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Although the etiology of prostate cancer remains unknown, elevated levels of steroid hormones such as androgens and estrogens, as well as growth factors such as insulin-like growth factor-1 (IGF-1), are considered to be important risk factors. These hormones and growth factors have been shown to promote proliferation of prostate cancer cells through the activation of receptor-mediated signaling pathways. Therapeutic as well as preventive strategies have explored modulation of these pathways as potential approaches to prevent or control prostate cancer.
Bioactive food components, in particular, are increasingly being evaluated as potential prostate cancer chemopreventive agents because of their presumed safety. One such agent is resveratrol, a polyphenol (trans-3,5,4′-trihydroxystilbene) categorized as a phytoalexin, found principally in the skin of grapes, but also in peanuts and other plant species. Red wine, often mentioned as a good source of resveratrol, contains 1–10 mg of resveratrol/l (4–40 μM). Recent studies attributed a variety of health benefits to consumption of foods containing resveratrol, including protection against cancers, cardiovascular disease and aging.
Results from rodent carcinogenesis models suggest that resveratrol can inhibit initiation, promotion and progression. Moreover, molecular studies show that resveratrol possesses anticancer activities, including acting as an antioxidant, possessing anti-inflammatory properties and functioning as a weak estrogen. In vitro experiments using prostate cancer cell lines provide support for resveratrol to serve as a candidate prostate cancer preventive agent. Resveratrol has been shown to inhibit prostate cancer cell growth in culture, to inhibit DNA synthesis and to increase apoptosis in LNCaP cells, a human prostate cancer cell line.
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Chuck Reynolds
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