Document Detail

Crosstalk between MYCN and MDM2-p53 signal pathways regulates tumor cell growth and apoptosis in neuroblastoma.
MedLine Citation:
PMID:  21862876     Owner:  NLM     Status:  MEDLINE    
Previous studies show that the MYCN and MDM2-p53 signal pathways are mutually regulated: MYCN stimulates MDM2 and p53 transcription, whereas MDM2 stabilizes MYCN mRNA and induces its translation. Herein, we report that the interaction between MDM2 and MYCN plays a critical role in MYCN-amplified neuroblastoma tumor cell growth and survival. Distinct from the known role that MDM2 has in regulating tumor promotion in non-MYCN-amplified neuroblastoma, in which MDM2 inhibits p53, we found that MDM2 stimulated tumor growth in MYCN-amplified neuroblastoma in a p53-independent manner. In MYCN-amplified neuroblastoma cells, enforced expression of MDM2 further enhanced MYCN expression, yet no p53 inhibition was observed by MDM2 due to upregulation of MYCN that stimulated p53 transcription. Similarly, p53 expression remained unchanged in MDM2-silenced MYCN-amplified neuroblastoma cells because MDM2 inhibition resulted in a downregulation of MYCN that decreased p53 transcription, although the MDM2-mediated degradation of p53 was reduced. Also, we found that the enforced overexpression of MDM2, or conversely, the inhibition of overexpressed endogenous MDM2, led to either a remarkable increase or decrease in tumor growth, respectively, in MYCN-amplified neuroblastoma (even though no p53 function was involved). These results suggest that p53 that is reciprocally regulated by MDM2 and MYCN is dispensable for suppression of MYCN-amplified neuroblastoma, and that the direct interaction between MDM2 and MYCN may contribute significantly to MYCN-amplified neuroblastoma growth and disease progression.
Jing He; Lubing Gu; Hailong Zhang; Muxiang Zhou
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Publication Detail:
Type:  Journal Article; Research Support, N.I.H., Extramural; Research Support, Non-U.S. Gov't     Date:  2011-09-01
Journal Detail:
Title:  Cell cycle (Georgetown, Tex.)     Volume:  10     ISSN:  1551-4005     ISO Abbreviation:  Cell Cycle     Publication Date:  2011 Sep 
Date Detail:
Created Date:  2011-10-03     Completed Date:  2012-03-19     Revised Date:  2014-10-06    
Medline Journal Info:
Nlm Unique ID:  101137841     Medline TA:  Cell Cycle     Country:  United States    
Other Details:
Languages:  eng     Pagination:  2994-3002     Citation Subset:  IM    
Copyright Information:
© 2011 Landes Bioscience
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MeSH Terms
Cell Proliferation
Cycloheximide / pharmacology
Gene Expression Regulation, Neoplastic
Gene Knockdown Techniques
Neuroblastoma / genetics,  metabolism,  pathology*
Nuclear Proteins / genetics,  metabolism*
Oncogene Proteins / genetics,  metabolism*
Proto-Oncogene Proteins c-mdm2 / genetics,  metabolism*
RNA, Small Interfering / genetics,  metabolism
Signal Transduction*
Tumor Suppressor Protein p53 / genetics,  metabolism*
Grant Support
R01 CA123490/CA/NCI NIH HHS; R01 CA123490/CA/NCI NIH HHS; R01 CA143107/CA/NCI NIH HHS
Reg. No./Substance:
0/MYCN protein, human; 0/Nuclear Proteins; 0/Oncogene Proteins; 0/RNA, Small Interfering; 0/TP53 protein, human; 0/Tumor Suppressor Protein p53; 98600C0908/Cycloheximide; EC protein, human; EC Proteins c-mdm2

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