Linked Life Data

9935233

Source:http://linkedlifedata.com/resource/pubmed/id/9935233

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pubmed-article:9935233pubmed:abstractTextTo determine whether colon crypt proliferative parameters were significantly altered by the stage of colon carcinogenesis or the type or location of colon tumors in rats, male Sprague-Dawley rats received an injection of the carcinogen 1,2-dimethylhydrazine (12 mg DMH base/kg body weight) or DMH vehicle once a week for 8 weeks, then were killed 24 weeks later. Three hours before sacrifice, rats were injected with 1 mg/kg body weight colchicine to arrest mitotic cells at metaphase. Transverse sections of the colon mucosa were taken 6 cm from the anus and at least 3 cm from any tumor, fixed in formalin, then stained with hematoxylin & eosin (H&E) for analyses of proliferative parameters. Only complete, mid-axial crypts were scored for mitotic count (MC), crypt proliferative zone (PZ) height and crypt height (CH). Serial tumor sections were stained with H&E for histological evaluation or used in immunohistochemical detection of transforming growth factor alpha (TGF alpha). DMH treatment significantly increased MC, PZ and CH regardless of tumor status. The PZ and CH of rats with a carcinoma located in the distal colon were significantly increased compared with DMH-treated rats without an adenocarcinoma (AC) or with rats which had a tumor located in the proximal colon. Distal colon ACs were found to be well differentiated and to have greater TGF alpha immunoreactivity than the generally less differentiated proximal colon carcinomas. Distal colon AC production and systemic circulation of a soluble colon crypt stimulating factor such as TGF alpha may explain the significant increase in PZ and CH in histologically normal colonic mucosa located away from the tumor.lld:pubmed
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pubmed-article:9935233pubmed:authorpubmed-author:BarnesC JCJlld:pubmed
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pubmed-article:9935233pubmed:dateRevised2007-11-14lld:pubmed
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pubmed-article:9935233pubmed:articleTitlePresence of well-differentiated distal, but not poorly differentiated proximal, rat colon carcinomas is correlated with increased cell proliferation in and lengthening of colon crypts.lld:pubmed
pubmed-article:9935233pubmed:affiliationDepartment of Medicine, University of Texas Health Science Center, San Antonio 78284, USA.lld:pubmed
pubmed-article:9935233pubmed:publicationTypeJournal Articlelld:pubmed
pubmed-article:9935233pubmed:publicationTypeResearch Support, U.S. Gov't, P.H.S.lld:pubmed
pubmed-article:9935233pubmed:publicationTypeResearch Support, Non-U.S. Gov'tlld:pubmed