MAPK signaling up-regulates the activity of hypoxia-inducible factors by its effects on p300

被引:302
作者
Sang, NL
Stiehl, DP
Bohensky, J
Leshchinsky, I
Srinivas, V
Caro, J
机构
[1] Thomas Jefferson Univ, Cardeza Fdn Hematol Res, Dept Med, Philadelphia, PA 19107 USA
[2] Thomas Jefferson Univ, Cardeza Fdn Hematol Res, Dept Physiol, Philadelphia, PA 19107 USA
[3] Thomas Jefferson Univ, Kimmel Canc Inst, Philadelphia, PA 19107 USA
关键词
D O I
10.1074/jbc.M209702200
中图分类号
Q5 [生物化学]; Q7 [分子生物学];
学科分类号
071010 ; 081704 ;
摘要
Hypoxia-inducible factors (HIF) are a family of heterodimeric transcriptional regulators that play pivotal roles in the regulation of cellular utilization of oxygen and glucose and are essential transcriptional regulators of angiogenesis in solid tumor and ischemic disorders. The transactivation activity of HIF complexes requires the recruitment of p300/CREB-binding protein (CBP) by HIF-1alpha and HIF-2alpha that undergo oxygen-dependent degradation. HIF activation in tumors is caused by several factors including mitogen-activated protein kinase (MAPK) signaling. Here we investigated the molecular basis for HIF activation by MAPK. We show that MAPK is required for the transactivation activity of HIF-1alpha. Furthermore, inhibition of MAPK disrupts the HIF-p300 interaction and suppresses the transactivation activity of p300. Overexpression of MEK1, an upstream MAPK activator, stimulates the transactivation of both p300 and HIF-1alpha. Interestingly, the C-terminal transactivation domain of HIF-1alpha is not a direct substrate of MAPK, and HIF-1alpha phosphorylation is not required for HIFCAD/p300 interaction. Taken together, our data suggest that MAPK signaling facilitates HIF activation through p300/CBP.
引用
收藏
页码:14013 / 14019
页数:7
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