Modulatory influence of chlorophyllin on the mouse skin papillomagenesis and xenobiotic detoxication system

Abstract

The present study evaluates the modulatory potential of chlorophyllin (CHL) on the murine skin papillomagenesis pattern and its influence on the levels of biotransformation system enzymes. Topical application of CHL (100 mg/kg body weight/day) during peri-, post- or peri- and post-initiational stages of 7,12-dimethylbenz[a]anthracene (DMBA)induced papillomagenesis, significantly (P < 0.01) reduced the (i) tumor burden to 3.68, 3.56 and 3.33 (positive control value: 5.89); (ii) cumulative number of papillomas to 59, 57 and 60 (positive control value: 112); and (iii) incidence of mice bearing papillomas to 88%, 88% and 90%, respectively (positive control value 100%). CHL treatment alone or during peri-, post-, or peri- and post-initiational stages significantly elevated the glutathione S-transferase (GST) and -SH levels in the liver and skin tissue of the murine system. The potential of CHL in modulating the process of carcinogenesis is suggested by the altered levels of biotransformation system enzymes. The implications of the biochemical changes and inhibition of tumor incidence by CHL are discussed.