Epithelial cell proliferation in the digestive tract induced by space restriction and water-immersion stress.
Cancer Lett
; 125(1-2): 141-8, 1998 Mar 13.
Article
em En
| MEDLINE
| ID: mdl-9566708
ABSTRACT
The effects of space restriction and water-immersion stress on epithelial cell proliferation in the digestive tract, with special attention to the esophagus, stomach and duodenum, in 8-week-old SD male rats were examined. Histological assessment revealed spotted hemorrhagic lesions in the fundus of the glandular stomach, accompanied by statistically increased 5-bromo-2'-deoxyuridine (BrdU) labeling index in the fundic and pyloric regions. Furthermore, biochemical analysis demonstrated an increased activity of ornithine decarboxylase (ODC) and spermidine/spermine N1-acetyltransferase (SAT), known as key late-limiting enzymes of the polyamine pathway, in the gastric fundus. The stress may induce a remarkable increase in expression of c-fos, c-jun and c-myc mRNAs in both fundic and pyloric regions of the glandular stomach. There were no remarkable changes in the esophagus. These results indicate that space restriction and water-immersion stress induced cell proliferation in the glandular stomach through overexpression of proto-oncogenes and increased ODC and SAT activities that might be related to the promotion of gastric carcinogenesis.
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Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Estômago
/
Estresse Fisiológico
/
Duodeno
/
Esôfago
Limite:
Animals
Idioma:
En
Revista:
Cancer Lett
Ano de publicação:
1998
Tipo de documento:
Article
País de afiliação:
Japão