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- W2148752404 abstract "ROS (reactive oxygen species) overproduction is an important underlying factor for the activation of astrocytes in various neuropathological conditions. In the present study, we examined ROS production in astrocytes and downstream effects leading to changes in the signalling cascade, morphology and membrane dynamics using menadione, a redox-active compound capable of inducing intracellular ROS. NAD(P)H oxidase-mediated menadione-induced ROS production, which then stimulated phosphorylation of p38 MAPK (mitogen-activated protein kinase) and ERK1/2 (extracellular-signal-regulated kinase 1/2), and increased actin polymerization and cytoskeletal protrusions. We also showed that astrocyte plasma membranes became more molecularly ordered under oxidative stress, which was abrogated by down-regulating cPLA2 (cytosolic phospholipase A2) either with a pharmacological inhibitor or by RNA interference. In addition, mild disruption of F-actin with cytochalasin D suppressed menadione-enhanced phosphorylation of cPLA2 and membrane alterations. Taken together, these results suggest an important role for ROS derived from NAD(P)H oxidase in activation of astrocytes to elicit biochemical, morphological and biophysical changes reminiscent of reactive astrocytes in pathological conditions." @default.
- W2148752404 created "2016-06-24" @default.
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- W2148752404 date "2009-06-26" @default.
- W2148752404 modified "2023-09-28" @default.
- W2148752404 title "NAD(P)H oxidase-mediated reactive oxygen species production alters astrocyte membrane molecular order via phospholipase A2" @default.
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- W2148752404 doi "https://doi.org/10.1042/bj20090356" @default.
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