Abstract
Purpose
To test whether tanshinones inhibit prostate cancer (PCa) growth at least in part through inhibiting androgen receptor (AR) signaling.
Methods
We evaluated cell growth, survival and AR signaling parameters of PCa cells after exposure to tanshinones in in vitro models. We also tested the in vivo inhibitory efficacy of tanshinone IIA (TIIA) against LNCaP xenograft model in athymic nude mice.
Results
For androgen-dependent LNCaP cells, a colony growth assay showed strong inhibitory potency following the order of TIIA≈cryptotanshinone>tanshinone I, being 10–30 folds higher than Casodex (racemic). TIIA inhibited growth of LNCaP cells more than several androgen-independent PCa cell lines. All 3 tested tanshinones were devoid of AR agonist activity under castrate condition. Mechanistically, tanshinones inhibited AR nuclear translocation within 2 h, decreased protein and mRNA abundance of AR and its target prostate-specific antigen within 12 h, and stimulated proteosomal degradation of AR. Oral administration of TIIA (25 mg/kg, once daily) retarded LNCaP xenograft growth and down-regulated tumor AR abundance in athymic nude mice.
Conclusion
AR targeting action of tanshinones was distinct from Casodex and contributed to prostate cancer growth suppression in vitro and in vivo.
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Abbreviations
- AR:
-
androgen receptor
- ATCC:
-
American type culture collection
- Cas:
-
Casodex
- cPARP:
-
cleaved poly (ADP)-ribose polymerase
- CT:
-
cryptotanshinone
- DMSO:
-
dimethylsulfoxide
- Mib:
-
mibolerone
- PCa:
-
prostate cancer
- PSA:
-
prostate-specific antigen
- TI:
-
tanshinone I
- TIIA:
-
tanshinone IIA
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Acknowledgments & Disclosures
This work was supported, in part, by Hormel Foundation, NIH grant CA136953, Korean Medical Research Center (MRC) grant (No. 2009-0063466) and TTUHSC School of Pharmacy startup fund. We thank Mr. Todd Schuster at Hormel Institute for help with flow cytometric analyses.
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Yong Zhang, Suk-Hyun Won and Cheng Jiang contributed equally to this paper as co-first authors
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Zhang, Y., Won, SH., Jiang, C. et al. Tanshinones from Chinese Medicinal Herb Danshen (Salvia miltiorrhiza Bunge) Suppress Prostate Cancer Growth and Androgen Receptor Signaling. Pharm Res 29, 1595–1608 (2012). https://doi.org/10.1007/s11095-012-0670-3
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DOI: https://doi.org/10.1007/s11095-012-0670-3