Induction of thymidine kinase in mouse skin exposed to 12-O-tetradecanoylphorbol-13-acetate

Design of topical nanostructured lipid carrier of silymarin and its effect on 7,12-dimethylbenz[a]anthracene (DMBA) induced cellular differentiation in mouse skin

Effect of silymarin NLC on DMBA induced cell changes in mouse skin.

Effects of C-Phycocyanin on the representative genes of tumor development in mouse skin exposed to 12-O-tetradecanoyl-phorbol-13-acetate

C-Phycocyanin (C-PC), a biliprotein from the sea weed, has been shown to have the beneficial effects like antioxidant, anti-inflammatory, neuroprotective, and hepatoprotective properties and is used as food supplement. We are showing the effect of C-Phycocyanin on the early events altered by tumor promoter. TPA induced the expression of critical events of tumorigenesis like ornithine decarboxylase, cyclooxygenase-2, interleukin-6 and pSTAT3 in mouse skin after 5h of application, whereas expression of transglutaminase2 was decreased at this time point. This TPA-caused altered expression of genes was prevented in presence of C-Phycocyanin. This prevention by C-Phycocyanin appeared to be dependent on the dose of C-Phycocyanin used. The results are useful for the detailed study on the preventive effect of C-Phycocyanin on TPA induced tumor promotion.

Suppression of DMBA-induced mouse skin tumor development by inositol hexaphosphate and its mode of action

Inositol hexaphosphate (IP6) or phytic acid, contained in most mammalian cells, has been shown to have anticancer and anti-cell-proliferative effects in several experimental models of carcinogenesis. We investigated the effect of topical application of IP6 on 7,12-dimethylbenzanthracene (DMBA)-induced complete carcinogenesis and on selective critical events of proliferation, differentiation, or apoptosis after DMBA exposure. IP6 inhibited skin tumor development significantly in a dose-dependent manner. IP6 induced the DMBA-inhibited transglutaminase activity. DNA synthesis, as determined by [3H]thymidine incorporation, was suppressed by IP6 in a dose-dependent manner. IP6 also inhibited thymidine kinase enzyme, which is responsible for [3H]thymidine incorporation into DNA. Our results show that topical application of IP6 inhibits DMBA-induced mouse skin tumor development and that IP6 exerts its tumor inhibitory effect probably by modulating proliferation, differentiation, or apoptosis. It seems that IP6 is an effective and potential chemopreventive agent for management of skin tumorigenesis.