Abstract:
:During the last decade, inflammation (carditis) and intestinal metaplasia localized to immediately below the human gastro-oesophageal junction have received much attention in relation to the rising incidence of cancer at this site. Since these histological findings are frequently observed even among those who are H pylori-negative, the causative factors for such histologic events at the human gastro-oesophageal junction remain obscure. A series of recent studies have demonstrated that a high level of salivary nitrite is sustained over several hours after the ingestion of a high nitrate meal, and that the nitrite in swallowed saliva is rapidly converted to nitric oxide by an acid catalyzed chemical reaction at the gastro-oesophageal junction. Eventually, a substantial amount of nitric oxide diffuses from the lumen into the adjacent tissue. Therefore, the human gastro-oesophageal junction is likely to be a region of high nitrosative stress. Considering the life-time exposure of the gastro-oesophageal junction to cytotoxic levels of nitric oxide, this may account for the high prevalence of inflammation, intestinal metaplasia, and subsequent development of neoplasia at this site. Although gastric acid, pepsin, and bile acid have been intensively investigated as a cause of adenocarcinoma at the gastro-oesophageal junction and the distal esophagus, nitric oxide and the related nitrosative stress should also be examined.
journal_name
World J Gastroenteroljournal_title
World journal of gastroenterologyauthors
Iijima K,Shimosegawa Tdoi
10.3748/wjg.v12.i36.5767subject
Has Abstractpub_date
2006-09-28 00:00:00pages
5767-71issue
36eissn
1007-9327issn
2219-2840journal_volume
12pub_type
社论,评审abstract:AIM:To investigate the chemopreventive effects of 1alpha, 25-dihydroxyvitamin D(3) in diethylnitrosamine induced, phenobarbital promoted rat hepatocarcinogenesis. METHODS:The rats were randomly divided into 6 different groups (A-F). Groups A, C and E rats received a single intraperitoneal (i.p.) injection of diethylni...
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