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J. Biol. Chem., Vol. 277, Issue 3, 1967-1973, January 18, 2002
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From the MYCN amplification and consequent
deregulated expression plays a crucial role in determining the clinical
behavior of neuroblastoma. Enhanced expression of MYCN
confers growth potential to neuroblastoma cells, and a direct link
between MYCN expression and the development of
neuroblastoma has been demonstrated in transgenic mice studies. Although the molecular pathways underlying the regulation of
MYCN have not been fully elucidated, post-transcriptional
mechanisms appear to be important. Previously, we reported that an
embryonic lethal abnormal vision-like (ELAV) protein binds with high
specificity to at least two AU-rich elements within the
MYCN 3'-untranslated region. In this study, we
characterized the ability of cis-acting elements within the
MYCN 3'-untranslated region to destabilize mRNA in
cells and examined the functional consequences of its interactions with
the ELAV protein HuD. We show that at least 4 cis-acting
elements within the MYCN 3'-untranslated region are able to
signal the degradation of stable heterologous mRNA. Ectopic overexpression of HuD dramatically inhibits RNA decay mediated by the
full-length MYCN 3'-untranslated region and
cis-acting destabilizing elements that harbor HuD binding
sites in vivo. HuD may contribute to the malignant
phenotype of neuroblastoma cells by stabilizing MYCN
mRNA, thereby enhancing steady-state levels of expression of this oncogene.
HuD, a Neuronal-specific RNA-binding Protein, Increases the
in Vivo Stability of MYCN RNA*
,
§,
,
,
¶,
, and
**
Department of Pediatrics and
The
Robert H. Lurie Comprehensive Cancer Center, Northwestern University
Medical School, Chicago, Illinois 60611
*
This work was supported by NCI, National Institutes of
Health (NIH) Grant CA74824, the Elise Anderson Neuroblastoma Research Fund, the Neuroblastoma Children's Cancer Society, gifts from Dennis
Drescher, and the Robert H. Lurie Comprehensive Cancer Center, NCI, NIH
Core Grant 5P30CA60553.The costs of publication of this
article were defrayed in part by the
payment of page charges. The article
must therefore be hereby marked
"advertisement" in accordance with 18 U.S.C. Section
1734 solely to indicate this fact.
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