| Uroguanylin treatment suppresses polyp formation in the Apc(Min/+) mouse and induces apoptosis in human colon adenocarcinoma cells via cyclic GMP. | |
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MedLine Citation:
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PMID: 11016642 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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The enteric peptides, guanylin and uroguanylin, are local regulators of intestinal secretion by activation of receptor-guanylate cyclase (R-GC) signaling molecules that produce cyclic GMP (cGMP) and stimulate the cystic fibrosis transmembrane conductance regulator-dependent secretion of Cl- and HCO3-. Our experiments demonstrate that mRNA transcripts for guanylin and uroguanylin are markedly reduced in colon polyps and adenocarcinomas. In contrast, a specific uroguanylin-R-GC, R-GCC, is expressed in polyps and adenocarcinomas at levels comparable with normal colon mucosa. Activation of R-GCC by uroguanylin in vitro inhibits the proliferation of T84 colon cells and elicits profound apoptosis in human colon cancer cells, T84. Therefore, down-regulation of gene expression and loss of the peptides may interfere with renewal and/or removal of the epithelial cells resulting in the formation of polyps, which can progress to malignant cancers of the colon and rectum. Oral replacement therapy with human uroguanylin was used to evaluate its effects on the formation of intestinal polyps in the Min/+ mouse model for colorectal cancer. Uroguanylin significantly reduces the number of polyps found in the intestine of Min/+ mice by approximately 50% of control. Our findings suggest that uroguanylin and guanylin regulate the turnover of epithelial cells within the intestinal mucosa via activation of a cGMP signaling mechanism that elicits apoptosis of target enterocytes. The intestinal R-GC signaling molecules for guanylin regulatory peptides are promising targets for prevention and/or therapeutic treatment of intestinal polyps and cancers by oral administration of human uroguanylin. |
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Authors:
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K Shailubhai; H H Yu; K Karunanandaa; J Y Wang; S L Eber; Y Wang; N S Joo; H D Kim; B W Miedema; S Z Abbas; S S Boddupalli; M G Currie; L R Forte |
Publication Detail:
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Type: Journal Article |
Journal Detail:
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Title: Cancer research Volume: 60 ISSN: 0008-5472 ISO Abbreviation: Cancer Res. Publication Date: 2000 Sep |
Date Detail:
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Created Date: 2000-10-13 Completed Date: 2000-10-13 Revised Date: 2006-11-15 |
Medline Journal Info:
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Nlm Unique ID: 2984705R Medline TA: Cancer Res Country: UNITED STATES |
Other Details:
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Languages: eng Pagination: 5151-7 Citation Subset: IM |
Affiliation:
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Cancer Chemoprevention Group Nutrition Sector, Monsanto Life Sciences Company, St. Louis, Missouri 63167, USA. |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Adenocarcinoma
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drug therapy,
pathology* Adenomatous Polyposis Coli / genetics, prevention & control* Aged Aged, 80 and over Amino Acid Sequence Animals Apoptosis / drug effects*, physiology Caco-2 Cells / drug effects Colonic Neoplasms / drug therapy, pathology* Cyclic GMP / physiology* Down-Regulation / drug effects Female Gastrointestinal Hormones* Gene Expression Regulation, Neoplastic / drug effects Humans Male Mice Mice, Inbred C57BL Middle Aged Molecular Sequence Data Natriuretic Peptides Peptides / genetics, metabolism, pharmacology* RNA, Messenger / biosynthesis, genetics Receptors, Cell Surface / biosynthesis, genetics, physiology Tumor Cells, Cultured |
| Chemical | |
Reg. No./Substance:
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0/Gastrointestinal Hormones; 0/Natriuretic Peptides; 0/Peptides; 0/RNA, Messenger; 0/Receptors, Cell Surface; 140653-38-9/guanylin; 152175-68-3/uroguanylin; 7665-99-8/Cyclic GMP |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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