Abstract
Cyclin-dependent kinases CDK4 and CDK6 are essential for the control of the cell cycle through the G1 phase. Aberrant expression of CDK4 and CDK6 is a hallmark of cancer, which would suggest that CDK4 and CDK6 are attractive targets for cancer therapy. Herein, we report that calcein AM (the calcein acetoxymethyl-ester) is a potent specific inhibitor of CDK4 and CDK6 in HCT116 human colon adenocarcinoma cells, inhibiting retinoblastoma protein (pRb) phosphorylation and inducing cell cycle arrest in the G1 phase. The metabolic effects of calcein AM on HCT116 cells were also evaluated and the flux between the oxidative and non-oxidative branches of the pentose phosphate pathway was significantly altered. To elucidate whether these metabolic changes were due to the inhibition of CDK4 and CDK6, we also characterized the metabolic profile of a CDK4, CDK6 and CDK2 triple knockout of mouse embryonic fibroblasts. The results show that the metabolic profile associated with the depletion of CDK4, CDK6 and CDK2 coincides with the metabolic changes induced by calcein AM on HCT116 cells, thus confirming that the inhibition of CDK4 and CDK6 disrupts the balance between the oxidative and non-oxidative branches of the pentose phosphate pathway. Taken together, these results indicate that low doses of calcein can halt cell division and kill tumor cells. Thus, selective inhibition of CDK4 and CDK6 may be of greater pharmacological interest, since inhibitors of these kinases affect both cell cycle progression and the robust metabolic profile of tumors.
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Abbreviations
- Calcein AM:
-
Calcein acetoxymethyl-ester
- CDK:
-
Cyclin-dependent kinase
- DMEM:
-
Dulbecco’s modified eagle medium
- FCS:
-
Fetal calf serum
- Ct MEF:
-
Mouse embryonic fibroblast
- PBS:
-
Phosphate buffer saline
- PPP:
-
Pentose phosphate pathway
- pRb:
-
Retinoblastoma protein
- TKO MEF:
-
Mouse embryonic fibroblast knockout for CDK4, CDK6 and CDK2
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Acknowledgments
The authors thank Mrs Ursula Valls for her technical support in the experiments and Dr David Santamaria for his help in MEF procedures. MEF cells were a generous gift from Dr Mariano Barbacid, CNIO-Madrid (Spain). This study was supported by the projects SAF2008-00164 (to MC) and SAF2007-60491 (to NA) and by RD06/0020/0046 (to MC), RD06/0020/0010 (to OB) from Red Temática de Investigación Cooperativa en Cáncer (RTICC), Instituto de Salud Carlos III, all of them funded by the Ministerio de Ciencia e Innovación-Spanish government and European Regional Development Funds (ERDF) “Una manera de hacer Europa”. It has also received financial support from the European Union-funded project ETHERPATHS (FP7-KBBE-222639) (http://www.etherpaths.org/) and from the Agència de Gestió d’Ajuts Universitaris i de Recerca (AGAUR)-Generalitat de Catalunya (2009SGR01308 and predoctoral fellowship of M.Z.). Mass spectrometry facility was supported by NIH grants to WNP Lee from UCLA Center of Excellence (PO1 AT003960-01) and from Harbor-UCLA GCRC (MO1 RR00425-33). MC acknowledges the support received through the prize “ICREA Academia” for excellence in research, funded by ICREA foundation-Generalitat de Catalunya.
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Miriam Zanuy and Antonio Ramos-Montoya contributed equally to this work.
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Zanuy, M., Ramos-Montoya, A., Villacañas, O. et al. Cyclin-dependent kinases 4 and 6 control tumor progression and direct glucose oxidation in the pentose cycle. Metabolomics 8, 454–464 (2012). https://doi.org/10.1007/s11306-011-0328-x
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DOI: https://doi.org/10.1007/s11306-011-0328-x