Abstract
Restricting the food intake of laboratory mice and rats markedly reduces the incidence of spontaneous and experimentally induced cancers. Using the two-stage skin tumorigenesis model in CD-1 mice, we report now that food restriction suppresses 12-O-tetradecanoylphorbol-13-acetate (TPA) stimulation of epidermal [3H]thymidine incorporation as well as TPA promotion of skin papillomas, whereas adrenalectomy completely reverses the inhibition in [3H]thymidine incorporation and tumor development. These results suggest that the adrenal gland may play an important role in mediating the tumor inhibitory effect of food restriction.
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