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Originally published In Press as doi:10.1074/jbc.M005220200 on September 12, 2000
J. Biol. Chem., Vol. 275, Issue 49, 38524-38531, December 8, 2000
EGR1 Target Genes in Prostate Carcinoma Cells Identified by
Microarray Analysis*
John
Svaren §,
Torsten
Ehrig ,
Sarki A.
Abdulkadir ¶,
Markus U.
Ehrengruber **,
Mark A.
Watson , and
Jeffrey
Milbrandt 
From the Departments of Pathology and Internal
Medicine, Division of Laboratory Medicine, Washington University
School of Medicine, St. Louis, Missouri 63110 and the Brain
Research Institute, University of Zurich,
Zurich CH-8057, Switzerland
The EGR1 transactivator is overexpressed in
prostate cancer, and its expression pattern suggests that EGR1 could
potentially regulate a number of steps involved in initiation and
progression of prostate cancer, such as mitogenesis, invasiveness,
angiogenesis, and metastasis. To identify potential EGR1 target genes
in an unbiased manner, we have utilized adenovirus-mediated expression of EGR1 in a prostate cancer cell line to identify specific genes that
are induced by EGR1. Using oligonucleotide arrays, a number of
EGR1-regulated genes were identified and their regulation was confirmed
by quantitative reverse transcription-polymerase chain reaction
analysis. One of the largest gene classes identified in this screen
includes several neuroendocrine-associated genes (neuron-specific
enolase, neurogranin), suggesting that EGR1 overexpression may
contribute to the neuroendocrine differentiation that often accompanies
prostate cancer progression. This screen also identified several growth
factors such as insulin-like growth factor-II, platelet-derived growth
factor-A, and transforming growth factor- 1, which have previously
been implicated in enhancing tumor progression. The insulin-like growth
factor-II gene lies within the 11p15.5 chromosomal locus, which
contains a number of other imprinted genes, and EGR1 expression was
found to induce at least two other genes in this locus (IPL,
p57KIP2). Based on our results, coupling adenoviral
overexpression with microarray and quantitative reverse
transcription-polymerase chain reaction analyses could be a versatile
strategy for identifying target genes of transactivators.
*
This work was supported in part by National Institutes of
Health Grant 5 P01 CA49712-08 and grants from the Association for the
Cure of Cancer of the Prostate (CaP CURE) and from the Monsanto Corp.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.
§
Present address: Dept. of Comparative Biosciences, School of
Veterinary Medicine, University of Wisconsin, Madison, WI 53706.
¶
Supported by National Institutes of Health Training Grant 5 T32 CA 09547-13.
**
Supported by Swiss National Science Foundation Grant
31-57/125.99).

To whom correspondence should be addressed: Depts. of Pathology
and Internal Medicine, Div. of Laboratory Medicine, Washington University School of Medicine, 660 S. Euclid Ave., St. Louis, MO 63110. Tel.: 314-362-4650; Fax: 314-362-8756; E-mail:
jeff@pathbox.wustl.edu.
Copyright © 2000 by The American Society for Biochemistry and Molecular Biology, Inc.

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Copyright © 2000 by the American Society for Biochemistry and Molecular Biology.
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