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The acetate/ACSS2 switch regulates HIF-2 stress signaling in the tumor cell microenvironment.


ABSTRACT: Optimal stress signaling by Hypoxia Inducible Factor 2 (HIF-2) during low oxygen states or hypoxia requires coupled actions of a specific coactivator/lysine acetyltransferase, Creb binding protein (CBP), and a specific deacetylase, Sirtuin 1 (SIRT1). We recently reported that acetylation of HIF-2 by CBP also requires a specific acetyl CoA generator, acetate-dependent acetyl CoA synthetase 2 (ACSS2). In this study, we demonstrate that ACSS2/HIF-2 signaling is active not only during hypoxia, but also during glucose deprivation. Acetate levels increase during stress and coincide with maximal HIF-2? acetylation and CBP/HIF-2? complex formation. Exogenous acetate induces HIF-2? acetylation, CBP/HIF-2? complex formation, and HIF-2 signaling. ACSS2 and HIF-2 are required for maximal colony formation, proliferation, migration, and invasion during stress. Acetate also stimulates flank tumor growth and metastasis in mice in an ACSS2 and HIF-2 dependent manner. Thus, ACSS2/CBP/SIRT1/HIF-2 signaling links nutrient sensing and stress signaling with cancer growth and progression in mammals.

SUBMITTER: Chen R 

PROVIDER: S-EPMC4331492 | biostudies-literature | 2015

REPOSITORIES: biostudies-literature

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The acetate/ACSS2 switch regulates HIF-2 stress signaling in the tumor cell microenvironment.

Chen Rui R   Xu Min M   Nagati Jason S JS   Hogg Richard T RT   Das Alok A   Gerard Robert D RD   Garcia Joseph A JA  

PloS one 20150217 2


Optimal stress signaling by Hypoxia Inducible Factor 2 (HIF-2) during low oxygen states or hypoxia requires coupled actions of a specific coactivator/lysine acetyltransferase, Creb binding protein (CBP), and a specific deacetylase, Sirtuin 1 (SIRT1). We recently reported that acetylation of HIF-2 by CBP also requires a specific acetyl CoA generator, acetate-dependent acetyl CoA synthetase 2 (ACSS2). In this study, we demonstrate that ACSS2/HIF-2 signaling is active not only during hypoxia, but a  ...[more]

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