Document Detail


Dietary fat versus caloric content in initiation and promotion of 7,12-dimethylbenz(a)anthracene-induced mammary tumorigenesis in rats.
MedLine Citation:
PMID:  6430545     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Enhancement of mammary tumor formation by dietary fat may be mediated via increased caloric intake. Three experiments were performed to study this relationship in 7,12-dimethyl-benz(a)anthracene (DMBA)-treated female Sprague-Dawley rats: (a) high- or low-fat isocaloric diets were fed in a crossover design; (b) low-fat, high-calorie and high-fat, low-calorie diets were fed in a crossover design; (c) pair-fed rats were restricted to 60% of the calories of controls with ad libitum access to food beginning 10 days after DMBA administration. The pair-fed rats received daily 60% of calories, the same level of fiber, and 115% more fat than did rats fed ad libitum. Tumor yield but not tumor incidence was greater in rats fed high-fat rather than low-fat isocaloric diets prior to initiation of tumorigenesis. A low-fat, high-calorie diet led to more tumor incidence and yield than was associated with feeding of a high-fat, low-calorie diet. Caloric restriction (although with concomitant intake of more fat) led to complete inhibition of tumor formation. These results indicate that both high-fat and high-calorie diets exhibit cocarginogenic, not merely promotional, properties. Caloric intake may be a greater determinant than dietary fat of a tumor-enhancing regimen. Finally, restriction of caloric intake during promotion markedly suppresses tumor formation, despite the increased fat content of the restricted diet, suggesting a permissive role for calories in tumor formation. The possibility remains that alterations in levels of other dietary components could also have contributed to the observed effects.
Authors:
D Kritchevsky; M M Weber; D M Klurfeld
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Publication Detail:
Type:  Comparative Study; Journal Article; Research Support, Non-U.S. Gov't; Research Support, U.S. Gov't, P.H.S.    
Journal Detail:
Title:  Cancer research     Volume:  44     ISSN:  0008-5472     ISO Abbreviation:  Cancer Res.     Publication Date:  1984 Aug 
Date Detail:
Created Date:  1984-08-29     Completed Date:  1984-08-29     Revised Date:  2007-11-14    
Medline Journal Info:
Nlm Unique ID:  2984705R     Medline TA:  Cancer Res     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  3174-7     Citation Subset:  IM    
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MeSH Terms
Descriptor/Qualifier:
9,10-Dimethyl-1,2-benzanthracene
Animals
Dietary Fats*
Energy Intake
Female
Mammary Neoplasms, Experimental / chemically induced,  physiopathology*
Rats
Rats, Inbred Strains
Time Factors
Grant Support
ID/Acronym/Agency:
HL-00734/HL/NHLBI NIH HHS
Chemical
Reg. No./Substance:
0/Dietary Fats; 57-97-6/9,10-Dimethyl-1,2-benzanthracene

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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