Aberrant crypt foci and colon cancer: comparison between a short- and medium-term bioassay for colon carcinogenesis using dimethylhydrazine in Wistar rats

Detalhes bibliográficos
Autor(a) principal: Rodrigues, Maria Aparecida Marchesan [UNESP]
Data de Publicação: 2002
Outros Autores: Silva, L. A. G. [UNESP], Salvadori, Daisy Maria Favero [UNESP], Camargo, João Lauro Viana de [UNESP], Montenegro, M. R. [UNESP]
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Repositório Institucional da UNESP
Texto Completo: http://dx.doi.org/10.1590/S0100-879X2002000300010
http://hdl.handle.net/11449/12851
Resumo: Aberrant crypt foci (ACF) in the colon of carcinogen-treated rodents are considered to be the earliest hallmark of colon carcinogenesis. In the present study the relationship between a short-term (4 weeks) and medium-term (30 weeks) assay was assessed in a model of colon carcinogenesis induced by dimethylhydrazine (DMH) in the rat. Six-week-old male Wistar rats were given subcutaneous injections of DMH (40 mg/kg) twice a week for 2 weeks and killed at the end of the 4th or 30th week. ACF were scored for number, distribution pattern along the colon and crypt multiplicity in 0.1% methylene-blue whole-mount preparations. ACF were distinguished from normal crypts by their larger size and elliptical shape. The incidence, distribution and morphology of colon tumors were recorded. The majority of ACF were present in the middle and distal colon of DMH-treated rats and their number increased with time. By the 4th week, 91.5% ACF were composed of one or two crypts and 8.5% had three or more crypts, while by the 30th week 46.9% ACF had three or more crypts. Thus, a progression of ACF consisting of multiple crypts was observed from the 4th to the 30th week. Nine well-differentiated adenocarcinomas were found in 10 rats by the 30th week. Seven tumors were located in the distal colon and two in the middle colon. No tumor was found in the proximal colon. The present data indicate that induction of ACF by DMH in the short-term (4 weeks) assay was correlated with development of well-differentiated adenocarcinomas in the medium-term (30 weeks) assay.
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spelling Aberrant crypt foci and colon cancer: comparison between a short- and medium-term bioassay for colon carcinogenesis using dimethylhydrazine in Wistar ratsAberrant crypt fociPreneoplastic lesionColon carcinogenesisAberrant crypt foci (ACF) in the colon of carcinogen-treated rodents are considered to be the earliest hallmark of colon carcinogenesis. In the present study the relationship between a short-term (4 weeks) and medium-term (30 weeks) assay was assessed in a model of colon carcinogenesis induced by dimethylhydrazine (DMH) in the rat. Six-week-old male Wistar rats were given subcutaneous injections of DMH (40 mg/kg) twice a week for 2 weeks and killed at the end of the 4th or 30th week. ACF were scored for number, distribution pattern along the colon and crypt multiplicity in 0.1% methylene-blue whole-mount preparations. ACF were distinguished from normal crypts by their larger size and elliptical shape. The incidence, distribution and morphology of colon tumors were recorded. The majority of ACF were present in the middle and distal colon of DMH-treated rats and their number increased with time. By the 4th week, 91.5% ACF were composed of one or two crypts and 8.5% had three or more crypts, while by the 30th week 46.9% ACF had three or more crypts. Thus, a progression of ACF consisting of multiple crypts was observed from the 4th to the 30th week. Nine well-differentiated adenocarcinomas were found in 10 rats by the 30th week. Seven tumors were located in the distal colon and two in the middle colon. No tumor was found in the proximal colon. The present data indicate that induction of ACF by DMH in the short-term (4 weeks) assay was correlated with development of well-differentiated adenocarcinomas in the medium-term (30 weeks) assay.Universidade Estadual Paulista Faculdade de Medicina Departamento de PatologiaUniversidade Estadual Paulista Faculdade de Medicina Departamento de PatologiaAssociação Brasileira de Divulgação Científica (ABRADIC)Universidade Estadual Paulista (Unesp)Rodrigues, Maria Aparecida Marchesan [UNESP]Silva, L. A. G. [UNESP]Salvadori, Daisy Maria Favero [UNESP]Camargo, João Lauro Viana de [UNESP]Montenegro, M. R. [UNESP]2014-05-20T13:37:11Z2014-05-20T13:37:11Z2002-03-01info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/article351-355application/pdfhttp://dx.doi.org/10.1590/S0100-879X2002000300010Brazilian Journal of Medical and Biological Research. Associação Brasileira de Divulgação Científica, v. 35, n. 3, p. 351-355, 2002.0100-879Xhttp://hdl.handle.net/11449/1285110.1590/S0100-879X2002000300010S0100-879X2002000300010S0100-879X2002000300010.pdf5051118752980903SciELOreponame:Repositório Institucional da UNESPinstname:Universidade Estadual Paulista (UNESP)instacron:UNESPengBrazilian Journal of Medical and Biological Research1.492info:eu-repo/semantics/openAccess2024-01-10T06:29:48Zoai:repositorio.unesp.br:11449/12851Repositório InstitucionalPUBhttp://repositorio.unesp.br/oai/requestopendoar:29462024-01-10T06:29:48Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP)false
dc.title.none.fl_str_mv Aberrant crypt foci and colon cancer: comparison between a short- and medium-term bioassay for colon carcinogenesis using dimethylhydrazine in Wistar rats
