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The Effect of a Mediterranean Meal on Sprague Dawley Rats DMBA-Induced Mammary Tumors
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The Effect of a Mediterranean Meal on Sprague Dawley Rats DMBA-Induced Mammary Tumors
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Journal Article
The Effect of a Mediterranean Meal on Sprague Dawley Rats DMBA-Induced Mammary Tumors
2010
Overview
Paula C. Pereira1, A. Filipa Vicente1, Maria F. Mesquita1 and António S. Cabrita21Laboratório de Bioquímica, CiiEm (Centro de Investigação Interdisciplinar Egas Moniz), Egas Moniz, Cooperativa de Ensino Superior, C.R.L., Quinta da Granja, Monte de Caparica, 2829-5911 Caparica, Portugal. 2Institute of Experimental Pathology, Faculty of Medicine, Coimbra University Rua Larga, 3004-504 Coimbra, Portugal. AbstractThe present study intents to find a possible protective role of a Mediterranean type meal on mammary carcinogenesis. Several factors have been associated with breast cancer risk, genetics and environment are the most pointed out in epidemiologic and experimental studies. Diet is an environmental factor that can promote or prevent disease, being responsible for almost 35% of total cancer cases. A total of 72 female rats 50 days old were randomly divided in three groups of 24 rats and housed 4 in each plastic cage in a holding room under constant conditions of 22 ± 2 °C, 55 ± 10% humidity and a 12 h light/dark cycle. All the animals were submitted to the administration of 20 mg of 7, 12 dimethylbenzanthracene (DMBA) in olive oil, by gavages, except group A. The same defined standard food was provided for all the animals in group A and B, supplemented with a Mediterranean meal in group C. All the animals were sacrificed by the end of 150 days. Total carcinoma number did not differ significantly between Groups B and C and there were not found any neoplastic lesions in Group A. Most tumors showed a mixed architectural pattern, with cribriform and papillary areas, comedocarcinoma and necrosis was only seen in Group B. Histopathologic analysis showed that Group C tumors had lower mitotic activity and Pattern Grades, but higher Nuclear Grades. Mediterranean diet type meal showed lower Pattern Grades and lower Mitotic count in spite of that a higher nuclear pleomorphism was also found. Even so, tumors from Group C were better differentiated which can indicate lower malignancy.
Publisher
SAGE Publishing,SAGE Publications,Sage Publications Ltd. (UK)
Subject
