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Gomisin A inhibits tumor promotion by 12-O-tetradecanoylphorbol-13- acetate in two-stage carcinogenesis in mouse skin.

Author

Yasukawa K, Ikeya Y , Mitsuhashi H

Date

1992

Journal

Oncology

Abstract

Gomisin A, isolated from the fruits of Schisandra chinensis, is one of the dibenzocyclooctadiene lignans. Application of 12-O- tetradecanoylphorbol-13-acetate (TPA, 1 microgram/ear), a tumor- promoting agent, to the ears of mice induces inflammation. Among seven dibenzocyclooctadiene lignans assayed, gomisin A, gomisin J, and wuweizisu C inhibited the inflammatory activity induced by TPA in mice. The ED50 of these compounds for TPA-induced inflammation was 1.4-4.4 mumol. Gomisin A, with an ED50 of 1.4 mumol, showed the strongest inhibitory effect. Furthermore, at 5 mumol/mouse, it markedly suppressed the promotion effect of TPA (2.5 micrograms/mouse) on skin tumor formation in mice following initiation with 7,12-dimethylbenz[a]anthracene (50 micrograms/mouse). It is assumed that the inhibition of tumor promotion by gomisin A is due to its anti-inflammatory activity.

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