Document Detail

STAT5 regulates glioma cell invasion by pathways dependent and independent of STAT5 DNA binding.
MedLine Citation:
PMID:  20969921     Owner:  NLM     Status:  In-Process    
STAT5 activation in primary glioma was analyzed using antibody directed against phosphorylated STAT5 (pSTAT5), in all samples robust pSTAT5 immunostaining was detected, predominantly in the nucleus. We then used immunofluorescence, transcription factor binding assays and western blotting to study EGF-modulated STAT5 activation in the human U87 glioma cell line. EGF was found to upregulate pSTAT5 levels and enhances STAT5 DNA-binding activity. To address the role of STAT5 in glioma cell invasion, resting and EGF-treated U87 cells were treated with siRNA directed against STAT5 and the extent of glioma cell migration into a Matrigel matrix was monitored. EGF treatment markedly enhanced matrix invasion, and knockdown of STAT5 expression with siRNA significantly downregulated matrix invasion by both EGF-stimulated and resting glioma cells. However, transfection with a decoy oligonucleotide abolished transcriptional activation of a STAT5 target gene but failed to inhibit matrix invasion in resting U87 cells. By contrast, the decoy nucleotide abolished EGF enhancement of matrix invasion. STAT5 therefore promotes glioma cell invasion via at least two different pathways: a pathway dependent of STAT5 DNA binding, and a second pathway independent of STAT5 DNA binding.
Shouqiang Cao; Chao Wang; Qian Zheng; Ying Qiao; Ke Xu; Tao Jiang; Anhua Wu
Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2010-10-20
Journal Detail:
Title:  Neuroscience letters     Volume:  487     ISSN:  1872-7972     ISO Abbreviation:  Neurosci. Lett.     Publication Date:  2011 Jan 
Date Detail:
Created Date:  2010-12-20     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  7600130     Medline TA:  Neurosci Lett     Country:  Ireland    
Other Details:
Languages:  eng     Pagination:  228-33     Citation Subset:  IM    
Copyright Information:
Copyright © 2010 Elsevier Ireland Ltd. All rights reserved.
Department of Neurosurgery, First Hospital of China Medical University, Shenyang, People's Republic of China.
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