Systematic name M12751
Brief description Genes down-regulated in DLD-1 cells (colon cancer) in response to hypoxia; might not be direct targets of HIF1A [GeneID=3091].
Full description or abstract Hypoxia inducible factor-1 (HIF-1) is considered a crucial mediator of the cellular response to hypoxia through its regulation of genes that control angiogenesis. It represents an attractive therapeutic target in colon cancer, one of the few tumor types that shows a clinical response to antiangiogenic therapy. But it is unclear whether inhibition of HIF-1 alone is sufficient to block tumor angiogenesis. In HIF-1alpha knockdown DLD-1 colon cancer cells (DLD-1(HIF-kd)), the hypoxic induction of vascular endothelial growth factor (VEGF) was only partially blocked. Xenografts remained highly vascularized with microvessel densities identical to DLD-1 tumors that had wild-type HIF-1alpha (DLD-1(HIF-wt)). In addition to the preserved expression of VEGF, the proangiogenic cytokine interleukin (IL)-8 was induced by hypoxia in DLD-1(HIF-kd) but not DLD-1(HIF-wt) cells. This induction was mediated by the production of hydrogen peroxide and subsequent activation of NF-kappaB. Furthermore, the KRAS oncogene, which is commonly mutated in colon cancer, enhanced the hypoxic induction of IL-8. A neutralizing antibody to IL-8 substantially inhibited angiogenesis and tumor growth in DLD-1(HIF-kd) but not DLD-1(HIF-wt) xenografts, verifying the functional significance of this IL-8 response. Thus, compensatory pathways can be activated to preserve the tumor angiogenic response, and strategies that inhibit HIF-1alpha may be most effective when IL-8 is simultaneously targeted.
Collection C2: curated gene sets
      CGP: chemical and genetic perturbations
Source publication Pubmed 16127434   Authors: Mizukami Y,Jo WS,Duerr EM,Gala M,Li J,Zhang X,Zimmer MA,Iliopoulos O,Zukerberg LR,Kohgo Y,Lynch MP,Rueda BR,Chung DC
Exact source Table 1S
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(show 454 gene sets from the same authors)
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Organism Homo sapiens
Contributed by Jessica Robertson (MSigDB Team)
Source platform AFFY_HG_U133
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