Glycogen synthase kinase 3β regulates cell death induced by synthetic triterpenoids

Roberta Venè, Patrizia Larghero, Giuseppe Arena, Michael B. Sporn, Adriana Albini, Francesca Tosetti

Research output: Contribution to journalArticle

31 Citations (Scopus)

Abstract

The induction of programmed cell death in premalignant or malignant cancer cells by chemopreventive agents could be a valuable tool to control prostate cancer initiation and progression. In this work, we present evidence that the C-28 methyl ester of the synthetic oleanane triterpenoid 2-cyano-3,12- dioxooleana-1,9(11)-dien-28-oic acid (CDDO-Me) induces cell death in androgen-responsive and unresponsive human prostate cancer cell lines at nanomolar and low micromolar concentrations. CDDO-Me induced caspase-3, caspase-8, and caspase-9 activation; poly(ADP-ribose) polymerase cleavage; internucleosomal DNA fragmentation; and loss of 3-(4,5-dimethylthiazol-2-yl)-2, 5-diphenyltetrazolium bromide reduction in PC3 and DU145 cells. However, caspase-3 and caspase-8 inhibition by Z-DEVD-fmk and Z-IETD-fmk, respectively, or general caspase inhibition by BOC-D-fmk or Z-VAD-fmk did not rescue loss of cell viability induced by CDDO-Me, suggesting the activation of additional caspase-independent mechanisms. Interestingly, CDDO-Me induced inactivating phosphorylation at Ser9 of glycogen synthase kinase 3β (GSK3β), a multifunctional kinase that mediates essential events promoting prostate cancer development and acquisition of androgen independence. The GSK3 inhibitor lithium chloride and, more effectively, GSK3 gene silencing sensitized PC3 and DU145 prostate cancer cells to CDDO-Me cytotoxicity. These data suggest that modulation of GSK3β activation is involved in the cell death pathway engaged by CDDO-Me in prostate cancer cells.

Original languageEnglish
Pages (from-to)6987-6996
Number of pages10
JournalCancer Research
Volume68
Issue number17
DOIs
Publication statusPublished - Sep 1 2008

Fingerprint

Glycogen Synthase Kinase 3
Cell Death
Prostatic Neoplasms
Caspase 8
Caspases
Caspase 3
Androgens
Lithium Chloride
Poly(ADP-ribose) Polymerases
Caspase 9
Gene Silencing
DNA Fragmentation
methyl 2-cyano-3,12-dioxoolean-1,9-dien-28-oate
Cell Survival
Esters
Phosphotransferases
Phosphorylation
Cell Line
Acids
Neoplasms

ASJC Scopus subject areas

  • Cancer Research
  • Oncology

Cite this

Glycogen synthase kinase 3β regulates cell death induced by synthetic triterpenoids. / Venè, Roberta; Larghero, Patrizia; Arena, Giuseppe; Sporn, Michael B.; Albini, Adriana; Tosetti, Francesca.

In: Cancer Research, Vol. 68, No. 17, 01.09.2008, p. 6987-6996.

Research output: Contribution to journalArticle

Venè, Roberta ; Larghero, Patrizia ; Arena, Giuseppe ; Sporn, Michael B. ; Albini, Adriana ; Tosetti, Francesca. / Glycogen synthase kinase 3β regulates cell death induced by synthetic triterpenoids. In: Cancer Research. 2008 ; Vol. 68, No. 17. pp. 6987-6996.
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