Câmara PRS, Ferraz GJN, Velloso LA, Zeitune JMR, Suassuna FAB, Ferraz JGP. Endothelin and neonatal capsaicin regulate gastric resistance to injury in BDL rats.
World J Gastrointest Pathophysiol 2012;
3:85-91. [PMID:
23293745 PMCID:
PMC3536844 DOI:
10.4291/wjgp.v3.i4.85]
[Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/14/2012] [Revised: 08/06/2012] [Accepted: 08/10/2012] [Indexed: 02/06/2023] Open
Abstract
AIM: To investigate the relationship between primary afferent neurons, endothelin (ET) and the role of its receptors on ethanol-induced gastric damage in cirrhotic rats.
METHODS: Cirrhosis and portal hypertension were induced in rats by bile duct ligation (BDL) while controls had a sham operation. The association between ET and afferent neurons on the gastric mucosa was evaluated by capsaicin treatment in newborn rats, the use of ET agonists or antagonists, gastric ET-1 and -3 mRNA and synthetic capacity. Ethanol-induced damage was assessed using ex vivo gastric chamber experiments. Gastric blood flow was measured by laser-Doppler flowmetry.
RESULTS: ET-3 and an ETB receptor antagonist significantly reduced the extent of ethanol-induced gastric damage in BDL rats. Gastric ET-1 and -3 levels were 30% higher in BDL rats compared to control rats. Capsaicin treatment restored the gastric resistance and blood flow responses to topical application of ethanol in BDL rats and ET-1 and -3 production to levels observed in controls.
CONCLUSION: Our results suggest that the reduced resistance of the gastric mucosa of cirrhotic rats to ethanol-induced injury is a phenomenon modulated by ET through the ETB receptor and by sensory afferent neurons.
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