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Development and characterization of an isogenic cell line with a radioresistant phenotype.
MedLine Citation:
PMID:  22855182     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
INTRODUCTION: Radiation resistance is a major cause of death in cancer patients. Cancer cells react during radiotherapy by re-programming specific cell functions that may confer resistance to radiation. The understanding of this complex process is hindered due to the lack of appropriate study models. We describe an experimental development of a radioresistant isogenic cancer cell line, and its molecular characterization. MATERIALS AND METHODS: A431-cultured cells were irradiated for 7 month until 85 Gy. Then, a selected single cell was left to grow as stable A431-R cell line. Clonogenic assay was used to determine cell survival, the α and β parameters of the LQ model, and the mean inactivation dose. The DNA repair ability of cells was evaluated by pulsed-field electrophoresis method. Differential effect of fractionated radiation was ultimately tested in xenografts. Furthermore, we used a wound healing assay, Western blot for EGFR, AKT and ERK1/2 and ELISA test for vascular endothelial growth factor (VEGF) secretion. Finally we explored CD44 marker and cell cycle distribution. RESULTS: The established A431-R cell line showed radiation resistance in clonogenic assays, repair of radiation-induced DNA fragmentation and xenografted tumours. The radiation resistance was associated with in vitro higher cell growth and migration, increased levels of former oncoproteins, and secretion of VEGF. CONCLUSIONS: In this model, the emergence of radiation resistance was associated with the acquisition of biological traits that support more aggressive behaviour of cancer cells. We have generated a model that will be useful for mechanistic studies and development of rational treatments against radiation resistance in cancer.
Authors:
Lara I de Llobet; Marta Baro; Agnès Figueras; Ignasi Modolell; Maria V Da Silva; Purificación Muñoz; Arturo Navarro; Ricard Mesia; Josep Balart
Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2012-7-24
Journal Detail:
Title:  Clinical & translational oncology : official publication of the Federation of Spanish Oncology Societies and of the National Cancer Institute of Mexico     Volume:  -     ISSN:  1699-3055     ISO Abbreviation:  Clin Transl Oncol     Publication Date:  2012 Jul 
Date Detail:
Created Date:  2012-8-2     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  101247119     Medline TA:  Clin Transl Oncol     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Affiliation:
Translational Research Laboratory, Catalan Institute of Oncology - IDIBELL, Avda Gran Via de l'Hospitalet, 199-203, 08907, L'Hospitalet de Llobregat, Spain.
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