Increase of reactive oxygen species (ROS) in endothelial cells by shear flow and involvement of ROS in shear-induced c-fos expression

Journal of Cellular Physiology
H J HsiehD L Wang

Abstract

Intracellular reactive oxygen species (ROS) may participate in cellular responses to various stimuli including hemodynamic forces and act as signal transduction messengers. Human umbilical vein endothelial cells (ECs) were subjected to laminar shear flow with shear stress of 15, 25, or 40 dynes/cm2 in a parallel plate flow chamber to demonstrate the potential role of ROS in shear-induced cellular response. The use of 2',7'-dichlorofluorescin diacetate (DCFH-DA) to measure ROS levels in ECs indicated that shear flow for 15 minutes resulted in a 0.5- to 1.5-fold increase in intracellular ROS. The levels remained elevated under shear flow conditions for 2 hours when compared to unsheared controls. The shear-induced elevation of ROS was blocked by either antioxidant N-acetyl-cysteine (NAC) or catalase. An iron chelator, deferoxamine mesylate, also significantly reduced the ROS elevation. A similar inhibitory effect was seen with a hydroxyl radical (.OH) scavenger, 1,3-dimethyl-2-thiourea (DMTU), suggesting that hydrogen peroxide (H202), .OH, and possibly other ROS molecules in ECs were modulated by shear flow. Concomitantly, a 1.3-fold increase of decomposition of exogenously added H2O2 was observed in extracts from ECs sheared for...Continue Reading

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