Diterpenes from Cryptomeria japonica Inhibit Androgen Receptor Transcriptional Activity in Prostate Cancer Cells

Abstract

We identified eight diterpenes from Cryptomeria japonica (Taxodiaceae), which inhibit the activity of the androgen receptor (AR) in human prostate cancer (PCa) 22Rv1-derived 103E cells. The compounds 6,12-dihydroxyabieta-5,8,11,13-tetraen-7-one (2), sugiol (3), ferruginol (4), and 5-epixanthoperol (7) have near 100 % AR inhibition efficacy at concentrations of 10, 5, 25, and 25 μM, respectively. Because these compounds have very similar structures, analysis of their differential activity may aid in the design of inhibitors for PCa treatment. AR:androgen receptor Nil:nilutamide PCa:prostate cancer PSA:prostate specific antigen