT2 receptor agonist CGP42112A (0.1 μg kg-1 min-1) administered intravenously increased the duodenal mucosal alkaline secretion by ~50 %. This increase was sensitive to the selective BK2 receptor blocker HOE140 (100 ng/kg iv), but not to luminal administration of the NOS blocker L-NAME (0.3 mM). Mean arterial pressure did not differ between groups during the procedures. Immunohistochemistry showed a distinct staining of the crypt epithelium and a moderate staining of basal cytoplasm in villus enterocytes. Conclusion The results suggest that the AT2-receptor-stimulated alkaline secretion is mediated via BK2 receptors located in the duodenal cryptal mucosal epithelium.
Databáze: OpenAIRE
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