Acceleration of papilloma growth in mice fed high-fat diets during promotion of two-stage skin carcinogenesis.
The effect of feeding a high-fat diet during the promotion phase of skin tumorigenesis was assessed in SENCAR mice. Tumors were initiated on the backs of mice by application of 10 nmol 7,12-dimethylbenz[a]anthracene (DMBA); the tumors were then promoted beginning one week later with twice weekly treatments of 2 micrograms 12-O-tetradecanoylphorbol-13-acetate (TPA) each in 0.2 ml acetone. Control diet containing 5% corn oil was fed from four weeks before until one week after DMBA treatment in all groups. A high-fat diet (24.6% corn oil) was fed from one week after DMBA treatment; the other groups continued on the control diet. Mice were fed ad libitum, and those given the high-fat diet consumed more calories early in the study than the controls did. Treatment with TPA increased calorie consumption throughout the study. Body weights were elevated in mice fed high-fat diets and reduced by TPA treatment. The average number of papillomas per mouse did not differ between the low- and high-fat groups, but papillomas grew more rapidly on the mice fed a high-fat diet than those fed a low-fat diet. The feeding of a high-fat diet following DMBA treatment, in the absence of TPA administration, did not result in promotion of skin tumors. Therefore, a high-fat diet acted as a copromoter of skin tumors in SENCAR mice.
Birt
D F
DF
Eppley Institute for Research in Cancer and Allied Diseases, University of Nebraska Medical Center, Omaha.
Pelling
J C
JC
Tibbels
M G
MG
Schweickert
L
L
D015127:9,10-Dimethyl-1,2-benzanthracene / Q000633:toxicity*; D000818:Animals; D001835:Body Weight; D003043:Cocarcinogenesis; D004041:Dietary Fats / Q000008:administration & dosage*; D005260:Female; D051379:Mice; D010212:Papilloma / Q000139:chemically induced* / Q000473:pathology; D012878:Skin Neoplasms / Q000139:chemically induced* / Q000473:pathology; D013755:Tetradecanoylphorbol Acetate / Q000633:toxicity*
D004041:Dietary Fats; D015127:9,10-Dimethyl-1,2-benzanthracene; D013755:Tetradecanoylphorbol Acetate