Journal
NEURO-ONCOLOGY
Volume 10, Issue 5, Pages 716-724Publisher
OXFORD UNIV PRESS INC
DOI: 10.1215/15228517-2008-038
Keywords
medulloblastoma; neuronatin; oncogene
Categories
Funding
- National Institutes of Health [NS052507]
- American Brain Tumor Association
- Virginia and D.K. Ludwig Fund for Cancer Research
- J. Sherman M.D. Research Professorship
- NATIONAL CANCER INSTITUTE [ZICBC010953] Funding Source: NIH RePORTER
- NATIONAL INSTITUTE OF NEUROLOGICAL DISORDERS AND STROKE [R01NS052507] Funding Source: NIH RePORTER
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Medulloblastoma (MB) is the most common pediatric brain cancer. Several important developmental pathways have been implicated in MB formation, but fewer therapeutic targets have been identified. To locate frequently overexpressed genes, we performed a comprehensive gene expression survey of MB. Our comparison of 20 primary tumors to normal cerebellum identified neuronatin (NNAT) as the most frequently overexpressed gene in our analysis. NNAT is a neural-specific developmental gene with alpha and beta splice forms. Functional evaluation revealed that RNA interference knockdown of NNAT causes a significant decrease in proliferation. Conversely, coexpression of both splice forms in NNAT-negative MB cell lines increased proliferation, caused a significant shift from G(1) to G(2)/M, and increased soft agar colony formation and size. When expressed individually, each NNAT splice form had much less effect on these in vitro oncogenic predictors. In an in vivo model, the coexpression of both splice forms conferred the ability of xenograft formation to human MB cells that do not normally form xenografts, whereas a control gene had no effect. Our findings suggest that the frequently observed overexpression of both NNAT splice forms in MB enhances growth in this cancer. Neuro-Oncology 10, 716-724, 2008 (Posted to Neuro-Oncology [serial online], Doc. 07-00234, August 13, 2008. URL http://neuro-oncology.dukejournals.org; DOI: 10.1215/15228517-2008-038)
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