Document Detail


Ethanol inhibits the motility of rabbit sphincter of Oddi in vitro.
MedLine Citation:
PMID:  15526367     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
AIM: The role of the sphincter of Oddi (SO) in ethanol (ETOH)-induced pancreatitis is controversial. Our aim was to characterise the effect of ETOH on basal and stimulated SO motility. METHODS: SOs removed from white rabbits were placed in an organ bath (Krebs solution, pH7.4, 37 degrees). The effects of 2 mL/L, 4 mL/L, 6 mL/L and 8 mL/L of ETOH on the contractile responses of the sphincter were determined. SOs were stimulated with either 0.1 mumol/L carbachol, 1 mumol/L erythromycin or 0.1 mumol/L cholecystokinin (CCK). RESULTS: ETOH at a dose of 4 mL/L significantly decreased the baseline contractile amplitude from 11.98+/-0.05 mN to 11.19+/-0.07 mN. However, no significant changes in the contractile frequency were observed. ETOH (0.6%) significantly decreased both the baseline amplitude and the frequency compared to the control group (10.50+/-0.01 mN, 12.13+/-0.10 mN and 3.53+/-0.13 c/min, 5.5+/-0.13 cycles(c)/min, respectively). Moreover, 0.8% of ETOH resulted in complete relaxation of the SO. Carbachol (0.1 micromol/L) or erythromycin (1 micromol/L) stimulated the baseline amplitudes (by 82% and 75%, respectively) and the contractile frequencies (by 150% and 106%, respectively). In the carbachol or erythromycin-stimulated groups 2-6 mL/L of ETOH significantly inhibited both the amplitude and the frequency. Interestingly, a 4-5 min administration of 0.6% ETOH suddenly and completely relaxed the SO. CCK (0.1 micromol/L) stimulated the baseline amplitude from 12.37+/-0.05 mN to 27.40+/-1.82 mN within 1.60+/-0.24 min. After this peak, the amplitude decreased to 17.17+/-0.22 mN and remained constant during the experiment. The frequency peaked at 12.8+/-0.2 c/min, after which the constant frequency was 9.43+/-0.24 c/min throughout the rest of the experiment. ETOH at a dose of 4 mL/L significantly decreased the amplitude from 16.13+/-0.23 mN to 14.93+/-0.19 mN. However, no significant changes in the contractile frequency were observed. ETOH at a dose of 6 mL/L inhibited both the amplitudes and the frequencies in the CCK-stimulated group, while 8 mL/L of ETOH completely relaxed the SO. CONCLUSION: ETOH strongly inhibits the basal, carbachol, erythromycin, and CCK-stimulated rabbit SO motility. Therefore, it is possible that during alcohol-intake the relaxed SO opens the way for pancreatic fluid to flow out into the duodenum in rabbits. This relaxation of the SO may protect the pancreas against alcohol-induced damage.
Authors:
Réka Sári; Attila Pálvölgyi; Zoltán Rakonczay; Tamás Takács; János Lonovics; László Czakó; Zoltán Szilvássy; Péter Hegyi
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Publication Detail:
Type:  In Vitro; Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  World journal of gastroenterology : WJG     Volume:  10     ISSN:  1007-9327     ISO Abbreviation:  World J. Gastroenterol.     Publication Date:  2004 Dec 
Date Detail:
Created Date:  2004-11-04     Completed Date:  2005-01-05     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  100883448     Medline TA:  World J Gastroenterol     Country:  China    
Other Details:
Languages:  eng     Pagination:  3470-4     Citation Subset:  IM    
Affiliation:
First Department of Medicine, Faculty of Medicine, University of Szeged, H-6701, Koranyi fasor 10, Hungary.
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MeSH Terms
Descriptor/Qualifier:
Animals
Carbachol / pharmacology
Central Nervous System Depressants / pharmacology*
Cholecystokinin / pharmacology
Cholinergic Agonists / pharmacology
Erythromycin / pharmacology
Ethanol / pharmacology*
Gastrointestinal Agents / pharmacology
Gastrointestinal Motility / drug effects
Male
Rabbits
Sphincter of Oddi / drug effects*,  physiology
Chemical
Reg. No./Substance:
0/Central Nervous System Depressants; 0/Cholinergic Agonists; 0/Gastrointestinal Agents; 114-07-8/Erythromycin; 51-83-2/Carbachol; 64-17-5/Ethanol; 9011-97-6/Cholecystokinin

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