MEKs/ERKs inhibitor U0126 increases the radiosensitivity of rhabdomyosarcoma cells in vitro and in vivo by down regulating growth and DNA repair signals
| Autor: | Richard G. Pestell, L. Polidoro, Vladimir M. Popov, Claudio Festuccia, Giovanni Luca Gravina, P. Bonfili, Vincenzo Tombolini, Francesco Marampon, Carmela Ciccarelli, Mario Di Staso, Bianca M. Zani, Agnese Di Rocco, Caterina Fardella |
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| Jazyk: | angličtina |
| Rok vydání: | 2011 |
| Předmět: |
MAPK/ERK pathway
Cancer Research Radiation-Sensitizing Agents DNA Repair Down-Regulation Mice Nude Biology Article Mice Cell Line Tumor Nitriles Rhabdomyosarcoma medicine Butadienes Animals Humans Radiosensitivity Enzyme Inhibitors Mitogen-Activated Protein Kinase Kinases Kinase Cell growth medicine.disease Combined Modality Therapy Xenograft Model Antitumor Assays Oncology Tumor progression Cancer cell Immunology Cancer research Female Embryonal rhabdomyosarcoma Signal Transduction |
| Popis: | Multimodal treatment has improved the outcome of many solid tumors, and in some cases the use of radiosensitizers has significantly contributed to this gain. Activation of the extracellular signaling kinase pathway (MEK/ERK) generally results in stimulation of cell growth and confers a survival advantage playing the major role in human cancer. The potential involvement of this pathway in cellular radiosensitivity remains unclear. We previously reported that the disruption of c-Myc through MEK/ERK inhibition blocks the expression of the transformed phenotype; affects in vitro and in vivo growth and angiogenic signaling; and induces myogenic differentiation in the embryonal rhabdomyosarcoma (ERMS) cell lines (RD). This study was designed to examine whether the ERK pathway affects intrinsic radiosensitivity of rhabdomyosarcoma cancer cells. Exponentially growing human ERMS, RD, xenograft-derived RD-M1, and TE671 cell lines were used. The specific MEK/ERK inhibitor, U0126, reduced the clonogenic potential of the three cell lines, and was affected by radiation. U0126 inhibited phospho-active ERK1/2 and reduced DNA protein kinase catalytic subunit (DNA-PKcs) suggesting that ERKs and DNA-PKcs cooperate in radioprotection of rhabdomyosarcoma cells. The TE671 cell line xenotransplanted in mice showed a reduction in tumor mass and increase in the time of tumor progression with U0126 treatment associated with reduced DNA-PKcs, an effect enhanced by radiotherapy. Thus, our results show that MEK/ERK inhibition enhances radiosensitivity of rhabdomyosarcoma cells suggesting a rational approach in combination with radiotherapy. Mol Cancer Ther; 10(1); 159–68. ©2011 AACR. |
| Databáze: | OpenAIRE |
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