Hypoxia-inducible factor-1 target genes as indicators of tumor vessel response to vascular endothelial growth factor inhibition

Duyen T. Dang, Sang Y. Chun, Kyunghee Burkitt, Masako Abe, Shaowei Chen, Pamela Havre, Nicola J. Mabjeesh, Elisabeth I. Heath, Nicholas J. Vogelzang, Marcia Cruz-Correa, Douglas W. Blayney, William D. Ensminger, Brad St. Croix, Nam H. Dang, Long H. Dang

Research output: Contribution to journalArticlepeer-review

Abstract

Antiangiogenic therapy improves survival in patients with advanced stage cancers. Currently, there are no reliable predictors or markers for tumor vessel response to antiangiogenic therapy. To model effective antiangiogenic therapy, we disrupted the VEGF gene in three representative cancer cell lines. HCT116 xenografts had low proportions of endothelial tubes covered by pericytes that stained with α-smooth muscle actin (SMA) antibody. Upon disruption of VEGF, HCT116VEGF-/- xenografts had significantly decreased tumor microvessel perfusion compared with their parental counter-parts. Furthermore, HCT116VEGF-/- xenografts mounted a tumor-reactive response to hypoxia, characterized by the induction of hypoxia-inducible factor-1 (HIF-1) target genes. One highly induced protein was DPP4, a measurable serum protein that has well-described roles in cancer progression. In contrast, LS174T and MKN45 tumor xenografts had high proportion of endothelial tubes that were covered by SMA+ pericytes. Upon disruption of VEGF, LS174TVEGF-/- and MKN45VEGF-/- xenografts maintained tumor microvessel perfusion. As such, there were no changes in intratumoral hypoxia or HIF-1α induction. Together, these data show that the extent of tumor vessel response to angiogenic inhibition could be correlated with (a) the preexisting coverage of tumor endothelial tubes with SMA+ pericytes and (b) differential tumor induction of HIF-1 target genes. The data further show that DPP4 is a novel marker of HIF-1 induction. Altogether, these preclinical findings suggest novel clinical trials for predicting and monitoring tumor vessel responses to antiangiogenic therapy.

Original languageEnglish (US)
Pages (from-to)1872-1880
Number of pages9
JournalCancer Research
Volume68
Issue number6
DOIs
StatePublished - Mar 15 2008
Externally publishedYes

ASJC Scopus subject areas

  • Cancer Research
  • Oncology

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