Investigating hypoxic tumor physiology through gene expression patterns

Nicholas C. Denko, Lucrezia A. Fontana, Karen M. Hudson, Patrick D. Sutphin, Soumya Raychaudhuri, Russ Altman, Amato J. Giaccia

Research output: Contribution to journalReview article

246 Scopus citations

Abstract

Clinical evidence shows that tumor hypoxia is an independent prognostic indicator of poor patient outcome. Hypoxic tumors have altered physiologic processes, including increased regions of angiogenesis, increased local invasion, increased distant metastasis and altered apoptotic programs. Since hypoxia is a potent controller of gene expression, identifying hypoxia-regulated genes is a means to investigate the molecular response to hypoxic stress. Traditional experimental approaches have identified physiologic changes in hypoxic cells. Recent studies have identified hypoxia-responsive genes that may define the mechanism(s) underlying these physiologic changes. For example, the regulation of glycolytic genes by hypoxia can explain some characteristics of the Warburg effect. The converse of this logic is also true. By identifying new classes of hypoxia-regulated gene(s), we can infer the physiologic pressures that require the induction of these genes and their protein products. Furthermore, these physiologically driven hypoxic gene expression changes give us insight as to the poor outcome of patients with hypoxic tumors. Approximately 1-1.5% of the genome is transcriptionally responsive to hypoxia. However, there is significant heterogeneity in the transcriptional response to hypoxia between different cell types. Moreover, the coordinated change in the expression of families of genes supports the model of physiologic pressure leading to expression changes. Understanding the evolutionary pressure to develop a 'hypoxic response' provides a framework to investigate the biology of the hypoxic tumor microenvironment.

Original languageEnglish (US)
Pages (from-to)5907-5914
Number of pages8
JournalOncogene
Volume22
Issue number37 REV. ISS. 3
DOIs
StatePublished - Sep 1 2003

Keywords

  • HIF-1
  • Hypoxic gene induction
  • VHL

ASJC Scopus subject areas

  • Molecular Biology
  • Genetics
  • Cancer Research

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    Denko, N. C., Fontana, L. A., Hudson, K. M., Sutphin, P. D., Raychaudhuri, S., Altman, R., & Giaccia, A. J. (2003). Investigating hypoxic tumor physiology through gene expression patterns. Oncogene, 22(37 REV. ISS. 3), 5907-5914. https://doi.org/10.1038/sj.onc.1206703