von Hippel Lindau tumor suppressor regulates hepatic glucose metabolism by controlling expression of glucose transporter 2 and glucose 6-phosphatase

  • Authors:
    • Sang-Ki Park
    • Volker H. Haase
    • Randall S. Johnson
  • View Affiliations

  • Published online on: February 1, 2007     https://doi.org/10.3892/ijo.30.2.341
  • Pages: 341-348
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Abstract

von Hippel Lindau (VHL) disease is a hereditary cancer syndrome caused by biallelic inactivation of the VHL tumor suppressor gene. The most widely known function of VHL is to limit normoxic protein expression of hypoxia-inducible factor-α (HIF-α). Loss of the functional VHL gene causes constitutive stabilization of HIF-α that primarily up-regulates hypoxia-inducible genes even at normal oxygen concentration, which in turn contribute to VHL tumor progression. We report on the novel function of VHL in hepatic glucose storage and disposal. VHL deletion in adult mouse liver quickly leads to increased accumulation of glycogen granules as well as lipid droplets. This abnormal glycogen storage in VHL-inactivated liver arises at least in part from significantly reduced expression of two key liver-specific glucose metabolism genes, glucose transporter-2 (GLUT2) and glucose-6-phosphatase (G-6-Pase). The expression pattern of these genes in VHL knock-out liver was in contrast to that of well-known HIF target genes, such as PGK, Glut-1, VEGF, and EPO, all of which are highly elevated upon VHL inactivation. Our findings suggest that two distinct signaling pathways exist at the downstream of VHL controlling different sets of gene expression. Following VHL inactivation, one pathway causes oxygen-independent overexpression of classic hypoxia-inducible genes and the other one described here suppresses expression of the genes important for liver glucose metabolism.

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February 2007
Volume 30 Issue 2

Print ISSN: 1019-6439
Online ISSN:1791-2423

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Spandidos Publications style
Park S, Haase VH and Johnson RS: von Hippel Lindau tumor suppressor regulates hepatic glucose metabolism by controlling expression of glucose transporter 2 and glucose 6-phosphatase. Int J Oncol 30: 341-348, 2007.
APA
Park, S., Haase, V.H., & Johnson, R.S. (2007). von Hippel Lindau tumor suppressor regulates hepatic glucose metabolism by controlling expression of glucose transporter 2 and glucose 6-phosphatase. International Journal of Oncology, 30, 341-348. https://doi.org/10.3892/ijo.30.2.341
MLA
Park, S., Haase, V. H., Johnson, R. S."von Hippel Lindau tumor suppressor regulates hepatic glucose metabolism by controlling expression of glucose transporter 2 and glucose 6-phosphatase". International Journal of Oncology 30.2 (2007): 341-348.
Chicago
Park, S., Haase, V. H., Johnson, R. S."von Hippel Lindau tumor suppressor regulates hepatic glucose metabolism by controlling expression of glucose transporter 2 and glucose 6-phosphatase". International Journal of Oncology 30, no. 2 (2007): 341-348. https://doi.org/10.3892/ijo.30.2.341