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BMC Cancer
Published in: BMC Cancer 1/2011

Open Access 01-12-2011 | Research article

MicroRNA-34a is a potent tumor suppressor molecule in vivo in neuroblastoma

Authors: Amanda Tivnan, Lorraine Tracey, Patrick G Buckley, Leah C Alcock, Andrew M Davidoff, Raymond L Stallings

Published in: BMC Cancer | Issue 1/2011

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ABSTRACT

Background

Neuroblastoma is a paediatric cancer which originates from precursor cells of the sympathetic nervous system and accounts for 15% of childhood cancer mortalities. With regards to the role of miRNAs in neuroblastoma, miR-34a, mapping to a chromosome 1p36 region that is commonly deleted, has been found to act as a tumor suppressor through targeting of numerous genes associated with cell proliferation and apoptosis.

Methods

A synthetic miR-34a (or negative control) precursor molecule was transfected into NB1691luc and SK-N-ASluc neuroblastoma cells. Quantitative PCR was used to verify increased miR-34a levels in NB1691luc and SK-N-ASluc cell lines prior to in vitro and in vivo analysis. In vitro analysis of the effects of miR-34a over expression on cell growth, cell cycle and phosphoprotein activation in signal transduction pathways was performed. Neuroblastoma cells over expressing miR-34a were injected retroperitoneally into immunocompromised CB17-SCID mice and tumor burden was assessed over a 21 day period by measuring bioluminescence (photons/sec/cm2).

Results

Over expression of miR-34a in both NB1691luc and SK-N-ASluc neuroblastoma cell lines led to a significant decrease in cell number relative to premiR-negative control treated cells over a 72 hour period. Flow cytometry results indicated that miR-34a induced cell cycle arrest and subsequent apoptosis activation. Phosphoprotein analysis highlighted key elements involved in signal transduction, whose activation was dysregulated as a result of miR-34a introduction into cells. As a potential mechanism of miR-34a action on phosphoprotein levels, we demonstrate that miR-34a over-expression results in a significant reduction of MAP3K9 mRNA and protein levels. Although MAP3K9 is a predicted target of miR-34a, direct targeting could not be validated with luciferase reporter assays. Despite this fact, any functional effects of reduced MAP3K9 expression as a result of miR-34a would be expected to be similar regardless of the mechanism involved. Most notably, in vivo studies showed that tumor growth was significantly repressed after exogenous miR-34a administration in retroperitoneal neuroblastoma tumors.

Conclusion

We demonstrate for the first time that miR-34a significantly reduces tumor growth in an in vivo orthotopic murine model of neuroblastoma and identified novel effects that miR-34a has on phospho-activation of key proteins involved with apoptosis.
Appendix
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Metadata
Title
MicroRNA-34a is a potent tumor suppressor molecule in vivo in neuroblastoma
Authors
Amanda Tivnan
Lorraine Tracey
Patrick G Buckley
Leah C Alcock
Andrew M Davidoff
Raymond L Stallings
Publication date
01-12-2011
Publisher
BioMed Central
Published in
BMC Cancer / Issue 1/2011
Electronic ISSN: 1471-2407
DOI
https://doi.org/10.1186/1471-2407-11-33

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