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Cezanne (OTUD7B) regulates HIF-1? homeostasis in a proteasome-independent manner.


ABSTRACT: The transcription factor HIF-1? is essential for cells to rapidly adapt to low oxygen levels (hypoxia). HIF-1? is frequently deregulated in cancer and correlates with poor patient prognosis. Here, we demonstrate that the deubiquitinase Cezanne regulates HIF-1? homeostasis. Loss of Cezanne decreases HIF-1? target gene expression due to a reduction in HIF-1? protein levels. Surprisingly, although the Cezanne-regulated degradation of HIF-1? depends on the tumour suppressor pVHL, hydroxylase and proteasome activity are dispensable. Our data suggest that Cezanne is essential for HIF-1? protein stability and that loss of Cezanne stimulates HIF-1? degradation via proteasome-independent routes, possibly through chaperone-mediated autophagy.

SUBMITTER: Bremm A 

PROVIDER: S-EPMC4264929 | biostudies-literature | 2014 Dec

REPOSITORIES: biostudies-literature

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Cezanne (OTUD7B) regulates HIF-1α homeostasis in a proteasome-independent manner.

Bremm Anja A   Moniz Sonia S   Mader Julia J   Rocha Sonia S   Komander David D  

EMBO reports 20141029 12


The transcription factor HIF-1α is essential for cells to rapidly adapt to low oxygen levels (hypoxia). HIF-1α is frequently deregulated in cancer and correlates with poor patient prognosis. Here, we demonstrate that the deubiquitinase Cezanne regulates HIF-1α homeostasis. Loss of Cezanne decreases HIF-1α target gene expression due to a reduction in HIF-1α protein levels. Surprisingly, although the Cezanne-regulated degradation of HIF-1α depends on the tumour suppressor pVHL, hydroxylase and pro  ...[more]

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