PROMOTION OF ABERRANT CRYPT FOCI AND CANCER IN RAT COLON BY THERMOLYZED PROTEIN

被引:74
作者
ZHANG, XM
STAMP, D
MINKIN, S
MEDLINE, A
CORPET, DE
BRUCE, WR
ARCHER, MC
机构
[1] UNIV TORONTO, ONTARIO CANC INST, DEPT MED BIOPHYS, 500 SHERBOURNE ST, TORONTO M4X 1K9, ONTARIO, CANADA
[2] INRA, F-31300 TOULOUSE, FRANCE
[3] UNIV TORONTO, DEPT PATHOL, TORONTO M5S 1A1, ONTARIO, CANADA
来源
JNCI-JOURNAL OF THE NATIONAL CANCER INSTITUTE | 1992年 / 84卷 / 13期
关键词
D O I
10.1093/jnci/84.13.1026
中图分类号
R73 [肿瘤学];
学科分类号
100214 ;
摘要
Background: We have previously shown that thermolyzed protein (casein) cooked with fat in the diet of the rat promotes the growth of aberrant crypt foci (putative precursors of colon cancer) assessed at 100 days. Purpose: To determine how thermolysis affects this promotion, we examined thermolysis conditions, quantity of thermolyzed protein in the diet, and duration of thermolysis. To determine whether the previous finding of promotion of aberrant crypt foci corresponds to promotion of cancers assessed much later, we carried out promotion studies until colon cancers appeared. Methods: F344 rats were given an initiating dose of azoxymethane and were then randomly allocated to groups receiving diets differing in their quantity and quality of casein. The groups were examined for aberrant crypt foci and tumors in the colon. Results: Aberrant crypt foci were promoted by diets containing thermolyzed casein (180-degrees-C, 2 hours). Promotion increased with increasing level of thermolyzed casein in the diet (to 20%) and with increasing thermolysis time (to 4 hours). The number of animals with polyps and cancers was higher in the animals receiving thermolyzed protein (2 hours), 16/23 versus 9/26 (P<.05) and 10/26 versus 3/27 (P<.05), respectively. The number of aberrant crypts per focus and the number of large aberrant crypt foci were higher in the tumor-bearing animals. Conclusions: Thermolyzed casein promotes early colonic precursor lesions in a dose-dependent and thermolysis time-dependent manner; thermolyzed casein also promotes colon cancer. Implications: The promoter formed on thermolysis could be involved in colon cancers associated with diets cooked at elevated temperatures, such as can occur with high-fat diets.
引用
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页码:1026 / 1030
页数:5
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