alexa PPARgamma-independent antitumor effects of thiazolidinediones.
Molecular Biology

Molecular Biology

Journal of Cytology & Histology

Author(s): Wei S, Yang J, Lee SL, Kulp SK, Chen CS

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Abstract The thiazolidinedione (TZD) family of PPARgamma agonists, especially troglitazone and ciglitazone, induce cell cycle arrest, differentiation, and apoptosis in cancer cells. Mounting evidence indicates that TZDs interfere with multiple signaling mechanisms independently of PPARgamma activation, which affect many aspects of cellular functions governing cell cycle progression and survival of cancer cells. Here, we review the "off-target" mechanisms that underlie the antitumor effects of TZDs with emphasis on three key pathways, namely, inhibition of Bcl-2/Bcl-xL function, proteasomal degradation of cell cycle- and apoptosis-regulatory proteins, and transcriptional repression of androgen receptor (AR) through Sp1 degradation. Relative to tumor cells, nonmalignant cells are resistant to these PPARgamma-independent antitumor effects, which underscores the translational potential of these agents. Furthermore, dissociation of these antitumor effects from their PPARgamma agonist activity provides a rationale for using TZDs as scaffolds for lead optimization to develop a novel class of antitumor agents with a unique mode of mechanism.
This article was published in Cancer Lett and referenced in Journal of Cytology & Histology

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