Hirsutenone in Alnus extract inhibits akt activity and suppresses prostate cancer cell proliferation

Soouk Kang, Jong Eun Kim, Yan Li, Sung Keun Jung, Nu Ry Song, N. R. Thimmegowda, Bo Yeon Kim, Hyong Joo Lee, Ann M. Bode, Zigang Dong, Ki Won Lee

Research output: Contribution to journalArticle

5 Scopus citations

Abstract

Although specific compounds found in some East Asian traditional medicines have been shown to exhibit bioactive properties, their molecular mechanisms of action remain elusive. The bark of the Alnus species has been used for the treatment of various pathological conditions including hemorrhage, alcoholism, fever, diarrhea, skin diseases, inflammation, and cancer in East Asia for centuries. In this study, we show that hirsutenone, a bioactive compound in Alnus japonica, exhibits anti-cancer effects against prostate cancer through a direct physical inhibition of Akt1/2. Hirsutenone suppressed anchorage-dependent and independent cell growth of PC3 and LNCaP human prostate cancer cells. Annexin V and Propidium iodide (PI) staining results demonstrated that hirsutenone strongly induces apoptotic cell death in both PC3 and LNCaP cells. Furthermore, treatment of hirsutenone attenuated phosphorylation of mammalian target of rapamycin (mTOR), a downstream substrate of Akt, without affecting Akt phosphorylation. Kinase and pull-down assay results clearly show that hirsutenone inhibits Akt1 and 2 by direct binding in an adenosine triphosphate (ATP)-noncompetitive manner in vitro and ex vivo. Our results show that hirsutenone suppresses human prostate cancer by targeting Akt1 and 2 as a key component to explain for anti-cancer activity of Alnus species.

Original languageEnglish (US)
Pages (from-to)1354-1362
Number of pages9
JournalMolecular Carcinogenesis
Volume54
Issue number11
DOIs
StatePublished - Nov 2015

Keywords

  • Akt
  • Hirsutenone
  • Proliferation
  • Prostate cancer

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    Kang, S., Kim, J. E., Li, Y., Jung, S. K., Song, N. R., Thimmegowda, N. R., Kim, B. Y., Lee, H. J., Bode, A. M., Dong, Z., & Lee, K. W. (2015). Hirsutenone in Alnus extract inhibits akt activity and suppresses prostate cancer cell proliferation. Molecular Carcinogenesis, 54(11), 1354-1362. https://doi.org/10.1002/mc.22211