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• W1997262057 endingPage "123" @default.
• W1997262057 startingPage "115" @default.
• W1997262057 abstract "This review concerns stem cells and their relation to intestinal metaplasia. When gastric regions of mice, Mongolian gerbils or several strains of rats were irradiated with a total dose of 20 Gy of X-rays given in two fractions, intestinal metaplasia was only induced in rats. In addition, it was greatly influenced by rat strain and sex. Alkaline phosphatase (ALP) positive metaplastic foci were increased by administration of ranitidine (H2 receptor antagonist), crude stomach antigens or subtotal resection of the fundus and decreased by cysteamine (gastric acid secretion stimulator), histamine or removal of the submandibular glands. Recent studies have shown that Cdx2 transgenic mice with gastric achlorhydria develop intestinal metaplasia and that in men and animals, Helicobacter pylori (H. pyrlori) infection can cause intestinal metaplasias that are reversible on eradication. Our results combined with findings for H. pylori infection or eradication and transgenic mice suggest that an elevation in the pH of the gastric juice due to disappearance of parietal cells is one of the principal factors for development of reversible intestinal metaplasia. When different organs were transplanted into the stomach or duodenum, they were found to transdifferentiate into gastric or duodenal mucosae, respectively. Organ-specific stem cells in normal non-liver tissues (heart, kidney, brain and skin) also differentiate into hepatocytes when transplanted into an injured liver. Therefore, stem cells have a multipotential ability, transdifferentiating into different organs when transplanted into different environments. Finally, intestinal metaplasia has been found to possibly increase sensitivity to the induction of tumors by colon carcinogens of the 1,2-dimethylhydrazine (DMH), azoxymethane (AOM) or 2-amino-1-methyl-6-phenylimidazo[4.5-b]pyridine (PhIP) type. This carcinogenic process, however, may be relatively minor compared with the main gastric carcinogenesis process induced by N-methy1-N'-nitro-N-nitrosoguanidine (MMNG) or N-methylnitrosourea (MNU), which is not affected by the presence of intestinal metaplasia. The protocol used in these experiments may provide a new approach to help distinguish between developmental events associated with intestinal metaplasia and gastric tumors." @default.
• W1997262057 created "2016-06-24" @default.
• W1997262057 creator A5010867165 @default.
• W1997262057 date "2010-01-01" @default.
• W1997262057 modified "2023-09-29" @default.
• W1997262057 title "Intestinal Metaplasia -The Effect of Acid on the Gastric Mucosa and Gastric Carcinogenesis-" @default.
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• W1997262057 doi "https://doi.org/10.1293/tox.23.115" @default.
• W1997262057 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/3234614" @default.
• W1997262057 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/22272022" @default.
• W1997262057 hasPublicationYear "2010" @default.
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