Suppression of tumor promoter-induced oxidative events and DNA damage in vivo by sarcophytol A: a possible mechanism of antipromotion.

Abstract

Sarcophytol A (Sarp A), a nontoxic compound isolated from marine soft coral, inhibits the in vivo effects of tumor promoters. However, the mechanism of its action is unknown. Our studies show that Sarp A suppresses oxidant formation and DNA oxidation in the epidermis of SENCAR mice exposed to 12-O-tetradecanoylphorbol-13-acetate (TPA). In the short-term experiments, mice were topically pretreated with different doses of Sarp A before 6.5 nmol TPA, and the same treatment was repeated 20 h later. Sarp A significantly decreased the TPA-induced infiltration of neutrophils, the levels of myeloperoxidase in the dermis, and the formation of H2O2, cis-thymidine glycol, 8-hydroxyl-2'-deoxyguanosine, and 5-hydroxymethyl-2'-deoxyuridine in the epidermis. In the long-term studies, repeated TPA applications (3.2 nmol twice a week for 16 weeks) increased cis-thymidine glycol 2.7-fold, 5-hydroxymethyl-2'-deoxyuridine 3.4-fold, and 8-hydroxyl-2'-deoxyguanosine 3.3-fold in epidermal DNA over the basal levels. Application of 350 nmol Sarp A before each TPA treatment significantly decreased the formation of oxidized DNA bases even below those present in the control mouse skin. Histological examination showed that Sarp A also alleviated the TPA-induced inflammatory response and infiltration of phagocytes. Thus, it is possible that suppression of tumor promotion by Sarp A is due (at least in part) to its inhibitory effects on tumor promoter-mediated migration and activation of phagocytes, oxidant formation, and DNA base oxidation.

• Authors: H Wei, K Frenkel
• Journal: Cancer research (Cancer Res) Vol. 52 Issue 8 Pg. 2298-303 (Apr 15 1992) ISSN: 0008-5472 [Print] United States
• PMID: 1559232 (Publication Type: Journal Article, Research Support, Non-U.S. Gov't, Research Support, U.S. Gov't, P.H.S.)

Chemical References

• Antineoplastic Agents
• Diterpenes
• sarcophytol A
• DNA
• Hydrogen Peroxide
• Tetradecanoylphorbol Acetate

Topics

• Animals
• Antineoplastic Agents (pharmacology)
• Cell Movement (drug effects)
• DNA (drug effects, metabolism)
• DNA Damage (drug effects)
• Diterpenes (pharmacology)
• Female
• Hydrogen Peroxide (metabolism)
• Hyperplasia (chemically induced)
• Mice
• Neutrophils (drug effects)
• Oxidation-Reduction
• Skin (drug effects, pathology)
• Tetradecanoylphorbol Acetate