Medizinische Universität Graz Austria/Österreich - Forschungsportal - Medical University of Graz
Gewählte Publikation:
Holzer, P; Livingston, EH; Saria, A; Guth, PH.
Sensory neurons mediate protective vasodilatation in rat gastric mucosa.
AMER J PHYSIOL 1991 260: G363-G370.
Doi: 10.1152/ajpgi.1991.260.3.G363
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- Führende Autor*innen der Med Uni Graz
- Holzer Peter
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- Abstract:
- Sensory nerve stimulation by intragastric capsaicin (160 microM) prevents ethanol injury to the gastric mucosa and facilitates gastric mucosal blood flow (GMBF). The present study examined whether the capsaicin-induced increase in GMBF accounts for mucosal protection. Gastric perfusion of capsaicin (160 microM) in urethan-anesthetized rats did not change blood pressure but significantly enhanced GMBF as measured by hydrogen gas clearance. The same increase in GMBF was seen when capsaicin was administered together with an injurious concentration of ethanol (25%). GMBF was facilitated by capsaicin in a dose-related manner (10-640 microM), and the dose-dependent vasodilatation was significantly correlated with a dose-dependent reduction of gross damage to the mucosa. Histology showed that capsaicin prevented deep but not superficial mucosal damage. The vasodilator and protective effects of capsaicin resulted from stimulation of sensory neurons and propagation of nerve activity, since they were blocked after ablation of capsaicin-sensitive neurons or local intra-arterial infusion of tetrodotoxin. This and the finding of a limited access of intragastric capsaicin to the gastric wall indicates that the vasodilator and protective effects of capsaicin are mediated by a neural reflex. It is concluded that facilitation of GMBF is the major mechanism of sensory nerve-mediated prevention of gastric mucosal injury.
- Find related publications in this database (using NLM MeSH Indexing)
- Animals -
- Capsaicin - pharmacology
- Ethanol - pharmacology
- Gastric Mucosa - blood supply
- Gastrointestinal Motility - drug effects
- Male - drug effects
- Neurons, Afferent - drug effects
- Rats - drug effects
- Rats, Inbred Strains - drug effects
- Reference Values - drug effects
- Regional Blood Flow - drug effects
- Research Support, Non-U.S. Gov't - drug effects
- Research Support, U.S. Gov't, Non-P.H.S. - drug effects
- Research Support, U.S. Gov't, P.H.S. - drug effects
- Tetrodotoxin - pharmacology
- Vasodilation - pharmacology
- Find related publications in this database (Keywords)
- Capsaicin
- Gastric Mucosal Blood Flow
- Hydrogen Gas Clearance
- Laser Doppler Velocimetry
- Ethanol
- Gross Mucosal Damage
- Histological Injury
- Gastric Mucosal Protection
- Tetrodotoxin
- Gastric Motility