Abstract
The insulin-like growth factor-1 (IGF-1) signaling pathway is strongly associated with the risk of various cancers, and its inhibition has emerged as a potent anticancer strategy. Accumulating evidence from in vitro studies has shown that curcumin is a potent inhibitor of the IGF-1 signaling pathway. However, direct evidence that curcumin modulates IGF-1-induced tumorigenesis in a physiological system has not been reported. Therefore, in this study, we assessed the anticarcinogenic activity of curcumin on skin cancer by using BK5.IGF-1 transgenic (Tg) mice that overexpress IGF-1 in the skin epidermis. In 7,12-dimethylbenz(a)anthracene (DMBA)-tetradecanoyl phorbol-13-acetate (TPA) two-stage skin carcinogenesis, a curcumin diet (0.02% wt/wt) fed for 14 wk remarkably reduced mouse skin tumor multiplicity by 53%, epidermal hyperplasia and proliferation compared to the control diet group. TPA-induced phosphorylation of Akt, S6 kinase (S6K), and eukaryotic translation initiation factor 4E-binding protein 1 (4EBP1) in mouse skin was lower in the curcumin group than in the control group. Curcumin treatment inhibited IGF-1-induced phosphorylation of the IGF-1 receptor, insulin receptor substrate-1, Akt, S6K, and 4EBP1 in the mouse keratinocyte cell line, C50 in a dose-dependent manner. Taken together, these data suggest that curcumin exerts significant anticarcinogenic activity in skin cancer through the inhibition of IGF-1 signaling.
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