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DOI: 10.1160/TH13-11-0923
PECAM-1-dependent heme oxygenase-1 regulation via an Nrf2-mediated pathway in endothelial cells
Financial support: This work was supported by grants from the Deutsche Forschungsgemeinschaft [SFB547-A8 to SS and SI], the German Federal Ministry of Education and Research [Reference numbers 01E01302 to SI and ETB-0316045B to SI] and the Else Kröner- Fresenius Stiftung (EKFS 2012_A309).Publication History
Received:
11 November 2013
Accepted after minor revision:
07 January 2014
Publication Date:
02 December 2017 (online)
Summary
The antioxidant enzyme heme oxygenase (HO)-1, which catalyses the first and rate-limiting step of heme degradation, has major anti-inflammatory and immunomodulatory effects via its cell-type-specific functions in the endothelium. In the current study, we investigated whether the key endothelial adhesion and signalling receptor PECAM-1 (CD31) might be involved in the regulation of HO-1 gene expression in human endothelial cells (ECs). To this end PECAM-1 expression was down-regulated in human umbilical vein ECs (HUVECs) by an adenoviral vector-based knockdown approach. PECAM-1 knockdown markedly induced HO-1, but not the constitutive HO isoform HO-2. Nuclear translocation of the transcription factor NF-E2-related factor-2 (Nrf2), which is a master regulator of the inducible antioxidant cell response, and intracellular levels of reactive oxygen species (ROS) were increased in PECAM-1-deficient HUVECs, respectively. PECAM-1-dependent HO-1 regulation was also examined in PECAM-1 over-expressing Chinese hamster ovary and murine L-cells. Endogenous HO-1 gene expression and reporter gene activity of transiently transfected luciferase HO-1 promoter constructs with Nrf2 target sequences were decreased in PECAM-1 over-expressing cells. Moreover, a regulatory role of ROS for HO-1 regulation in these cells is demonstrated by studies with the antioxidant N-acetylcysteine and exogenous hydrogenperoxide. Finally, direct interaction of PECAM-1 with a native complex of its binding partner NB1 (CD177) and serine proteinase 3 (PR3) from human neutrophils, markedly induced HO-1 expression in HUVECs. Taken together, we demonstrate a functional link between HO-1 gene expression and PECAM-1 in human ECs, which might play a critical role in the regulation of inflammation.
Keywords
Heme oxygenase-1 - redox signalling - inflammation - endothelial cells - signal transduction* Equal contribution of these authors.
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