TY - JOUR
T1 - AS601245, an anti-inflammatory JNK inhibitor, and clofibrate have a synergistic effect in inducing cell responses and in affecting the gene expression profile in CaCo-2 colon cancer cells
AU - Cerbone, Angelo
AU - Toaldo, Cristina
AU - Pizzimenti, Stefania
AU - Pettazzoni, Piergiorgio
AU - Dianzani, Chiara
AU - Minelli, Rosalba
AU - Ciamporcero, Eric
AU - Roma, Guglielmo
AU - Dianzani, Mario Umberto
AU - Canaparo, Roberto
AU - Ferretti, Carlo
AU - Barrera, Giuseppina
PY - 2012
Y1 - 2012
N2 - PPARαs are nuclear receptors highly expressed in colon cells. They can be activated by the fibrates (clofibrate, ciprofibrate etc.) used to treat hyperlipidemia. Since PPAR transcriptional activity can be negatively regulated by JNK, the inhibition of JNK activity could increase the effectiveness of PPAR ligands. We analysed the effects of AS601245 (a JNK inhibitor) and clofibrate alone or in association, on proliferation, apoptosis, differentiation and the gene expression profile of CaCo-2 human colon cancer cells. Proliferation was inhibited in a dose-dependent way by clofibrate and AS601245. Combined treatment synergistically reduced cell proliferation, cyclin D1 and PCNA expression and induced apoptosis and differentiation. Reduction of cell proliferation, accompanied by the modulation of p21 expression was observed in HepG2 cells, also. Gene expression analysis revealed that some genes were highly modulated by the combined treatment and 28 genes containing PPRE were up-regulated, while clofibrate alone was ineffective. Moreover, STAT3 signalling was strongly reduced by combined treatment. After combined treatment, the binding of PPAR to PPRE increased and paralleled with the expression of the PPAR coactivator MED1. Results demonstrate that combined treatment increases the effectiveness of both compounds and suggest a positive interaction between PPAR ligands and anti-inflammatory agents in humans.
AB - PPARαs are nuclear receptors highly expressed in colon cells. They can be activated by the fibrates (clofibrate, ciprofibrate etc.) used to treat hyperlipidemia. Since PPAR transcriptional activity can be negatively regulated by JNK, the inhibition of JNK activity could increase the effectiveness of PPAR ligands. We analysed the effects of AS601245 (a JNK inhibitor) and clofibrate alone or in association, on proliferation, apoptosis, differentiation and the gene expression profile of CaCo-2 human colon cancer cells. Proliferation was inhibited in a dose-dependent way by clofibrate and AS601245. Combined treatment synergistically reduced cell proliferation, cyclin D1 and PCNA expression and induced apoptosis and differentiation. Reduction of cell proliferation, accompanied by the modulation of p21 expression was observed in HepG2 cells, also. Gene expression analysis revealed that some genes were highly modulated by the combined treatment and 28 genes containing PPRE were up-regulated, while clofibrate alone was ineffective. Moreover, STAT3 signalling was strongly reduced by combined treatment. After combined treatment, the binding of PPAR to PPRE increased and paralleled with the expression of the PPAR coactivator MED1. Results demonstrate that combined treatment increases the effectiveness of both compounds and suggest a positive interaction between PPAR ligands and anti-inflammatory agents in humans.
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U2 - 10.1155/2012/269751
DO - 10.1155/2012/269751
M3 - Article
C2 - 22619672
AN - SCOPUS:84858320097
SN - 1687-4757
JO - PPAR Research
JF - PPAR Research
M1 - 269751
ER -