A positive feedback loop between ROS and Mxi1-0 promotes hypoxia-induced VEGF expression in human hepatocellular carcinoma cells.


Journal Article

VEGF expression induced by hypoxia plays a critical role in promoting tumor angiogenesis. However, the molecular mechanism that modulates VEGF expression under hypoxia is still poorly understood. In this study, we found that VEGF induction in hypoxic HepG2 cells is ROS-dependent. ROS mediates hypoxia-induced VEGF by upregulation of Mxi1-0. Furthermore, PI3K/AKT/HIF-1α signaling pathway is involved in ROS-mediated Mxi1-0 and VEGF expression in hypoxic HepG2 cells. Finally, Mxi1-0 could in turn regulate ROS generation in hypoxic HepG2 cells, creating a positive feedback loop. Taken together, this study demonstrate a positive regulatory feedback loop in which ROS mediates hypoxia-induced Mxi1-0 via activation of PI3K/AKT/HIF-1α pathway, events that in turn elevate ROS generation and promote hypoxia-induced VEGF expression. These findings could provide a rationale for designing new therapies based on inhibition of hepatocellular carcinoma (HCC) angiogenesis.

Full Text

Cited Authors

  • Hu, Z; Dong, N; Lu, D; Jiang, X; Xu, J; Wu, Z; Zheng, D; Wechsler, DS

Published Date

  • February 2017

Published In

Volume / Issue

  • 31 /

Start / End Page

  • 79 - 86

PubMed ID

  • 28065785

Pubmed Central ID

  • 28065785

Electronic International Standard Serial Number (EISSN)

  • 1873-3913

International Standard Serial Number (ISSN)

  • 1873-3913

Digital Object Identifier (DOI)

  • 10.1016/j.cellsig.2017.01.007


  • eng