title: EGR1 target genes in prostate carcinoma cells identified by microarray analysis.
abstract: 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-beta1, 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, p57(KIP2)). 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.
authors.affiliation: Departments of Pathology and Internal Medicine, Division of Laboratory Medicine, Washington University School of Medicine, St. Louis, Missouri 63110, USA.
authors.forename: J
authors.initials: J
authors.lastname: Svaren
authors.forename: T
authors.initials: T
authors.lastname: Ehrig
authors.forename: S A
authors.initials: SA
authors.lastname: Abdulkadir
authors.forename: M U
authors.initials: MU
authors.lastname: Ehrengruber
authors.forename: M A
authors.initials: MA
authors.lastname: Watson
authors.forename: J
authors.initials: J
authors.lastname: Milbrandt
mesh_terms: D000483:Alleles; D019943:Amino Acid Substitution; D004268:DNA-Binding Proteins / Q000235:genetics / Q000378:metabolism*; D051766:Early Growth Response Protein 1; D004798:Enzymes / Q000235:genetics; D015972:Gene Expression Regulation, Neoplastic; D006801:Humans; D017874:Immediate-Early Proteins / Q000378:metabolism; D007335:Insulin-Like Growth Factor II / Q000235:genetics*; D008297:Male; D020411:Oligonucleotide Array Sequence Analysis; D011471:Prostatic Neoplasms / Q000235:genetics*; D011506:Proteins / Q000235:genetics; D011994:Recombinant Proteins / Q000378:metabolism; D020133:Reverse Transcriptase Polymerase Chain Reaction; D014157:Transcription Factors / Q000235:genetics / Q000378:metabolism*; D014162:Transfection; D014407:Tumor Cells, Cultured
chemical_list: D004268:DNA-Binding Proteins; C497325:EGR1 protein, human; D051766:Early Growth Response Protein 1; D004798:Enzymes; D017874:Immediate-Early Proteins; D011506:Proteins; D011994:Recombinant Proteins; D014157:Transcription Factors; D007335:Insulin-Like Growth Factor II