Abstract
Overcoming the metabolic restrictions of hypoxia may allow the progression of lower-grade tumors to glioblastoma multiforme. Our findings of up-regulation of HIF-1α and its downstream targets VEGF, GLUT-1, and CAIX in higher-grade gliomas support this hypothesis. We compared the gene expression profiles of the U-251 malignant glioma cell line under normoxic and hypoxic conditions to discover future research targets. U-251 cells were grown to 75% confluence and exposed to either normoxic or hypoxic conditions for 24 h. RNA was extracted, amplified, and hybridized to a cDNA microarray chip containing ~8,800 universal cellular genes. A threefold increase in mRNA expression was used as a threshold value for differential expression. Identified genes were divided into cell cycle control, stress response, and “newly connected” genes. Hybridization identified 11 hypoxia-induced genes: 1 involved with cell cycle control (CCNG2), 6 in stress response (IGFBP3, SLC2A3, GSTT2, FOS, DDIT3, AKR1C3), and 2 newly connected genes (Depp, AKAP4). One stress-related gene (AKR1C3) encodes for an enzyme that synthesizes progesterone. Of newly connected genes, the gene decidual protein induced by progesterone (Depp) showed the highest expression (4.2-fold increase). Possible future targeting for “hypoxic” glioma cells includes the targets for the AP-1 transcription factor complex (FOS), as well as blockade of the enzyme AKR1C3 with nonsteroidal anti-inflammatory drugs. Possible functions of the highly expressed gene Depp include tumor vascularization. Future studies will focus on the hypothesis that Depp is up-regulated in an autocrine fashion by the AKR1C3 enzyme in U-251 glioma cells under hypoxic conditions.
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Acknowledgments
The authors thank Kristin Kraus, M.S., for her editorial assistance in preparing this manuscript, as well as Brett Milash, M.S., for his expertise in analyzing microarray data.
This work was supported in part by a grant from the American Association of Neurological Surgeons Neurosurgery Research and Education Foundation to Brian Ragel.
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Hidetoshi Kasuya, Tokyo
In this article the authors used hypoxic conditions in a commercially available malignant glioma cell line (U-251) and found 11 up-regulated genes by cDNA microarray analysis. They detected the up-regulated genes that are more than threefold differentially expressed by comparing a set of normoxic and hypoxic samples.
For future studies we are hoping for confirmation of these expression results by RT-PCR and also by checking the protein amount through Western blot. Furthermore, it would also be interesting to know whether these differentially expressed genes could be found in other cell lines under the same conditions.
Ultimately, gene expression results of the diverse clinical samples of glioblastoma multiforme and various other forms of glioma are the ones that may also play a crucial role in finding new therapeutic approaches.
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Ragel, B.T., Couldwell, W.T., Gillespie, D.L. et al. Identification of hypoxia-induced genes in a malignant glioma cell line (U-251) by cDNA microarray analysis. Neurosurg Rev 30, 181–187 (2007). https://doi.org/10.1007/s10143-007-0070-z
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DOI: https://doi.org/10.1007/s10143-007-0070-z