Abstract
Fibroblast growth factor-2 (FGF-2) is known for its mitogenic and motogenic effects on breast cancer cells. Here, we demonstrate that FGF-2 is also a potent stimulator of breast cancer cell survival, as it counteracts the apoptotic activity of the C2 ceramide analogue and various chemotherapeutic agents (5-fluorouracil, camptothecin, etoposide) in MCF-7, T47-D and BT-20 cells. The use of pharmacological inhibitors (PD98059, wortmannin, LY294002, SN50) and transfection with negative dominants (IκBm, p110(PI3K (phosphoinositide 3-kinase))*ΔK, AktND) or small interfering RNA targeted against Akt indicated that PI3K/Akt and nuclear factor-κB (NF-κB), but not p42/p44 MAP-kinases, were required to stimulate FGF-2 antiapoptotic activity. The activation of NF-κB was dependent on PI3K/Akt, and using a combination of approaches based on immunoprecipitation, Western blotting and proteomics (two-dimensional electrophoresis and mass spectrometry), we identified the beta form of IκB kinase (IKKβ) as a target of Akt signaling. The selective disruption of IKKβ using small interfering RNA induced a potent inhibition of Akt-mediated activation of NF-κB and cell survival, indicating the functional involvement of IKKβ in FGF-2 antiapoptotic signaling. Together, these results demonstrate Akt/IKKβ interaction in NF-κB pathways, thereby emphasizing the potential of these proteins as therapeutic targets in breast cancer.
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Acknowledgements
We thank J Antol for his excellent technical assistance. This work was supported by grants from the French Ministry for Research and Education, the ‘Institut Universitaire de France’ and the ‘Ligue Nationale Contre le Cancer (Comité du Nord et de la Somme)’ and the ‘Association pour la Recherche sur le Cancer’.
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Vandermoere, F., El Yazidi-Belkoura, I., Adriaenssens, E. et al. The antiapoptotic effect of fibroblast growth factor-2 is mediated through nuclear factor-κB activation induced via interaction between Akt and IκB kinase-β in breast cancer cells. Oncogene 24, 5482–5491 (2005). https://doi.org/10.1038/sj.onc.1208713
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DOI: https://doi.org/10.1038/sj.onc.1208713
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