Pharmacological exploitation of the peroxisome proliferator-activated receptor γ agonist ciglitazone to develop a novel class of androgen receptor-ablative agents

Jian Yang, Shuo Wei, Da Sheng Wang, Yu Chieh Wang, Samuel K. Kulp, Ching Shih Chen

Research output: Contribution to journalArticlepeer-review

22 Scopus citations

Abstract

On the basis of our finding that the peroxisome proliferator-activated receptor γ (PPARγ) agonist ciglitazone at high doses was able to mediate PPARγ-independent transcriptional repression of androgen receptor (AR) in a tumor cell-specific manner, we used Δ2CG, a PPARγ-inactive analogue of ciglitazone, to conduct lead optimization to develop a novel class of AR-ablative agents. Structure-activity analysis indicates a high degree of flexibility in realigning Δ2CG's structural moieties without compromising potency in AR repression, as evidenced by the higher AR-ablative activity of the permuted isomer 9 [(Z)-5-(4-hydroxybenzylidene)-3-(1-methylcyclohexylmethyl) thiazolidine-2,4-dione]. Further modificiations of 9 gave rise to 12 [(Z)-5-(4-hydroxy-3-trifluoromethylbenzylidene)-3-(1-methylcyclohexylmethyl) thiazolidine-2,4-dione], which completely inhibited AR expression in LNCaP cells at low micromolar concentrations. This AR down-regulation led to growth inhibition in LNCaP cells through apoptosis induction. Moreover, the role of AR repression in the antiproliferative effect of compound 12 was validated by the differential inhibition of cell viability between androgen-responsive and androgen-nonresponsive cells.

Original languageEnglish
Pages (from-to)2100-2107
Number of pages8
JournalJournal of Medicinal Chemistry
Volume51
Issue number7
DOIs
StatePublished - 10 Apr 2008

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