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Prevention of Prostate Cancer with Oleanane Synthetic Triterpenoid CDDO-Me in the TRAMP Mouse Model of Prostate Cancer
Department of General Surgery, Henry Ford Health System, Detroit, MI 48150, USA
Department of Diagnostic Radiology, Henry Ford Health System, Detroit, MI 48150, USA
Department of Public Health Sciences, Henry Ford Health System, Detroit, MI 48150, USA
* Author to whom correspondence should be addressed.
Received: 26 May 2011; in revised form: 12 August 2011 / Accepted: 15 August 2011 / Published: 19 August 2011
Abstract: 2-Cyano-3,12-dioxooleana-1,9(11)-dien-28-oic acid (CDDO), a synthetic analog of oleanolic acid, and its C28 methyl ester derivative (CDDO-Me), have shown potent antitumorigenic activity against a wide range of cancer cell lines, including prostate cancer cells in vitro, and inhibited the development of liver and lung cancer in vivo. In the present study, we examined the efficacy of CDDO-Me in preventing the development and progression of prostate cancer in the transgenic adenocarinoma of the mouse prostate (TRAMP) model. CDDO-Me inhibited the growth of murine TRAMPC-1 prostate cancer cells by inducing apoptosis through the inhibition of antiapoptotic p-Akt, p-mTOR and NF-κB. Early intervention with CDDO-Me (7.5 mg/kg) initiated at five weeks of age for 20 wk inhibited the progression of the preneoplastic lesions (low-grade PIN and high-grade-PIN) to adenocarcinoma in the dorsolateral prostate (DLP) and ventral prostate (VP) lobes of TRAMP mice. Even delayed administration of CDDO-Me started at 12 wk of age for 12 wk inhibited the development of adenocarcimona of the prostate. Both early and late treatment with CDDO-Me inhibited the metastasis of tumor to the distant organs. Treatment with CDDO-Me inhibited the expression of prosurvival p-Akt and NF-κB in the prostate and knocking-down Akt in TRAMPC-1 tumor cells sensitized them to CDDO-Me. These findings indicated that Akt is a target for apoptoxicity in TRAMPC-1 cells in vitro and potentially a target of CDDO-Me for inhibition of prostate cancer in vivo.
Keywords: prostate cancer; chemoprevention; CDDO-Me; apoptosis; Akt/mTOR/NF-kB signaling
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Gao, X.; Deeb, D.; Liu, Y.; Arbab, A.S.; Divine, G.W.; Dulchavsky, S.A.; Gautam, S.C. Prevention of Prostate Cancer with Oleanane Synthetic Triterpenoid CDDO-Me in the TRAMP Mouse Model of Prostate Cancer. Cancers 2011, 3, 3353-3369.
Gao X, Deeb D, Liu Y, Arbab AS, Divine GW, Dulchavsky SA, Gautam SC. Prevention of Prostate Cancer with Oleanane Synthetic Triterpenoid CDDO-Me in the TRAMP Mouse Model of Prostate Cancer. Cancers. 2011; 3(3):3353-3369.
Gao, Xiaohua; Deeb, Dorrah; Liu, Yongbo; Arbab, Ali S.; Divine, George W.; Dulchavsky, Scott A.; Gautam, Subhash C. 2011. "Prevention of Prostate Cancer with Oleanane Synthetic Triterpenoid CDDO-Me in the TRAMP Mouse Model of Prostate Cancer." Cancers 3, no. 3: 3353-3369.