Detrimental effects of nicotine on the acute gastric mucosal injury induced by ethanol: Role of asymmetric dimethylarginine
Canadian Journal of Physiology and Pharmacology, ISSN: 0008-4212, Vol: 86, Issue: 12, Page: 835-840
2008
- 7Citations
- 11Captures
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Metrics Details
- Citations7
- Citation Indexes7
- CrossRef3
- Captures11
- Readers11
- 11
Article Description
The aim of this study was to determine whether asymmetric dimethylarginine (ADMA), an endogenous inhibitor of nitric oxide synthase (NOS), is responsible for the detrimental effects of nicotine on ethanol-induced gastric mucosal injury and its underlying mechanisms. Gastric mucosal injury was induced by an injection of ethanol in the stomach in rats. Animals were pretreated with nicotine for 28 days before ethanol injection. The gastric mucosal ulcer index (UI) and the levels of ADMA and NO in gastric juice were determined. In vitro, the cultured mucosal epithelial cells were treated with nicotine in the presence or absence of ethanol. The concentration of ADMA in the culture medium and the ratio of cell apoptosis were measured, and the effect of nicotine or ADMA alone on cell apoptosis was also examined. In rats treated with ethanol, the UI and ADMA levels were increased and the NO level was decreased, and these effects of ethanol were augmented by pretreatment with nicotine. Administration of nicotine alone did not show significant impact on UI, ADMA level, or NO level. In vitro, incubation of human epithelial cells with ethanol induced cell injury accompanied by increased ADMA levels in the culture medium, an effect which was amplified in the presence of nicotine. Similarly, ethanol was able to induce epithelial cell apoptosis that was exacerbated by nicotine. Incubation of epithelial cells with nicotine alone did not induce cell apoptosis, but administration of ADMA alone did induce cell apoptosis. The results suggest that the gastric mucosal injury induced by ethanol is augmented by nicotine, which is related to the increased ADMA level. © 2008 NRC.
Bibliographic Details
http://www.scopus.com/inward/record.url?partnerID=HzOxMe3b&scp=57349090714&origin=inward; http://dx.doi.org/10.1139/y08-093; http://www.ncbi.nlm.nih.gov/pubmed/19088804; http://www.nrcresearchpress.com/doi/10.1139/Y08-093; http://www.nrcresearchpress.com/doi/pdf/10.1139/Y08-093; http://www.nrcresearchpress.com/doi/full-xml/10.1139/Y08-093
Canadian Science Publishing
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