Effect of Bifidobacterium longum and inulin on gut bacterial metabolism and carcinogen-induced aberrant crypt foci in rats.

Effect of Bifidobacterium longum and inulin on gut bacterial metabolism and carcinogen-induced... The effect of Bifidobacterium longum (4 x 10(8) viable cells/g diet) and a derivative of inulin ('Raftiline HP'; 5% w/w in diet) on colonic aberrant crypt foci (ACF) induced by the colon carcinogen azoxymethane (AOM) has been studied. The concentration of ammonia, a putative tumour promoter produced by bacterial degradation of protein and urea, and the activities of certain bacterial enzymes thought to play a role in colon carcinogenesis, beta-glucuronidase and beta-glucosidase were also assayed. Consumption of either B. longum or inulin was associated with a decrease (26 and 41%, respectively) in AOM-induced small ACF (i.e. those comprising 1-3 aberrant crypts per focus). Combined administration of the bifidobacterium and inulin resulted in more potent inhibition of ACF than administration of the two separately, achieving 80% inhibition of small ACF. Furthermore, the combined administration significantly decreased the incidence (by 59%) of large ACF (>4 aberrant crypts per focus), which are considered to be predictive of eventual tumour incidence. Since the dietary treatments were started 1 week after the carcinogen dose, the results suggest that B. longum and inulin may be affecting the early promotion phase of the carcinogenic process. Consumption of diets containing B. longum, inulin or both were also associated with decreases in beta-glucuronidase activity and ammonia concentration in the caecal contents. Both these factors have been associated with carcinogenesis of the colon in experimental animal models. In rats given inulin-containing diets (with or without B. longum) an increase in caecal wt and beta-glucosidase activity and a decrease in caecal pH were observed. The results suggest that consumption of B. longum or inulin was associated with potentially beneficial changes in caecal physiology and bacterial metabolic activity in relation to tumour risk and in the incidence of putative preneoplastic lesions in the colon. The results also indicated that combined treatment with the two agents was more effective in reducing colonic lesions. « Previous | Next Article » Table of Contents This Article Carcinogenesis (1998) 19 (2): 281-285. doi: 10.1093/carcin/19.2.281 » Abstract Free Full Text (PDF) Free Services Article metrics Alert me when cited Alert me if corrected Find similar articles Similar articles in Web of Science Similar articles in PubMed Add to my archive Download citation Request Permissions Citing Articles Load citing article information Citing articles via CrossRef Citing articles via Scopus Citing articles via Web of Science Citing articles via Google Scholar Google Scholar Articles by Rowland, I. R. Articles by Lievense, L. C. 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All efforts have been made to ensure accuracy, but the Publisher will not be held responsible for any remaining inaccuracies. If you require any further clarification, please contact our Customer Services Department. Online ISSN 1460-2180 - Print ISSN 0143-3334 Copyright © 2015 Oxford University Press Oxford Journals Oxford University Press Site Map Privacy Policy Cookie Policy Legal Notices Frequently Asked Questions Other Oxford University Press sites: Oxford University Press Oxford Journals China Oxford Journals Japan Academic & Professional books Children's & Schools Books Dictionaries & Reference Dictionary of National Biography Digital Reference English Language Teaching Higher Education Textbooks International Education Unit Law Medicine Music Online Products & Publishing Oxford Bibliographies Online Oxford Dictionaries Online Oxford English Dictionary Oxford Language Dictionaries Online Oxford Scholarship Online Reference Rights and Permissions Resources for Retailers & Wholesalers Resources for the Healthcare Industry Very Short Introductions World's Classics function fnc_onDomLoaded() { var query_context = getQueryContext(); PF_initOIUnderbar(query_context,":QS:default","","JRN"); PF_insertOIUnderbar(0); }; if (window.addEventListener) { window.addEventListener('load', fnc_onDomLoaded, false); } else if (window.attachEvent) { window.attachEvent('onload', fnc_onDomLoaded); } var gaJsHost = (("https:" == document.location.protocol) ? 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Effect of Bifidobacterium longum and inulin on gut bacterial metabolism and carcinogen-induced aberrant crypt foci in rats.

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Oxford University Press
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Copyright © 2015 Oxford University Press
ISSN
0143-3334
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1460-2180
DOI
10.1093/carcin/19.2.281
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Abstract

