Triptophenolide is identified
as an antiandrogen: (A) Effect of
triptophenolide on wild-type AR activity in PC-3 cells. (B) Effect
of triptophenolide on F876L AR activity in PC-3 cells. The F876L mutated
AR was activated by ENZ at 500 nM. (C) Effect of triptophenolide on
T877A AR activity in PC-3 cells. The T877A mutated AR was activated
by hydroxyflutamide at 5 μM. (D) Effect of triptophenolide on
T877A+W741C AR activity in PC-3 cells. The T877A + W741C mutated AR
was activated by both hydroxyflutamide and bicalutamide at 5 μM.
(E) Triptophenolide significantly downregulated PSA mRNA level at
500 nM and 5 μM. (F) Growth inhibitory effects of triptophenolide
in the PC-3 and LNCaP cells. Plasmids expressing ARs are transiently
transfected in PC-3 cells in dual luciferase assay. Experiments were
in triplicate. *P < 0.05, **P < 0.01, ***P < 0.001 vs DMSO group, △P < 0.05, △△P < 0.01,
△△△ P < 0.001 vs DHT group.
BIC, bicalutamide; ENZ, enzalutamide; DHT, dihydrotestosterone. All
results are shown as mean ± SD.