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Dysregulation of gastric H,K-ATPase by cigarette smoke extract

World Journal of Gastroenterology 2009年第32期15卷 4016-4022页

作者： Muna Hammadi Mohamed Adi Rony John ghalia ak khoder Sherif M Karam Department of Anatomy Faculty of Medicine & Health SciencesUAE UniversityAl-AinPO Box 17666United Arab Emirates

AIM:To test whether the expression and activity of H,K-ATPase in parietal cells would be affected by cigarette smoke extract.METHODS: Extracts of cigarette smoke were administered into mice by gastric gavage (5 mg/kg body weight/day) for 3 d or in drinking water for 7 or 14 d. For the latter, each day a mouse consumed 5 mL water containing extracts of two cigarettes, on average. Control littermate mice received only vehicle. To compare the amount of H,K-ATPase in control and smoke-treated mice, the stomach was processed for Western blotting and immunohistochemical analysis using monoclonal antibodies specific for α- or β-subunits of H,K-ATPase. The p-nitrophenylphospatase activity assay was used as a measurement for K-dependent H,K-ATPase activity.RESULTS: Probed transblots showed an increase in the amount of H,K-ATPase in smoke-treated mice which was confirmed by immunohistochemistry and was found to be due to increased amounts of protein per parietal cell rather than an increased parietal cell number. The increase in the amount of H,K-ATPase was associated with an enhancement of its enzymatic activity. K-dependent activity in control and smoke-treated mice was significantly different (respectively, 0.12 μmol/mg vs 0.27 μmol/mg per minute, P<0.05).CONCLUSION: Administration of cigarette smoke extract is associated with an increase in the amount and activity of H,K-ATPase and hence, smokers are susceptible to development of peptic ulcer.

关键词：香烟烟雾提取物活性酶灌胃 ATP酶免疫小鼠失调单克隆抗体

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