Document Detail


Over-expression of miR-100 is responsible for the low-expression of ATM in the human glioma cell line: M059J.
MedLine Citation:
PMID:  20869334     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
M059J and M059K cells were isolated from different portions of the same human malignant glioma. M059J cells are more radiosensitive than M059K cells due to the absence of DNA-PKcs and low-expression of ATM. The mechanism concerning the absence of DNA-PKcs in M059J is due to the frameshift mutation in PRKDC (DNA-PKcs gene); however, the reason for the low-expression of ATM in M059J cells remains unclear. We showed here that the main reason for the lower ATM level in M059J cells was not related to the transcriptional regulation or protein degradation but was related to post-transcriptional regulation. Based on database information, we found that the 3'-untranslational region (UTR) of ATM contains a miR-100 binding site. By using an RNase protection assay and qRT-PCR, we identified that miR-100 is highly-expressed in M059J cells. We further demonstrated that miR-100 bound to the 3'-UTR of ATM. Knocking down miR-100 promotes ATM expression in M059J cells. Up-regulating miR-100 in M059K cells and other cancer cells reduces ATM expression and sensitizes these cells to ionizing radiation. These results indicate that ATM is a target of miR-100, elucidating that the low-expression of ATM in M059J cells is mainly due to the high expression of miR-100. These results also suggest that miR-100 could be a useful tool to target ATM and sensitize tumor cells to ionizing radiation.
Authors:
Wooi Loon Ng; Dan Yan; Xiangming Zhang; Yin-Yuan Mo; Ya Wang
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Publication Detail:
Type:  Journal Article; Research Support, N.I.H., Extramural; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  DNA repair     Volume:  9     ISSN:  1568-7856     ISO Abbreviation:  DNA Repair (Amst.)     Publication Date:  2010 Nov 
Date Detail:
Created Date:  2010-11-02     Completed Date:  2011-03-17     Revised Date:  2013-07-03    
Medline Journal Info:
Nlm Unique ID:  101139138     Medline TA:  DNA Repair (Amst)     Country:  Netherlands    
Other Details:
Languages:  eng     Pagination:  1170-5     Citation Subset:  IM    
Copyright Information:
Copyright © 2010 Elsevier B.V. All rights reserved.
Affiliation:
Department of Radiation Oncology, Emory University School of Medicine, Winship Cancer Institute of Emory University, Atlanta, GA 30322, USA.
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MeSH Terms
Descriptor/Qualifier:
Base Sequence
Cell Cycle Proteins / biosynthesis,  genetics*
Cell Death / genetics,  radiation effects
Cell Line, Tumor
DNA-Binding Proteins / biosynthesis,  deficiency,  genetics*
Gene Expression Regulation, Neoplastic*
Glioma / genetics,  pathology*
Humans
MicroRNAs / genetics*
Molecular Sequence Data
Protein Biosynthesis / genetics
Protein-Serine-Threonine Kinases / biosynthesis,  deficiency,  genetics*
Transcription, Genetic / genetics
Tumor Suppressor Proteins / biosynthesis,  deficiency,  genetics*
Grant Support
ID/Acronym/Agency:
GM80771/GM/NIGMS NIH HHS; R01 GM080771-01A2/GM/NIGMS NIH HHS; R01 GM080771-03S1/GM/NIGMS NIH HHS; R01 GM080771-04/GM/NIGMS NIH HHS
Chemical
Reg. No./Substance:
0/Cell Cycle Proteins; 0/DNA-Binding Proteins; 0/MIRN100 microRNA, human; 0/MicroRNAs; 0/Tumor Suppressor Proteins; EC 2.7.11.1/Protein-Serine-Threonine Kinases; EC 2.7.11.1/ataxia telangiectasia mutated protein
Comments/Corrections

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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