| In vitro: |
| Melanoma Research, 1999, 9(3):243-248. | | Cytostatic activity of coumarin metabolites and derivatives in the B16-F10 murine melanoma cell line.[Reference: WebLink] | Coumarin has antitumour effects in vivo and cytostatic effects in vitro. Its half-life in humans is short (1-1.5 h) and the monohydroxylated biotransformation products have significantly longer half-lives. One or several of these products may thus be responsible for the antitumoral effects.
METHODS AND RESULTS:
We have assayed the in vitro cytostatic activity of five monohydroxylated coumarins (3-, 4-, 6-, 7- and 8-monohydroxycoumarin), their acetates and methyl-ethers. Murine melanoma cells (cell line B16-F10) and murine fibroblasts (B82) were exposed to the test compounds at concentrations between 10 and 160 microg/ml. The cytostatic effects were estimated by reduction of the tetrazolium dye MTT. In the melanoma cells, some of the compounds inhibited growth after exposure for 1 day. In contrast, coumarin inhibited growth to a smaller extent, and only after exposure for 3 days. The most active compounds (3-acetoxycoumarin, 4-methoxycoumarin(4-Methoxycoumarine) and 6-hydroxycoumarin), as well as coumarin, were also assayed in murine fibroblasts.
CONCLUSIONS:
The cytostatic effects of 4-methoxycoumarin(4-Methoxycoumarine) and 6-hydroxycoumarin were less pronounced in fibroblasts than in melanoma cells. Our observations suggest that these compounds may have a greater therapeutic margin. |
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