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Abstract
The effect of fish oil (FO, given in the form of MaxEPA) rich in n-3 fatty acids and
evening primrose oil (EPO) rich in n-6 fatty acids on two-stage skin carcinogenesis
in mice was studied. Both FO and EPO inhibited the papilloma formation to a significant
degree only during the promotion stage which was associated with an increase in lipid
peroxidation. Both FO and EPO inhibited the binding of benzo(a)-pyrene to skin cell
DNA suggesting that this could be one of the mechanism(s) by which these oils could
be preventing papilloma development. Neither EPO nor FO influenced epidermal cell
proliferation. In the FO group, LA (linoleic acid), AA (arachidonic acid) and DHA
(docosahexaenoic acid) were increased, whereas in the EPO group a significant increase
in the AA content was noted. No specific changes in the fatty acid pattern were observed
in any of the groups that could be attributed to the papilloma incidence. These results
suggest that FO and EPO can influence papilloma formation which can be attributed,
at least in part, to their ability to prevent benzo(a)pyrene binding to DNA and to
an increase the lipid peroxidation process.
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Article info
Publication history
Accepted:
December 23,
1997
Received:
October 22,
1997
Identification
Copyright
© 1998 Published by Elsevier Inc.