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J. Biol. Chem., Vol. 277, Issue 8, 6183-6187, February 22, 2002
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From the Department of Anesthesiology/Physiology and the Cardeza
Foundation for Hematologic Research, Department of Medicine, Jefferson
Medical College of Thomas Jefferson University, Philadelphia,
Pennsylvania 19107
One of the key mediators of the hypoxic response
in animal cells is the hypoxia-inducible transcription factor-1 (HIF-1)
complex, in which the
-subunit is highly susceptible to
oxygen-dependent degradation. The hypoxic response is
manifested in many pathophysiological processes such as tumor growth
and metastasis. During hypoxia, cells shift to a primarily glycolytic
metabolic mode for their energetic needs. This is also manifested in
the HIF-1-dependent up-regulation of many glycolytic genes.
Paradoxically, tumor cells growing under conditions of normal oxygen
tension also show elevated glycolytic rates that correlate with the
increased expression of glycolytic enzymes and glucose transporters
(the Warburg effect). A key regulator of glycolytic flux is the
relatively recently discovered fructose-2,6-bisphosphate (F-2,6-P2), an
allosteric activator of 6-phosphofructo-1-kinase (PFK-1). Steady
state levels of F-2,6-P2 are maintained by the bifunctional enzyme
PFK-2/F2,6-Bpase, which has both kinase and phosphatase activities.
Herein, we show that one isozyme, PFKFB3, is highly induced by hypoxia
and the hypoxia mimics cobalt and desferrioxamine. This induction could be replicated by the use of an inhibitor of the prolyl hydroxylase enzymes responsible for the von Hippel Lindau
(VHL)-dependent destabilization and tagging of HIF-1
.
The absolute dependence of the PFKFB3 gene on HIF-1
was confirmed by its overexpression in VHL-deficient cells and by the
lack of hypoxic induction in mouse embryonic fibroblasts conditionally
nullizygous for HIF-1
.
To whom correspondence should be addressed: Cardeza
Foundation for Hematologic Research, 1015 Walnut St., Philadelphia, PA 19107-509. Tel.: 215-955-7775; Fax: 215-923-3836; E-mail:
Jaime.Caro@mail.tju.edu.
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