Peroxiredoxin II Is an Essential Antioxidant Enzyme that Prevents the Oxidative Inactivation of VEGF Receptor-2 in Vascular Endothelial Cells

Dong Hoon Kang, Doo Jae Lee, Kyung Wha Lee, Yoon Sun Park, Joo Young Lee, Sang Hee Lee, Young Jun Koh, Gou Young Koh, Chulhee Choi, Dae Yeul Yu, Jaesang Kim, Sang Won Kang

Research output: Contribution to journalArticlepeer-review

92 Scopus citations

Abstract

Cellular antioxidant enzymes play crucial roles in aerobic organisms by eliminating detrimental oxidants and maintaining the intracellular redox homeostasis. Therefore, the function of antioxidant enzymes is inextricably linked to the redox-dependent activities of multiple proteins and signaling pathways. Here, we report that the VEGFR2 RTK has an oxidation-sensitive cysteine residue whose reduced state is preserved specifically by peroxiredoxin II (PrxII) in vascular endothelial cells. In the absence of PrxII, the cellular H 2O 2 level is markedly increased and the VEGFR2 becomes inactive, no longer responding to VEGF stimulation. Such VEGFR2 inactivation is due to the formation of intramolecular disulfide linkage between Cys1199 and Cys1206 in the C-terminal tail. Interestingly, the PrxII-mediated VEGFR2 protection is achieved by association of two proteins in the caveolae. Furthermore, PrxII deficiency suppresses tumor angiogenesis in vivo. This study thus demonstrates a physiological function of PrxII as the residential antioxidant safeguard specific to the redox-sensitive VEGFR2.

Original languageEnglish
Pages (from-to)545-558
Number of pages14
JournalMolecular Cell
Volume44
Issue number4
DOIs
StatePublished - 18 Nov 2011

Fingerprint

Dive into the research topics of 'Peroxiredoxin II Is an Essential Antioxidant Enzyme that Prevents the Oxidative Inactivation of VEGF Receptor-2 in Vascular Endothelial Cells'. Together they form a unique fingerprint.

Cite this