Combination therapy of antiandrogen and XIAP inhibitor for treating advanced prostate cancer - Abstract

PURPOSE:Overexpression of the androgen receptor (AR) and anti-apoptotic genes including X-linked inhibitor of apoptosis protein (XIAP) provide tumors with a proliferative advantage.

Therefore, our objective was to determine whether novel antiandrogen (CBDIV17) and XIAP inhibitor based combination therapy can treat advanced prostate cancer.

METHODS: CBDIV17 and embelin-6g were synthesized and their effect on cell proliferation, apoptosis, cell cycle and AR and XIAP gene silencing determined.

RESULTS: CBDIV17 was more potent than bicalutamide and inhibited proliferation of C4-2 and LNCaP cells, IC(50) for CBDIV17 was ∼12 μM and ∼21 μM in LNCaP and C4-2 cells, respectively, whereas bicalutamide had IC(50) of ∼46 μM in LNCaP cells and minimal effect in C4-2 cells. CBDIV17 induced apoptosis more effectively compared to bicalutamide and significantly inhibited DNA replication. Combination of CBDIV17 and embelin resulted in supra-additive antiproliferative and apoptotic effects. Embelin downregulated AR expression and decreased androgen-mediated AR phosphorylation at Ser(81). These hydrophobic drugs were solubilized using micelles prepared with polyethylene glycol-b-poly (carbonate-co-lactide) (PEG-b-p(CB-co-LA)) copolymer. Combination therapy inhibited prostate tumor growth more effectively compared to control or monotherapy in vivo.

CONCLUSIONS: Our results demonstrated that CBDIV17 in combination with embelin can potentially treat advanced prostate cancer.

Written by:
Danquah M, Duke CB 3rd, Patil R, Miller DD, Mahato RI. Are you the author?
University of Tennessee Health Science Center, Department of Pharmaceutical Sciences, 19 South Manassas, CRB RM 226, Memphis, 38103-3308, Tennessee, USA.

Reference: Pharm Res. 2012 Mar 27. Epub ahead of print.
doi: 10.1007/s11095-012-0737-1

PubMed Abstract
PMID: 22451249 Prostate Cancer Section