Up-regulation of vascular endothelial growth factor expression in a rat glioma is conferred by two distinct hypoxia-driven mechanisms

Annette Damert, Marcia Machein, Georg Breier, Masaki Q Fujita, Douglas Hanahan, Werner Risau, Karl H. Plate

Research output: Contribution to journalArticle

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Abstract

Up-regulation of vascular endothelial growth factor (VEGF) expression is a major event leading to neovascularization in malignant gliomas. Hypoxia is believed to be the crucial environmental stimulus for this up-regulation. To critically assess this hypothesis, we asked whether the mechanisms defined previously for hypoxia-induced VEGF expression in vitro are similarly involved and sufficient for up-regulation of VEGF gene expression in vivo, using a lacZ reporter gene under the control of VEGF regulatory sequences in an experimental glioma model. Inclusion of the binding site for hypoxia- inducible factor 1 (HIF 1) in the 5' regulatory sequences used in the hybrid gene produced weak β-galactosidase staining in a special tumor cell subtype, the so-called perinecrotic palisading (PNP) cells that flank necrotic regions within the tumor. Deletion of the HIF 1 binding site abolished reporter gene expression in the PNP cells, indicating that transcriptional activation of VEGF expression in gliomas is mediated by HIF 1. Inclusion of 3' untranslated sequences from the VEGF gene in the reporter constructs resulted in an increased β-galactosidase staining in the PNP cells, suggesting that mRNA stabilization also contributes to VEGF up-regulation in glioblastoma cells growing as solid tumors. Combination of the 5' flanking region including the HIF 1 site along with 3' untranslated sequences produced increased levels of β-galactosidase expression in PNP cells. EF 5 immunostaining for regions of low oxygen partial pressure covered the same PNP cells that were stained for β-galactosidase. Collectively, the data provide experimental evidence that VEGF gene expression is activated in a distinct tumor cell subpopulation, the perinecrotic palisading cells of gliomas, by two distinct hypoxia-driven regulatory mechanisms.

Original languageEnglish
Pages (from-to)3860-3864
Number of pages5
JournalCancer Research
Volume57
Issue number17
Publication statusPublished - 1997 Sep 1
Externally publishedYes

Fingerprint

Glioma
Vascular Endothelial Growth Factor A
Up-Regulation
Galactosidases
Hypoxia-Inducible Factor 1
Reporter Genes
Gene Expression
Neoplasms
Binding Sites
Staining and Labeling
Hypoxia
Lac Operon
Partial Pressure
5' Flanking Region
Glioblastoma
Transcriptional Activation
Theoretical Models
Oxygen
Messenger RNA
Genes

ASJC Scopus subject areas

  • Cancer Research
  • Oncology

Cite this

Up-regulation of vascular endothelial growth factor expression in a rat glioma is conferred by two distinct hypoxia-driven mechanisms. / Damert, Annette; Machein, Marcia; Breier, Georg; Fujita, Masaki Q; Hanahan, Douglas; Risau, Werner; Plate, Karl H.

In: Cancer Research, Vol. 57, No. 17, 01.09.1997, p. 3860-3864.

Research output: Contribution to journalArticle

Damert, A, Machein, M, Breier, G, Fujita, MQ, Hanahan, D, Risau, W & Plate, KH 1997, 'Up-regulation of vascular endothelial growth factor expression in a rat glioma is conferred by two distinct hypoxia-driven mechanisms', Cancer Research, vol. 57, no. 17, pp. 3860-3864.
Damert, Annette ; Machein, Marcia ; Breier, Georg ; Fujita, Masaki Q ; Hanahan, Douglas ; Risau, Werner ; Plate, Karl H. / Up-regulation of vascular endothelial growth factor expression in a rat glioma is conferred by two distinct hypoxia-driven mechanisms. In: Cancer Research. 1997 ; Vol. 57, No. 17. pp. 3860-3864.
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