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Effects of sorafenib on energy metabolism in breast cancer cells: role of AMPK–mTORC1 signaling

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Abstract

In this study, we investigated the effects and the underlying molecular mechanisms of the multi-kinase inhibitor sorafenib in a panel of breast cancer cell lines. Sorafenib inhibited cell proliferation and induced apoptosis through the mitochondrial pathway. These effects were neither correlated with modulation of MAPK and AKT pathways nor dependent on the ERα status. Sorafenib promoted an early perturbation of mitochondrial function, inducing a deep depolarization of mitochondrial membrane, associated with drop of intracellular ATP levels and increase of ROS generation. As a response to this stress condition, the energy sensor AMPK was rapidly activated in all the cell lines analyzed. In MCF-7 and SKBR3 cells, AMPK enhanced glucose uptake by up-regulating the expression of GLUT-1 glucose transporter, as also demonstrated by AMPKα1 RNA interference, and stimulated aerobic glycolysis thus increasing lactate production. Moreover, the GLUT-1 inhibitor fasentin blocked sorafenib-induced glucose uptake and potentiated its cytotoxic activity in SKBR3 cells. Persistent activation of AMPK by sorafenib finally led to the impairment of glucose metabolism both in MCF-7 and SKBR3 cells as well as in the highly glycolytic MDA-MB-231 cells, resulting in cell death. This previously unrecognized long-term effect of sorafenib was mediated by AMPK-dependent inhibition of the mTORC1 pathway. Suppression of mTORC1 activity was sufficient for sorafenib to hinder glucose utilization in breast cancer cells, as demonstrated by the observation that the mTORC1 inhibitor rapamycin induced a comparable down-regulation of GLUT-1 expression and glucose uptake. The key role of AMPK-dependent inhibition of mTORC1 in sorafenib mechanisms of action was confirmed by AMPKα1 silencing, which restored mTORC1 activity conferring a significant protection from cell death. This study provides insights into the molecular mechanisms driving sorafenib anti-tumoral activity in breast cancer, and supports the need for going on with clinical trials aimed at proving the efficacy of sorafenib for breast cancer treatment.

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Acknowledgments

We thank Bayer HealthCare Pharmaceuticals for providing sorafenib and A.VO.PRO.RI.T., Parma, Italy for its support.

Conflict of interest

The authors declare that they have no conflict of interest.

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Authors and Affiliations

  1. Department of Clinical and Experimental Medicine, University of Parma, Via Volturno, 39, Parma, 43125, Italy

    Claudia Fumarola, Cristina Caffarra, Silvia La Monica, Maricla Galetti, Roberta R. Alfieri, Andrea Cavazzoni, Elena Galvani, Pier Giorgio Petronini & Mara A. Bonelli

  2. Unità di Patologia Mammaria-Breast Cancer Unit, Istituti Ospitalieri di Cremona, Cremona, Italy

    Daniele Generali

  3. Centro di Medicina Molecolare, Istituti Ospitalieri di Cremona, Cremona, Italy

    Daniele Generali

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  1. Claudia Fumarola
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  2. Cristina Caffarra
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  3. Silvia La Monica
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  4. Maricla Galetti
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  5. Roberta R. Alfieri
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  9. Pier Giorgio Petronini
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Correspondence to Claudia Fumarola.

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Fumarola, C., Caffarra, C., La Monica, S. et al. Effects of sorafenib on energy metabolism in breast cancer cells: role of AMPK–mTORC1 signaling. Breast Cancer Res Treat 141, 67–78 (2013). https://doi.org/10.1007/s10549-013-2668-x

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