Journal article
Adhesion of flowing monocytes to hypoxia-reoxygenation-exposed endothelial cells: role of Rac1, ROS, and VCAM-1
American Journal of Physiology: Cell Physiology, Vol.283(1), pp.C93-102
07/2002
DOI: 10.1152/ajpcell.00301.2001
PMID: 12055077
Abstract
Production of reactive oxygen species (ROS) by ischemic tissue after ischemia-reperfusion (I/RP) is an important factor that contributes to tissue injury. The small GTPase Rac1 mediates the oxidative burst, and ROS act on signaling pathways involved in expression of inflammatory genes. Because there is evidence implicating monocytes in the pathogenesis of I/RP injury, our objective was to determine the molecular mechanisms that regulate adhesive interactions between monocytes and hypoxia-reoxygenation (H/RO)-exposed cultured endothelial cells (ECs). When U937 cells were perfused over human umbilical vein ECs at 1 dyn/cm2, H (1 h at 1% O2)/RO (13 h) significantly increased the fluxes of rolling and stably adherent U937 cells. Either EC treatment with the antioxidant pyrrolidine dithiocarbamate (PDTC) or infection with AdRac1N17, which results in expression of the dominant-negative form of Rac1, abolished H/RO-induced ROS production, attenuated rolling, and abolished stable adhesion of U937 cells to H/RO-exposed ECs. Infection with AdRac1N17 also abolished H/RO-induced upregulation of vascular cell adhesion molecule (VCAM)-1. In turn, blocking VCAM-1 abolished U937 cell stable adhesion and slightly increased rolling. We concluded that the Rac1-dependent ROS partially regulate rolling and exclusively regulate stable adhesion of monocytic cells to ECs after H/RO and that stable adhesion, but not rolling, is mediated by ROS-induced expression of VCAM-1.
Details
- Title: Subtitle
- Adhesion of flowing monocytes to hypoxia-reoxygenation-exposed endothelial cells: role of Rac1, ROS, and VCAM-1
- Creators
- C K Domingos Ng - Vascular Bioengineering Laboratory, Department of Biomedical Engineering, Johns Hopkins University School of Medicine, Baltimore, Maryland 21205, USAShailesh S DeshpandeKaikobad IraniB Rita Alevriadou
- Resource Type
- Journal article
- Publication Details
- American Journal of Physiology: Cell Physiology, Vol.283(1), pp.C93-102
- Publisher
- United States
- DOI
- 10.1152/ajpcell.00301.2001
- PMID
- 12055077
- ISSN
- 0363-6143
- eISSN
- 1522-1563
- Grant note
- HL-54089 / NHLBI NIH HHS
- Language
- English
- Date published
- 07/2002
- Academic Unit
- Cardiovascular Medicine; Radiation Oncology; Fraternal Order of Eagles Diabetes Research Center; Internal Medicine
- Record Identifier
- 9984047709002771
Metrics
24 Record Views