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1.  12-LIPOXYGENASE AND THE REGULATION OF HYPOXIA-INDUCIBLE FACTOR IN PROSTATE CANCER CELLS 
Experimental cell research  2010;316(10):1706-1715.
12-lipoxygenase, an arachidonic acid metabolizing enzyme of the lipoxygenase pathway, has been implicated as a major factor in promoting prostate cancer progression and metastasis. The ability of 12-LOX to aggravate the disease was linked to its proangiogenic role. Recent studies clearly demonstrated that 12-LOX enhances the expression and secretion of the angiogenic factor, vascular endothelial growth factor (VEGF) thus providing a direct link between this enzyme and its angiogenic properties. In the present study we have investigated the relationship between 12-LOX and hypoxia inducible factor-1α (HIF-1α), a transcription factor involved in the regulation of VEGF expression under hypoxic conditions in solid tumors. Our findings have revealed that HIF-1 is one of the target transcription factors regulated by 12-LOX and 12(S)-HETE, in hypoxic tumor cells of the prostate. Regulation of HIF-1α by 12-LOX adds to the complexity of pathways mediated by this enzyme in promoting prostate cancer angiogenesis and metastasis. We have evidence that 12-LOX increases the protein level, mRNA, and functional activity of HIF-1α under hypoxic conditions, one of the mechanisms by which it upregulates VEGF secretion and activity.
doi:10.1016/j.yexcr.2010.03.005
PMCID: PMC3420817  PMID: 20303950
12-Lipoxygenase; Hypoxia Inducible Factor-1α (HIF-1α); angiogenesis; prostate cancer; hypoxia

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