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Tumor Biology |
Department of Neurosurgery (A.W., W.C.L.) and Graduate Program in Neuroscience (W.C.L.), University of Minnesota Medical School, Minneapolis, MN 55455, USA, and Department of Neurosurgery, First Clinical College of China Medical University, Shenyang, China (A.W.)
2 Address correspondence to Walter C. Low, Department of Neurosurgery, University of Minnesota Medical School, 2001 Sixth Street, SE, Minneapolis, MN 55455, USA (lowwalt{at}umn.edu).
Abstract
The interleukin 13 alpha 2 receptor (IL-13Ra2) has been shown to be expressed in most malignant glioblastoma cells. Recent studies suggest that IL-13Ra2 serves as a dominant negative inhibitor or a decoy receptor for IL-13. To investigate the transcriptional regulation of this receptor, we cloned and characterized the promoter for the human IL-13Ra2 gene. Our results demonstrate that this promoter contains three TATA boxes and one CCAAT site. Several putative transcriptional factor binding sites for nuclear factor of activated T cells 1, AP1 (c-JUN and c-FOS), AP2, GABP, OCT1, GATA3, PRE, and C-ETS1 were predicted in the promoter region. Using the secreted alkaline phosphate reporter gene assay, we investigated the functional activity of the human IL-13Ra2 promoter by transient transfection in glioma cell lines U118, U87, and T98, which differ in their expression of the human IL-13Ra2 protein. The different secreted alkaline phosphate activities among these 3 cell lines suggest that the expression of human IL-13Ra2 is regulated at the transcriptional level. Methylation analysis showed that expression of IL-13Ra2 may not be the result of methylation of the CpG dinucleotides in the promoter region of the gene. Deletion analysis identified a 64 base pair (bp) region that is necessary for human IL-13Ra2 promoter activity. This 64-bp sequence contains cis-elements for AP1, nuclear factor of activated T cells, and AP2. The possible role of AP1 in the regulation of human IL-13Ra2 promoter activity was suggested by in vitro mutagenesis and c-JUN N-terminal kinase inhibition analysis.
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