Differential response to radiation of TP53-inactivated cells by overexpression of dominant-negative mutant TP53 or HPVE6
| Autor: | Nicolaas A. P. Franken, C. van Bree, Jaap Haveman |
|---|---|
| Přispěvatelé: | Cancer Center Amsterdam, Radiotherapy |
| Jazyk: | angličtina |
| Rok vydání: | 2004 |
| Předmět: |
endocrine system diseases
Cell Survival Mutant Biophysics Repressor Endogeny Biology medicine.disease_cause Radiation Dosage medicine Gene silencing Chromosomes Human Humans Radiology Nuclear Medicine and imaging Gene Silencing Gene Metaphase neoplasms Chromosome Aberrations Mutation Radiation Dose-Response Relationship Radiation Transfection Oncogene Proteins Viral Molecular biology Recombinant Proteins Cell biology Gene Expression Regulation Neoplastic Repressor Proteins Tumor Suppressor Protein p53 Colorectal Neoplasms |
| Zdroj: | Radiation research, 161(5), 504-510. Radiation Research Society |
| ISSN: | 0033-7587 |
| DOI: | 10.1667/rr3160 |
| Popis: | The inactivation of TP53 by transfection of a dominant-negative mutated TP53 (MP53.13 cells) was compared with inactivation of TP53 by transfection with the HPV E6 gene (RC10.1 cells) with respect to PLD repair, G(1)-phase arrest, and induction of color junctions. Functional G, arrest was demonstrated in parental (RKO) cells with wild-type TP53, while in RC10.1 cells the G, arrest was eliminated. In MP53.13 cells an intermediate G, arrest was found. Functionality of endogenous TP53 was confirmed in RKO and MP53.13 cells by accumulation of TP53 protein and its downstream target CDKN1A (p2l). Radiation survival of MP53.13 cells was higher than that of RKO cells, and PLD repair was found in RKO cells and MP53.13 cells but not in RC10.1 cells. Both with and without irradiation, the number of color junctions was 50 to 80% higher in MP53.13 cells than in RKO and RC10.1 cells. In the MP53.13 cells, the genetic instability appears to lead to more aberrations and to radioresistance. In spite of the presence of an excess of mutated TP53, wildtype TP53 functions appear to be affected only partly or not at all. (C) 2004 by Radiation Research Society |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|