title Aberrant crypt foci and colon cancer: comparison between a short- and medium-term bioassay for colon carcinogenesis using dimethylhydrazine in Wistar rats
spellingShingle Aberrant crypt foci and colon cancer: comparison between a short- and medium-term bioassay for colon carcinogenesis using dimethylhydrazine in Wistar rats
Rodrigues, Maria Aparecida Marchesan [UNESP]
Aberrant crypt foci
Preneoplastic lesion
Colon carcinogenesis
title_short Aberrant crypt foci and colon cancer: comparison between a short- and medium-term bioassay for colon carcinogenesis using dimethylhydrazine in Wistar rats
title_full Aberrant crypt foci and colon cancer: comparison between a short- and medium-term bioassay for colon carcinogenesis using dimethylhydrazine in Wistar rats
title_fullStr Aberrant crypt foci and colon cancer: comparison between a short- and medium-term bioassay for colon carcinogenesis using dimethylhydrazine in Wistar rats
title_full_unstemmed Aberrant crypt foci and colon cancer: comparison between a short- and medium-term bioassay for colon carcinogenesis using dimethylhydrazine in Wistar rats
title_sort Aberrant crypt foci and colon cancer: comparison between a short- and medium-term bioassay for colon carcinogenesis using dimethylhydrazine in Wistar rats
author Rodrigues, Maria Aparecida Marchesan [UNESP]
author_facet Rodrigues, Maria Aparecida Marchesan [UNESP]
Silva, L. A. G. [UNESP]
Salvadori, Daisy Maria Favero [UNESP]
Camargo, João Lauro Viana de [UNESP]
Montenegro, M. R. [UNESP]
author_role author
author2 Silva, L. A. G. [UNESP]
Salvadori, Daisy Maria Favero [UNESP]
Camargo, João Lauro Viana de [UNESP]
Montenegro, M. R. [UNESP]
author2_role author
author
author
author
dc.contributor.none.fl_str_mv Universidade Estadual Paulista (Unesp)
dc.contributor.author.fl_str_mv Rodrigues, Maria Aparecida Marchesan [UNESP]
Silva, L. A. G. [UNESP]
Salvadori, Daisy Maria Favero [UNESP]
Camargo, João Lauro Viana de [UNESP]
Montenegro, M. R. [UNESP]
dc.subject.por.fl_str_mv Aberrant crypt foci
Preneoplastic lesion
Colon carcinogenesis
topic Aberrant crypt foci
Preneoplastic lesion
Colon carcinogenesis
description Aberrant crypt foci (ACF) in the colon of carcinogen-treated rodents are considered to be the earliest hallmark of colon carcinogenesis. In the present study the relationship between a short-term (4 weeks) and medium-term (30 weeks) assay was assessed in a model of colon carcinogenesis induced by dimethylhydrazine (DMH) in the rat. Six-week-old male Wistar rats were given subcutaneous injections of DMH (40 mg/kg) twice a week for 2 weeks and killed at the end of the 4th or 30th week. ACF were scored for number, distribution pattern along the colon and crypt multiplicity in 0.1% methylene-blue whole-mount preparations. ACF were distinguished from normal crypts by their larger size and elliptical shape. The incidence, distribution and morphology of colon tumors were recorded. The majority of ACF were present in the middle and distal colon of DMH-treated rats and their number increased with time. By the 4th week, 91.5% ACF were composed of one or two crypts and 8.5% had three or more crypts, while by the 30th week 46.9% ACF had three or more crypts. Thus, a progression of ACF consisting of multiple crypts was observed from the 4th to the 30th week. Nine well-differentiated adenocarcinomas were found in 10 rats by the 30th week. Seven tumors were located in the distal colon and two in the middle colon. No tumor was found in the proximal colon. The present data indicate that induction of ACF by DMH in the short-term (4 weeks) assay was correlated with development of well-differentiated adenocarcinomas in the medium-term (30 weeks) assay.
publishDate 2002
dc.date.none.fl_str_mv 2002-03-01
2014-05-20T13:37:11Z
2014-05-20T13:37:11Z
dc.type.status.fl_str_mv info:eu-repo/semantics/publishedVersion
dc.type.driver.fl_str_mv info:eu-repo/semantics/article
format article
status_str publishedVersion
dc.identifier.uri.fl_str_mv http://dx.doi.org/10.1590/S0100-879X2002000300010
Brazilian Journal of Medical and Biological Research. Associação Brasileira de Divulgação Científica, v. 35, n. 3, p. 351-355, 2002.
0100-879X
http://hdl.handle.net/11449/12851
10.1590/S0100-879X2002000300010
S0100-879X2002000300010
S0100-879X2002000300010.pdf
5051118752980903
url http://dx.doi.org/10.1590/S0100-879X2002000300010
http://hdl.handle.net/11449/12851
identifier_str_mv Brazilian Journal of Medical and Biological Research. Associação Brasileira de Divulgação Científica, v. 35, n. 3, p. 351-355, 2002.
0100-879X
10.1590/S0100-879X2002000300010
S0100-879X2002000300010
S0100-879X2002000300010.pdf
5051118752980903
dc.language.iso.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv Brazilian Journal of Medical and Biological Research
1.492
dc.rights.driver.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv 351-355
application/pdf
dc.publisher.none.fl_str_mv Associação Brasileira de Divulgação Científica (ABRADIC)
publisher.none.fl_str_mv Associação Brasileira de Divulgação Científica (ABRADIC)
dc.source.none.fl_str_mv SciELO
reponame:Repositório Institucional da UNESP
instname:Universidade Estadual Paulista (UNESP)
instacron:UNESP
instname_str Universidade Estadual Paulista (UNESP)
instacron_str UNESP
institution UNESP
reponame_str Repositório Institucional da UNESP
collection Repositório Institucional da UNESP
repository.name.fl_str_mv Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP)
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