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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Slaga, T. J. Patterson, E. Yuspa, S. H. Hennings, H. Lichti, U. Ben, T. |
| Abstract | 12-O-Tetradecanoyl phorbol-13-acetate (TPA), a tumor promoter, stimulates DNA synthesis in mouse epidermal cells in vivo and in vitro. This response appears to be mediated through polyamine metabolism because ornithine decarboxylase (L-ornithine carboxy-lyase, EC 4.1.1.17)activity is markedly increased shortly after promoter exposure and this induction varies in magnitude according to dose and promoter potency of a series of phorbol esters. In vitro, exogenous putrescine (0.01-10 mM) results in a dose-related increase and prolongation of promoter-stimulated DNA DNA synthesis, a phenomenon noted in other systems of polyamine-mediated growth stimulation. The anti-inflammatory steroid fluocinolone acetonide (FA), an inhibitor of tumor promotion, prevents TPA stimulation of epidermal proliferation in vivo and in vitro. In vitro, FA most effectively prevents stimulation of DNA synthesis when applied is not required. Paradoxially, FA potentiates the increase in ornithine decarboxylase activity after TPA administeration both in vivo and in vitro. Furthermore, the inhibition of TPA-stimulated DNA synthesis by FA in vitro can be reversed by exogenous putrescine. These results suggestthat FA exerts its antipromotion effect by reducing the sensitivity of the cell to polyamines or by reducing intracellular polyamine levels. |
| ISSN | 00278424 |
| e-ISSN | 10916490 |
| Journal | Proceedings of the National Academy of Sciences of the United States of America |
| Issue Number | 9 |
| Volume Number | 74 |
| Language | English |
| Publisher | National Academy of Sciences |
| Publisher Date | 1977-11-01 |
| Publisher Place | United States |
| Access Restriction | Open |
| Subject Keyword | Carboxy-Lyases Metabolism DNA Biosynthesis Fluocinolone Acetonide Pharmacology Ornithine Decarboxylase Skin Animals Cells, Cultured DNA Replication Drug Effects Enzyme Activation Kinetics Mice Putrescine Multidisciplinary |
| Content Type | Text |
| Resource Type | Article |
| Subject | Multidisciplinary |
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