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      저자 : Teodora Mocan (검색결과 1 건)
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        Photoprotective Effects of Two Natural Products on Ultraviolet B–Induced Oxidative Stress and Apoptosis in SKH-1 Mouse Skin

        Adriana Filip,Doina Daicoviciu,Simona Clichici,Teodora Mocan,Adriana Muresan,Ion Dan Postescu 한국식품영양과학회 2011 Journal of medicinal food Vol.14 No.7

        Solar ultraviolet radiation (UV) is the major cause of nonmelanoma skin cancer in humans. Photochemoprevention with natural products represents a simple but very effective strategy for the management of cutaneous neoplasia. We studied the photoprotective activity of Calluna vulgaris and red grape seed (Vitis vinifera L, Burgund Mare variety [BM]) extracts in vivo in an SKH-1 hairless mice skin model. Fifty 8-week-old female SKH-1 hairless mice were randomly divided into 5 groups (n = 10 each): controls, UVB-irradiated, C. vulgaris plus UVB–irradiated, BM plus UVB–irradiated, and epigallocatechin gallate (EGCG) plus UVB–irradiated. A dose of 4 mg/mouse per ㎠ of skin area for both extracts was topically applied to the mice 30 minutes before a single-dose (240 mJ/㎠) UVB exposure. EGCG dissolved in phosphate-buffered saline (pH 6.6; 0.067 M) was administered at 2 mg/mouse per ㎠. Glutathione peroxidase and catalase activities, reduced glutathione (GSH), malondialdehyde, nitric oxide, and caspase 3 activity were determined in skin homogenates 24 hours after irradiation. A single dose of UVB increased GSH levels and glutathione peroxidase activity in the exposed skin. C. vulgaris and BM pretreatment significantly decreased GSH formation and glutathione peroxidase activity (P < .001) and inhibited UVB-induced lipid peroxidation (P < .0001) and nitric oxide production (C. vulgaris: P < .06). Topical treatments with C. vulgaris and particularly BM extracts (P < .002) significantly reduced caspase 3 activity, indicating that the cells were protected against apoptosis. These results suggest that C. vulgaris and BM extracts might be chemopreventive candidates for reducing UV-induced risk for skin cancer.

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