Posted by Chantel M. Contributed by US National
Library of Medicine National Institutes of Health
In the study to assess the effect of soy isoflavones on the biochemical events associated with tumor promotion in mouse skin, posted in US National Library of Medicine National Institutes of Health, indicated that 12-O-tetradecanoyl phorbol-13-acetate (TPA), a well-known tumor promoter
on topical application depletes the reduced glutathione content (GSH)
and down regulates the activities of its metabolizing enzyme,
glutathione-S-transferase (GST) and the activities of antioxidant
enzymes. However, the ornithine decarboxylase (ODC) activity and
unscheduled DNA synthesis are elevated on single topical application of
TPA to the dorsal cutaneous portions of the mice. Topical applications
of soy isoflavones,
half-an-hour prior to the application of TPA prevented the induction of
ODC activity and DNA synthesis mediated by TPA (p < 0.01). The
content of GSH, GST and antioxidant enzymes (p < 0.05) was also
recovered significantly by soy isoflavones in a dose dependent manner.
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