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- W2065619148 abstract "Chemoprevention of free radical-mediated diseases including cancer by natural products is an emerging discipline due to its wider applicability and acceptance. The present study deals with the chemopreventive effect of Salix caprea against phorbol ester-induced oxidative stress and tumor promotion in murine skin. In the present investigation, it was observed that a single application of 12-O-tetradecanoyl-13-phorbol acetate (TPA) (20 nmol/0.2 ml acetone/animal) caused a significant (P<0.05) depletion of cutaneous antioxidants viz., glutathione, glutathione reductase, glutathione peroxidase, catalase and phase II drug metabolizing enzymes viz., glutathione-S-transferase, quinone reductase. An increase in the hydrogen peroxide generation and protein oxidation (measured in terms of protein carbonyl content) was also observed with a single application of TPA. However, the pretreatment of animals with different doses of Salix caprea (0.5, 1.0 and 1.5 mg/kg/0.2 ml acetone) caused a significant recovery in the TPA-mediated depletion in antioxidant levels. The pretreatment of animals with Salix caprea was observed to inhibit the TPA-mediated depletion in phase II enzymes. It was also observed that Salix caprea reversed the TPA-mediated depletion in the activity of phase II enzymes that is an important characteristic of cancer chemopreventive agents. Phorbol esters are known to induce the tumor promotion by increasing rate of DNA synthesis, ornithine decarboxylase activity (ODC), and xanthine oxidase activity. In the present investigation, it was observed that the pretreatment of animals with Salix caprea caused a significant (P<0.05) depletion in the TPA-induced DNA synthesis, ODC and xanthine oxidase activity in mice skin. Salix caprea significantly reduced the tumor promotion in mice skin when tested in two-stage chemical carcinogenesis model. It was observed to inhibit significantly (P<0.05) the 7,12-dimethyl benz[a] anthracene (DMBA)-initiated phorbol ester promoted skin carcinogenesis. It was concluded from the results that Salix caprea is an effective antioxidant and chemopreventive agent against phorbol ester-induced tumor promotion." @default.
- W2065619148 created "2016-06-24" @default.
- W2065619148 creator A5019925199 @default.
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- W2065619148 date "2004-04-01" @default.
- W2065619148 modified "2023-10-18" @default.
- W2065619148 title "Salix caprea inhibits skin carcinogenesis in murine skin: inhibition of oxidative stress, ornithine decarboxylase activity and DNA synthesis" @default.
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- W2065619148 doi "https://doi.org/10.1016/j.jep.2003.12.028" @default.
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