Title : Polymeric black tea polyphenols inhibit mouse skin chemical carcinogenesis by decreasing cell proliferation.

Pub. Date : 2008 Jun

PMID : 18400024






6 Functional Relationships(s)
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1 MATERIALS AND METHODS: Effect of PBP pre-treatments on 12-O-tetradecanoylphorbol-13-acetate (TPA) promoted skin papillomas was studied in 7,12-dimethylbenz(a)anthracene initiated mice over 40 weeks. Tetradecanoylphorbol Acetate phosphatidylethanolamine binding protein 1 Mus musculus
2 MATERIALS AND METHODS: Effect of PBP pre-treatments on 12-O-tetradecanoylphorbol-13-acetate (TPA) promoted skin papillomas was studied in 7,12-dimethylbenz(a)anthracene initiated mice over 40 weeks. Tetradecanoylphorbol Acetate phosphatidylethanolamine binding protein 1 Mus musculus
3 Most PBP fractions decreased TPA-induced cell proliferation by decreasing activation of signalling kinases (c-Jun N-terminal protein kinase, extracellular signal-regulated protein kinase, p38 protein kinase and Akt), transcription factors (activator protein-1 and nuclear factor kappa B) and inflammatory protein (cyclooxygenase 2). Tetradecanoylphorbol Acetate phosphatidylethanolamine binding protein 1 Mus musculus
4 TPA-induced epidermal cell apoptosis was also decreased by pre-treatment with most PBP fractions. Tetradecanoylphorbol Acetate phosphatidylethanolamine binding protein 1 Mus musculus
5 Higher levels of p53 and p21 in skin cells pre-treated with PBP fractions followed by TPA treatment as compared to only TPA-treated animals suggested possible activation of a cell cycle checkpoint. Tetradecanoylphorbol Acetate phosphatidylethanolamine binding protein 1 Mus musculus
6 In conclusion, the protective effects of PBP fractions could be attributed to inhibition of TPA-induced cellular proliferation. Tetradecanoylphorbol Acetate phosphatidylethanolamine binding protein 1 Mus musculus