The effect of Bifidobacterium longum (4 x 10(8) viable cells/g diet) and a derivative of inulin ('Raftiline HP'; 5% w/w in diet) on colonic aberrant crypt foci (ACF) induced by the colon carcinogen azoxymethane (AOM) has been studied. The concentration of ammonia, a putative tumour promoter produced by bacterial degradation of protein and urea, and the activities of certain bacterial enzymes thought to play a role in colon carcinogenesis, beta-glucuronidase and beta-glucosidase were also assayed. Consumption of either B. longum or inulin was associated with a decrease (26 and 41%, respectively) in AOM-induced small ACF (i.e. those comprising 1-3 aberrant crypts per focus). Combined administration of the bifidobacterium and inulin resulted in more potent inhibition of ACF than administration of the two separately, achieving 80% inhibition of small ACF. Furthermore, the combined administration significantly decreased the incidence (by 59%) of large ACF (>4 aberrant crypts per focus), which are considered to be predictive of eventual tumour incidence. Since the dietary treatments were started 1 week after the carcinogen dose, the results suggest that B. longum and inulin may be affecting the early promotion phase of the carcinogenic process. Consumption of diets containing B. longum, inulin or both were also associated with decreases in beta-glucuronidase activity and ammonia concentration in the caecal contents. Both these factors have been associated with carcinogenesis of the colon in experimental animal models. In rats given inulin-containing diets (with or without B. longum) an increase in caecal wt and beta-glucosidase activity and a decrease in caecal pH were observed. The results suggest that consumption of B. longum or inulin was associated with potentially beneficial changes in caecal physiology and bacterial metabolic activity in relation to tumour risk and in the incidence of putative preneoplastic lesions in the colon. The results also indicated that combined treatment with the two agents was more effective in reducing colonic lesions. « Previous | Next Article » Table of Contents This Article Carcinogenesis (1998) 19 (2): 281-285. doi: 10.1093/carcin/19.2.281 » Abstract Free Full Text (PDF) Free Services Article metrics Alert me when cited Alert me if corrected Find similar articles Similar articles in Web of Science Similar articles in PubMed Add to my archive Download citation Request Permissions Citing Articles Load citing article information Citing articles via CrossRef Citing articles via Scopus Citing articles via Web of Science Citing articles via Google Scholar Google Scholar Articles by Rowland, I. R. Articles by Lievense, L. C. Search for related content PubMed PubMed citation Articles by Rowland, I. R. Articles by Rumney, C. J. Articles by Coutts, J. T. Articles by Lievense, L. C. Related Content Load related web page information Share Email this article CiteULike Delicious Facebook Google+ Mendeley Twitter What's this? Search this journal: Advanced » Current Issue November 2015 36 (11) Alert me to new issues The Journal About this journal Rights & Permissions Dispatch date of the next issue This journal is a member of the Committee on Publication Ethics (COPE) We are mobile – find out more Journals Career Network Impact factor: 5.334 5-Yr impact factor: 5.698 Editor-in-Chief Dr Curtis C Harris, USA View full editorial board For Authors Instructions to authors Online submission Submit Now! Self archiving policy Open access options for authors - visit Oxford Open This journal enables compliance with the NIH Public Access Policy Alerting Services Email table of contents Email Advance Access CiteTrack XML RSS feed Corporate Services Advertising sales Reprints Supplements var taxonomies = ("MED00710"); Most Most Read Apoptosis in cancer Modulation of E-cadherin expression by K-Ras; involvement of DNA methyltransferase-3b Assessing the carcinogenic potential of low-dose exposures to chemical mixtures in the environment: the challenge ahead Tumor progression and metastasis Cancer-related inflammation, the seventh hallmark of cancer: links to genetic instability » View all Most Read articles Most Cited Oxyradicals and DNA damage Sensing and repairing DNA double-strand breaks Functional role of estrogen metabolism in target cells: review and perspectives Apoptosis in cancer Nucleotide excision repair and human syndromes » View all Most Cited articles Disclaimer: Please note that abstracts for content published before 1996 were created through digital scanning and may therefore not exactly replicate the text of the original print issues. All efforts have been made to ensure accuracy, but the Publisher will not be held responsible for any remaining inaccuracies. If you require any further clarification, please contact our Customer Services Department. Online ISSN 1460-2180 - Print ISSN 0143-3334 Copyright © 2015 Oxford University Press Oxford Journals Oxford University Press Site Map Privacy Policy Cookie Policy Legal Notices Frequently Asked Questions Other Oxford University Press sites: Oxford University Press Oxford Journals China Oxford Journals Japan Academic & Professional books Children's & Schools Books Dictionaries & Reference Dictionary of National Biography Digital Reference English Language Teaching Higher Education Textbooks International Education Unit Law Medicine Music Online Products & Publishing Oxford Bibliographies Online Oxford Dictionaries Online Oxford English Dictionary Oxford Language Dictionaries Online Oxford Scholarship Online Reference Rights and Permissions Resources for Retailers & Wholesalers Resources for the Healthcare Industry Very Short Introductions World's Classics function fnc_onDomLoaded() { var query_context = getQueryContext(); PF_initOIUnderbar(query_context,":QS:default","","JRN"); PF_insertOIUnderbar(0); }; if (window.addEventListener) { window.addEventListener('load', fnc_onDomLoaded, false); } else if (window.attachEvent) { window.attachEvent('onload', fnc_onDomLoaded); } var gaJsHost = (("https:" == document.location.protocol) ? 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Journal

CarcinogenesisOxford University Press

Published: Feb 1, 1998

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