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Levels and membrane localization of the c-K-ras p21 protein in lungs of mice of different genetic strains and effects of 2,3,7,8-tetrachlorodibenzo-p-dioxin (TCDD) and Aroclor 1254.

Levels and membrane localization of the c-K-ras p21 protein in lungs of mice of different genetic... Mutational activation of the K-ras oncogene often occurs in human and mouse lung adenocarcinomas. Since K-ras p21 functions in trans-membrane signaling, we have investigated whether the amount of this protein in lung cell membranes is a variable that could influence lung tumorigenesis, either due to genetic differences or in response to tumor promoters. The six mouse strains assessed showed little difference in the total lung K-ras p21 after immunoprecipitation and immunoblotting. However, amount of ras p21 in the membrane fraction showed significant differences, with C57BL/6 and BALB/c having 3-5-fold more than NIH Swiss, AKR and DBA mice. Interestingly, a congenic AKR strain having the Ahr(b-1) Ah receptor allele from C57BL/6 mice (designated AKR.B6Ah) had high lung membrane K-ras p21 similar to that of C57BL/6. To test for possible changes related to lung tumor promotion, mice were treated with a promotional dose of TCDD (5 nmol/kg). After 48 h C57BL/6 lungs showed an increase in p21 in both total and membrane fractions. BALB/c, DBA and Swiss mice showed an increase only in membranes. There was no change in the AKR and AKR.B6Ah. Aroclor 1254 (250 mg/kg) caused an increase in membrane/cytosol ratio in Swiss mice. Thus the membrane:cytosol K-ras p21 ratio may be influenced by the Ahr phenotype, and TCDD and PCBs can induce p21 or increase its membrane level in certain strains, but these properties are not fully dependent on Ahr receptor type. In confirmation of the relevance of these findings for the tumor target cell type, the immortalized alveolar type 2 E10 cell line presented K-ras p21 in membrane, and this was increased 4-fold by treatment with 10 nM TCDD. « Previous | Next Article » Table of Contents This Article Carcinogenesis (1998) 19 (3): 463-470. doi: 10.1093/carcin/19.3.463 » 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 Ramakrishna, G. Articles by Anderson, L. M. Search for related content PubMed PubMed citation Articles by Ramakrishna, G. Articles by Anderson, L. M. 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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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Levels and membrane localization of the c-K-ras p21 protein in lungs of mice of different genetic strains and effects of 2,3,7,8-tetrachlorodibenzo-p-dioxin (TCDD) and Aroclor 1254.

Carcinogenesis , Volume 19 (3) – Mar 1, 1998

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References (47)

Publisher
Oxford University Press
Copyright
Copyright © 2015 Oxford University Press
ISSN
0143-3334
eISSN
1460-2180
DOI
10.1093/carcin/19.3.463
Publisher site
See Article on Publisher Site

Abstract

Mutational activation of the K-ras oncogene often occurs in human and mouse lung adenocarcinomas. Since K-ras p21 functions in trans-membrane signaling, we have investigated whether the amount of this protein in lung cell membranes is a variable that could influence lung tumorigenesis, either due to genetic differences or in response to tumor promoters. The six mouse strains assessed showed little difference in the total lung K-ras p21 after immunoprecipitation and immunoblotting. However, amount of ras p21 in the membrane fraction showed significant differences, with C57BL/6 and BALB/c having 3-5-fold more than NIH Swiss, AKR and DBA mice. Interestingly, a congenic AKR strain having the Ahr(b-1) Ah receptor allele from C57BL/6 mice (designated AKR.B6Ah) had high lung membrane K-ras p21 similar to that of C57BL/6. To test for possible changes related to lung tumor promotion, mice were treated with a promotional dose of TCDD (5 nmol/kg). After 48 h C57BL/6 lungs showed an increase in p21 in both total and membrane fractions. BALB/c, DBA and Swiss mice showed an increase only in membranes. There was no change in the AKR and AKR.B6Ah. Aroclor 1254 (250 mg/kg) caused an increase in membrane/cytosol ratio in Swiss mice. Thus the membrane:cytosol K-ras p21 ratio may be influenced by the Ahr phenotype, and TCDD and PCBs can induce p21 or increase its membrane level in certain strains, but these properties are not fully dependent on Ahr receptor type. In confirmation of the relevance of these findings for the tumor target cell type, the immortalized alveolar type 2 E10 cell line presented K-ras p21 in membrane, and this was increased 4-fold by treatment with 10 nM TCDD. « Previous | Next Article » Table of Contents This Article Carcinogenesis (1998) 19 (3): 463-470. doi: 10.1093/carcin/19.3.463 » 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 Ramakrishna, G. Articles by Anderson, L. M. Search for related content PubMed PubMed citation Articles by Ramakrishna, G. Articles by Anderson, L. M. 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: Mar 1, 1998

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