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      HIF-1 alpha is required for solid tumor formation and embryonic vascularization.

      1 , ,
      The EMBO journal
      Oxford University Press (OUP)

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          Abstract

          The transcriptional response to lowered oxygen levels is mediated by the hypoxia-inducible transcription factor (HIF-1), a heterodimer consisting of the constitutively expressed aryl hydrocarbon receptor nuclear translocator (ARNT) and the hypoxic response factor HIF-1alpha. To study the role of the transcriptional hypoxic response in vivo we have targeted the murine HIF-1alpha gene. Loss of HIF-1alpha in embryonic stem (ES) cells dramatically retards solid tumor growth; this is correlated with a reduced capacity to release the angiogenic factor vascular endothelial growth factor (VEGF) during hypoxia. HIF-1alpha null mutant embryos exhibit clear morphological differences by embryonic day (E) 8.0, and by E8.5 there is a complete lack of cephalic vascularization, a reduction in the number of somites, abnormal neural fold formation and a greatly increased degree of hypoxia (measured by the nitroimidazole EF5). These data demonstrate the essential role of HIF-1alpha in controlling both embryonic and tumorigenic responses to variations in microenvironmental oxygenation.

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          Author and article information

          Journal
          EMBO J
          The EMBO journal
          Oxford University Press (OUP)
          0261-4189
          0261-4189
          Jun 01 1998
          : 17
          : 11
          Affiliations
          [1 ] Department of Biology, University of California, San Diego, La Jolla, CA 92093-0366, USA.
          Article
          10.1093/emboj/17.11.3005
          1170640
          9606183
          8ec2c250-82cf-4457-98e5-69234efee931
          History

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